# SEDOLs

(Redirected from SEDOL)
SEDOLs
You are encouraged to solve this task according to the task description, using any language you may know.

For each number list of 6-digit SEDOLs, calculate and append the checksum digit.

That is, given this input:

```710889
B0YBKJ
406566
B0YBLH
228276
B0YBKL
557910
B0YBKR
585284
B0YBKT
B00030
```

Produce this output:

```7108899
B0YBKJ7
4065663
B0YBLH2
2282765
B0YBKL9
5579107
B0YBKR5
5852842
B0YBKT7
B000300
```
Extra credit

Check each input is correctly formed, especially with respect to valid characters allowed in a SEDOL string.

## 11l

Translation of: Python
```F char2value(c)
assert(c !C ‘AEIOU’, ‘No vowels’)

V sedolweight = [1, 3, 1, 7, 3, 9]

F checksum(sedol)
V tmp = sum(zip(sedol, :sedolweight).map((ch, weight) -> char2value(ch) * weight))
R String((10 - (tmp % 10)) % 10)

V sedols =
|‘710889
B0YBKJ
406566
B0YBLH
228276
B0YBKL
557910
B0YBKR
585284
B0YBKT’

L(sedol) sedols.split("\n")
print(sedol‘’checksum(sedol))```
Output:
```7108899
B0YBKJ7
4065663
B0YBLH2
2282765
B0YBKL9
5579107
B0YBKR5
5852842
B0YBKT7
```

## Action!

```INT FUNC SedolChecksum(CHAR ARRAY sedol)
BYTE ARRAY weights=[1 3 1 7 3 9]
INT i,sum
CHAR c

IF sedol(0)#6 THEN
RETURN (-1)
FI

sum=0
FOR i=1 TO sedol(0)
DO
c=sedol(i)
IF c>='0 AND c<='9 THEN
sum==+(c-'0)*weights(i-1)
ELSE
IF c>='a AND c<='z THEN
c==-'a-'A
FI
IF c='A OR c='E OR c='I OR c='O OR c='U THEN
RETURN (-1)
ELSEIF c>='A AND c<='Z THEN
sum==+(c-'A+10)*weights(i-1)
ELSE
RETURN (-1)
FI
FI
OD
sum=(10-(sum MOD 10)) MOD 10
RETURN (sum)

PROC Test(CHAR ARRAY sedol)
INT res

res=SedolChecksum(sedol)
Print(sedol) Print(" -> ")
IF res>=0 THEN
Print(sedol) PrintIE(res)
ELSE
PrintE("invalid input")
FI
RETURN

PROC Main()
Test("710889")
Test("B0YBKJ")
Test("406566")
Test("B0YBLH")
Test("228276")
Test("B0YBKL")
Test("557910")
Test("B0YBKR")
Test("585284")
Test("B0YBKT")
Test("B00030")
Test("12345A")
Test("12345")
Test("1234567")
RETURN```
Output:
```710889 -> 7108899
B0YBKJ -> B0YBKJ7
406566 -> 4065663
B0YBLH -> B0YBLH2
228276 -> 2282765
B0YBKL -> B0YBKL9
557910 -> 5579107
B0YBKR -> B0YBKR5
585284 -> 5852842
B0YBKT -> B0YBKT7
B00030 -> B000300
12345A -> invalid input
12345 -> invalid input
1234567 -> invalid input
```

## ActionScript

```//Return the code corresponding to a given character.
//ActionScript does not have a character type, so 1-digit strings
function toSEDOLCode(char:String):uint {
//Make sure only a single character was sent.
if(char.length != 1)
throw new Error("toSEDOL expected string length of 1, got " + char.length);
//Character is uppercase
if (char >= "A" && char <= "Z") {
return SEDOL.charCodeAt() + 10 - "A".charCodeAt();
}
//Character is numeric
else if (char >= "0" && char <= "9"){
return uint(char);
}
//Error: character is neither numeric nor uppercase
else{
throw new Error("toSEDOLCode expected numeric or uppercase character, recieved " + char);
}
}
//Calculate the weighted sum for the SEDOL.
function toSum(str:String):uint {
if(str.length != 6)
throw new Error("toSum expected length 6, recieved " + str.length);
var sum:uint=0;
for (var i:uint = 0; i < str.length; i++)
sum+=toSEDOLCode(str.charAt(i))*[1,3,1,7,3,9][i];
return sum;
}
//Calculate the check digit from the weighted sum.
function toCheck(num:int):uint
{
return (10 -(num % 10)) % 10;
}
//Print the SEDOL with the check digit added.
function printWithCheck(SEDOL:String):void
{
trace(SEDOL + toCheck(toSum(SEDOL)));
}
printWithCheck("710889");
printWithCheck("B0YBKJ");
printWithCheck("406566");
printWithCheck("B0YBLH");
printWithCheck("228276");
printWithCheck("B0YBKL");
printWithCheck("557910");
printWithCheck("B0YBKR");
printWithCheck("585284");
printWithCheck("B0YBKT");
printWithCheck("B00030");
```

```with Ada.Text_IO;  use Ada.Text_IO;

procedure Test_SEDOL is

subtype SEDOL_String is String (1..6);
type SEDOL_Sum is range 0..9;

function Check (SEDOL : SEDOL_String) return SEDOL_Sum is
Weight : constant array (SEDOL_String'Range) of Integer := (1,3,1,7,3,9);
Sum    : Integer := 0;
Item   : Integer;
begin
for Index in SEDOL'Range loop
Item := Character'Pos (SEDOL (Index));
case Item is
when Character'Pos ('0')..Character'Pos ('9') =>
Item := Item - Character'Pos ('0');
when Character'Pos ('B')..Character'Pos ('D') |
Character'Pos ('F')..Character'Pos ('H') |
Character'Pos ('J')..Character'Pos ('N') |
Character'Pos ('P')..Character'Pos ('T') |
Character'Pos ('V')..Character'Pos ('Z') =>
Item := Item - Character'Pos ('A') + 10;
when others =>
raise Constraint_Error;
end case;
Sum := Sum + Item * Weight (Index);
end loop;
return SEDOL_Sum ((-Sum) mod 10);
end Check;

Test : constant array (1..10) of SEDOL_String :=
(  "710889", "B0YBKJ", "406566", "B0YBLH", "228276",
"B0YBKL", "557910", "B0YBKR", "585284", "B0YBKT"
);
begin
for Index in Test'Range loop
Put_Line (Test (Index) & Character'Val (Character'Pos ('0') + Check (Test (Index))));
end loop;
end Test_SEDOL;
```

The function Check raises Constraint_Error upon an invalid input. The calculated sum is trimmed using (-sum) mod 10, which is mathematically equivalent to (10 - (sum mod 10)) mod 10.

Sample output:

```7108899
B0YBKJ7
4065663
B0YBLH2
2282765
B0YBKL9
5579107
B0YBKR5
5852842
B0YBKT7```

## ALGOL 68

Translation of: C
Works with: ALGOL 68G version Any - tested with release mk15-0.8b.fc9.i386 - char in string, is alpha, is digit and to upper are not in the standard's prelude
```[]INT sedol weights = (1, 3, 1, 7, 3, 9);
STRING reject = "AEIOUaeiou";

PROC strcspn = (STRING s,reject)INT: (
INT out:=0;
FOR i TO UPB s DO
IF char in string(s[i], LOC INT, reject) THEN
return out
FI;
out:=i
OD;
return out: out
);

PROC sedol checksum = (REF STRING sedol6)INT:
(
INT out;

INT len := UPB sedol6;
INT sum := 0;

IF sedol6[len-1] = REPR 10 THEN len-:=1; sedol6[len]:=null char FI;
IF len = 7 THEN
putf(stand error, (\$"SEDOL code already checksummed? ("g")"l\$, sedol6));
out := ABS ( BIN ABS sedol6[6] AND 16r7f); return out
FI;
IF len > 7 OR len < 6 OR strcspn(sedol6, reject) /= 6 THEN
putf(stand error, (\$"not a SEDOL code? ("g")"l\$, sedol6));
out := -1; return out
FI;
FOR i TO UPB sedol6 DO
sum+:=sedol weights[i]*
IF is digit(sedol6[i]) THEN
ABS sedol6[i]- ABS "0"
ELIF is alpha(sedol6[i]) THEN
(ABS to upper(sedol6[i])-ABS "A") + 10
ELSE
putf(stand error, \$"SEDOL with not alphanumeric digit"l\$);
out:=-1; return out
FI
OD;
out := (10 - (sum MOD 10)) MOD 10 + ABS "0";
return out: out
);

main:
(
STRING line;

on logical file end(stand in, (REF FILE f)BOOL: done);
DO getf(stand in, (\$gl\$,line));
INT sr := sedol checksum(line);
IF sr > 0 THEN
printf((\$ggl\$, line, REPR sedol checksum(line)))
FI
OD;
done: SKIP
)```

Output:

```7108899
B0YBKJ7
4065663
B0YBLH2
2282765
B0YBKL9
5579107
B0YBKR5
5852842
B0YBKT7```

## ALGOL W

```begin
% returns the check digit for the specified SEDOL %
string(1) procedure sedolCheckDigit ( string(6) value sedol ) ;
begin
integer       checkSum, checkDigit;
checkSum := 0;
for cPos := 0 until 5 do begin
string(1) c;
integer   digit;
c := sedol( cPos // 1 );
if c >= "0" and c <= "9"
then digit :=        decode( c ) - decode( "0" )
else digit := 10 + ( decode( c ) - decode( "A" ) );
checkSum := checkSum + ( ( case cPos + 1 of ( 1, 3, 1, 7, 3, 9 ) ) * digit )
end for_cPos ;
checkDigit := ( 10 - ( checkSum rem 10 ) ) rem 10;
if checkDigit < 10
then code( decode( "0" ) +   checkDigit        )
else code( decode( "A" ) + ( checkDigit - 10 ) )
end sedolCheckDigit ;

procedure testCheckDigit ( string(6) value sedol; string(1) value expectedCheckDigit ) ;
begin
string(1) checkDigit;
checkDigit := sedolCheckDigit( sedol );
write( s_w := 0, sedol, checkDigit );
if checkDigit not = expectedCheckDigit then writeon( " ?? expected: ", expectedCheckDigit )
end testCheckDigit ;

testCheckDigit( "710889", "9" );
testCheckDigit( "B0YBKJ", "7" );
testCheckDigit( "406566", "3" );
testCheckDigit( "B0YBLH", "2" );
testCheckDigit( "228276", "5" );
testCheckDigit( "B0YBKL", "9" );
testCheckDigit( "557910", "7" );
testCheckDigit( "B0YBKR", "5" );
testCheckDigit( "585284", "2" );
testCheckDigit( "B0YBKT", "7" );
testCheckDigit( "B00030", "0" )
end.```
Output:
```7108899
B0YBKJ7
4065663
B0YBLH2
2282765
B0YBKL9
5579107
B0YBKR5
5852842
B0YBKT7
B000300
```

## AppleScript

```on appendCheckDigitToSEDOL(sedol)
if ((count sedol) is not 6) then ¬
return {false, "Error in appendCheckDigitToSEDOL handler: " & sedol & " doesn't have 6 characters."}
set chars to "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"
set vowels to "AEIOU"
set weights to {1, 3, 1, 7, 3, 9}

set s to 0
considering diacriticals but ignoring case -- In case these are set otherwise when this handler's called.
repeat with i from 1 to 6
set thisCharacter to character i of sedol
set o to (offset of thisCharacter in chars)
if ((o is 0) or (thisCharacter is in vowels)) then ¬
return {false, "Error in appendCheckDigitToSEDOL handler: " & sedol & " contains invalid character(s)."}
set s to s + (o - 1) * (item i of weights)
end repeat
end considering

return {true, sedol & ((10 - (s mod 10)) mod 10)}
end appendCheckDigitToSEDOL

-- Test code:
set input to "710889
B0YBKJ
406566
B0YBLH
228276
B0YBKL
557910
B0YBKR
585284
B0YBKT
B00030"
set output to {}
repeat with thisSEDOL in paragraphs of input
set {valid, theResult} to appendCheckDigitToSEDOL(thisSEDOL)
set end of output to theResult
end repeat
set astid to AppleScript's text item delimiters
set AppleScript's text item delimiters to linefeed
set output to output as text
set AppleScript's text item delimiters to astid
return output
```
Output:
```"7108899
B0YBKJ7
4065663
B0YBLH2
2282765
B0YBKL9
5579107
B0YBKR5
5852842
B0YBKT7
B000300"
```

## Arturo

```ord0: to :integer `0`
ord7: to :integer `7`
c2v: function [c][
ordC: to :integer c
if? c < `A` -> return ordC - ord0
else -> return ordC - ord7
]

weight: [1 3 1 7 3 9]

checksum: function [sedol][
val: new 0
loop .with:'i sedol 'ch ->
'val + weight\[i] * c2v ch
return to :char ord0 + (10 - val % 10) % 10
]

sedols: [
"710889" "B0YBKJ" "406566" "B0YBLH"
"228276" "B0YBKL" "557910" "B0YBKR"
"585284" "B0YBKT" "B00030"
]

loop sedols 'sed ->
print [sed "->" sed ++ checksum sed]
```
Output:
```710889 -> 7108899
B0YBKJ -> B0YBKJ7
406566 -> 4065663
B0YBLH -> B0YBLH2
228276 -> 2282765
B0YBKL -> B0YBKL9
557910 -> 5579107
B0YBKR -> B0YBKR5
585284 -> 5852842
B0YBKT -> B0YBKT7
B00030 -> B000300```

## AutoHotkey

ahk forum: discussion

### Full

```codes = 710889,B0YBKJ,406566,B0YBLH,228276,B0YBKL,557910,B0YBKR,585284,B0YBKT,B00030,ABCDEF,BBBBBBB
Loop, Parse, codes, `,
output .= A_LoopField "`t-> " SEDOL(A_LoopField) "`n"
Msgbox %output%

SEDOL(code) {
Static weight1:=1, weight2:=3, weight3:=1, weight4:=7, weight5:=3, weight6:=9
If (StrLen(code) != 6)
Return "Invalid length."
StringCaseSense On
Loop, Parse, code
If A_LoopField is Number
check_digit += A_LoopField * weight%A_Index%
Else If A_LoopField in B,C,D,F,G,H,J,K,L,M,N,P,Q,R,S,T,V,W,X,Y,Z
check_digit += (Asc(A_LoopField)-Asc("A") + 10) * weight%A_Index%
Else
Return "Invalid character."
Return code . Mod(10-Mod(check_digit,10),10)
}
```

### Short

Works with: AutoHotkey 1.1
```MsgBox % SEDOL("710889")  ;7108899
MsgBox % SEDOL("B0YBKJ")  ;B0YBKJ7
MsgBox % SEDOL("406566")  ;4065663
MsgBox % SEDOL("B0YBLH")  ;B0YBLH2
MsgBox % SEDOL("228276")  ;2282765
MsgBox % SEDOL("B0YBKL")  ;B0YBKL9
MsgBox % SEDOL("557910")  ;5579107
MsgBox % SEDOL("B0YBKR")  ;B0YBKR5
MsgBox % SEDOL("585284")  ;5852842
MsgBox % SEDOL("B0YBKT")  ;B0YBKT7

SEDOL(w) {
static weights := [1,3,1,7,3,9]
loop parse, w
s += ((c := Asc(A_LoopField)) >= 65 ? c - 65 + 10 : c - 48) * weights[A_Index]
return w Mod(10 - Mod(s, 10), 10)
}
```

## AWK

Validate or calculate checksum of SEDOL codes read from standard input (one per line)

```function ord(a)
{
return amap[a]
}

function sedol_checksum(sed)
{
sw[1] = 1; sw[2] = 3; sw[3] = 1
sw[4] = 7; sw[5] = 3; sw[6] = 9
sum = 0
for(i=1; i <= 6; i++) {
c = substr(toupper(sed), i, 1)
if ( c ~ /[[:digit:]]/ ) {
sum += c*sw[i]
} else {
sum += (ord(c)-ord("A")+10)*sw[i]
}
}
return (10 - (sum % 10)) % 10
}

BEGIN { # prepare amap for ord
for(_i=0;_i<256;_i++) {
astr = sprintf("%c", _i)
amap[astr] = _i
}
}

/[AEIOUaeiou]/ {
print "'" \$0 "' not a valid SEDOL code"
next
}
{
if ( (length(\$0) > 7) || (length(\$0) < 6) ) {
print "'" \$0 "' is too long or too short to be valid SEDOL"
next
}
sedol = substr(\$0, 1, 6)
sedolcheck = sedol_checksum(sedol)
if ( length(\$0) == 7 ) {
if ( (sedol sedolcheck) != \$0 ) {
print sedol sedolcheck " (original " \$0 " has wrong check digit"
} else {
print sedol sedolcheck
}
} else {
print sedol sedolcheck
}
}
```

## BASIC

Works with: QBasic version 1.1
Works with: QuickBasic version 4.5
```DECLARE FUNCTION getSedolCheckDigit! (str AS STRING)
DO
INPUT a\$
PRINT a\$ + STR\$(getSedolCheckDigit(a\$))
LOOP WHILE a\$ <> ""

FUNCTION getSedolCheckDigit (str AS STRING)
IF LEN(str) <> 6 THEN
EXIT FUNCTION
END IF
str = UCASE\$(str)
DIM mult(6) AS INTEGER
mult(1) = 1: mult(2) = 3: mult(3) = 1
mult(4) = 7: mult(5) = 3: mult(6) = 9
total = 0
FOR i = 1 TO 6
s\$ = MID\$(str, i, 1)
IF s\$ = "A" OR s\$ = "E" OR s\$ = "I" OR s\$ = "O" OR s\$ = "U" THEN
PRINT "No vowels"
EXIT FUNCTION
END IF
IF ASC(s\$) >= 48 AND ASC(s\$) <= 57 THEN
total = total + VAL(s\$) * mult(i)
ELSE
total = total + (ASC(s\$) - 55) * mult(i)
END IF

NEXT i
getSedolCheckDigit = (10 - (total MOD 10)) MOD 10
END FUNCTION
```

## BBC BASIC

```      PRINT FNsedol("710889")
PRINT FNsedol("B0YBKJ")
PRINT FNsedol("406566")
PRINT FNsedol("B0YBLH")
PRINT FNsedol("228276")
PRINT FNsedol("B0YBKL")
PRINT FNsedol("557910")
PRINT FNsedol("B0YBKR")
PRINT FNsedol("585284")
PRINT FNsedol("B0YBKT")
PRINT FNsedol("B00030")
END

DEF FNsedol(d\$)
LOCAL a%, i%, s%, weights%()
DIM weights%(6) : weights%() = 0, 1, 3, 1, 7, 3, 9
FOR i% = 1 TO 6
a% = ASCMID\$(d\$,i%) - &30
s% += (a% + 7 * (a% > 9)) * weights%(i%)
NEXT
= d\$ + CHR\$(&30 + (10 - s% MOD 10) MOD 10)
```

Output:

```7108899
B0YBKJ7
4065663
B0YBLH2
2282765
B0YBKL9
5579107
B0YBKR5
5852842
B0YBKT7
B000300
```

## C

Notes: it reads the codes from standard input, one per line (linefeed terminated); the input encoding must meet the following specifications: single byte encoding, digits (0-9) must have codes that follow the same order of the digits (0, 1, 2, ...) and similar for letters, the encoding must match the one used with the compiled source (likely, ASCII based encodings). This should happen 99% of the time (for ASCII, ISO-8859 family and UTF-8 have the same byte encoding for alphanumeric characters).

```#include <stdio.h>
#include <ctype.h>
#include <string.h>

int sedol_weights[] = {1, 3, 1, 7, 3, 9};
const char *reject = "AEIOUaeiou";

int sedol_checksum(const char *sedol6)
{
int len = strlen(sedol6);
int sum = 0, i;

if ( len == 7 ) {
fprintf(stderr, "SEDOL code already checksummed? (%s)\n", sedol6);
return sedol6[6] & 0x7f;
}
if ( (len > 7) || (len < 6) || ( strcspn(sedol6, reject) != 6 )) {
fprintf(stderr, "not a SEDOL code? (%s)\n", sedol6);
return -1;
}
for(i=0; i < 6; i++) {
if ( isdigit(sedol6[i]) ) {
sum += (sedol6[i]-'0')*sedol_weights[i];
} else if ( isalpha(sedol6[i]) ) {
sum += ((toupper(sedol6[i])-'A') + 10)*sedol_weights[i];
} else {
fprintf(stderr, "SEDOL with not alphanumeric digit\n");
return -1;
}
}
return (10 - (sum%10))%10 + '0';
}

#define MAXLINELEN 10
int main()
{
char line[MAXLINELEN];
int sr, len;
while( fgets(line, MAXLINELEN, stdin) != NULL ) {
len = strlen(line);
if ( line[len-1] == '\n' ) line[len-1]='\0';
sr = sedol_checksum(line);
if ( sr > 0 )
printf("%s%c\n", line, sr);
}
return 0;
}
```

Fed the input list from the task description, the output is:

```7108899
B0YBKJ7
4065663
B0YBLH2
2282765
B0YBKL9
5579107
B0YBKR5
5852842
B0YBKT7```

## C#

```static int[] sedol_weights = { 1, 3, 1, 7, 3, 9 };
static int sedolChecksum(string sedol)
{
int len = sedol.Length;
int sum = 0;

if (len == 7) //SEDOL code already checksummed?
return (int)sedol[6];

if ((len > 7) || (len < 6) || System.Text.RegularExpressions.Regex.IsMatch(sedol, "[AEIOUaeiou]+")) //invalid SEDOL
return -1;

for (int i = 0; i < 6; i++)
{
if (Char.IsDigit(sedol[i]))
sum += (((int)sedol[i] - 48) * sedol_weights[i]);

else if (Char.IsLetter(sedol[i]))
sum += (((int)Char.ToUpper(sedol[i]) - 55) * sedol_weights[i]);

else
return -1;

}

return (10 - (sum % 10)) % 10;
}
```

## C++

```#include <numeric>
#include <cctype>
#include <iostream>
#include <string>

template<typename result_sink_t>
auto sedol_checksum(std::string const& sedol, result_sink_t result_sink)
{
if(sedol.size() != 6)
return result_sink(0, "length of sedol string != 6");

const char * valid_chars = "BCDFGHJKLMNPQRSTVWXYZ0123456789";
if(sedol.find_first_not_of(valid_chars) != std::string::npos)
return result_sink(0, "sedol string contains disallowed characters");

const int weights[] = {1,3,1,7,3,9};
auto weighted_sum = std::inner_product(sedol.begin(), sedol.end(), weights, 0
, [](int acc, int prod){ return acc + prod; }
, [](char c, int weight){ return (std::isalpha(c) ? c -'A' + 10 : c - '0') * weight; }
);
return result_sink((10 - (weighted_sum % 10)) % 10, nullptr);
}

int main()
{
using namespace std;
string inputs[] = {
"710889", "B0YBKJ", "406566", "B0YBLH", "228276", "B0YBKL",
"557910", "B0YBKR", "585284", "B0YBKT", "B00030"
};
for(auto const & sedol : inputs)
{
sedol_checksum(sedol, [&](auto sum, char const * errorMessage)
{
if(errorMessage)
cout << "error for sedol: " << sedol << " message: " <<  errorMessage << "\n";
else
cout << sedol << sum << "\n";
});
}
return 0;
}
```

## Caché ObjectScript

```Class Utils.Check [ Abstract ]
{

ClassMethod SEDOL(x As %String) As %Boolean
{
// https://en.wikipedia.org/wiki/SEDOL
IF x'?1(7N,1U5UN1N) QUIT 0
IF x'=\$TRANSLATE(x,"AEIOU") QUIT 0
SET cd=\$EXTRACT(x,*), x=\$EXTRACT(x,1,*-1)
SET wgt="1317391", t=0
FOR i=1:1:\$LENGTH(x) {
SET n=\$EXTRACT(x,i)
IF n'=+n SET n=\$ASCII(n)-55
SET t=t+(n*\$EXTRACT(wgt,i))
}
QUIT cd=((10-(t#10))#10)
}

}```
Examples:
```USER>For  { Read s Quit:s=""  Write ": "_##class(Utils.Check).SEDOL(s), ! }
7108899: 1
B0YBKJ7: 1
4065663: 1
B0YBLH2: 1
2282765: 1
B0YBKL9: 1
5579107: 1
B0YBKR5: 1
5852842: 1
B0YBKT7: 1
B000300: 1

USER>```

## Clojure

```(defn sedols [xs]
(letfn [(sedol [ys] (let [weights [1 3 1 7 3 9]
convtonum (map #(Character/getNumericValue %) ys)
check (-> (reduce + (map * weights convtonum)) (rem 10) (->> (- 10)) (rem 10))]
(str ys check)))]
(map #(sedol %) xs)))
```

## COBOL

Works with: GNU Cobol version 2.0
```       >>SOURCE FREE
IDENTIFICATION DIVISION.
PROGRAM-ID. sedol.

ENVIRONMENT DIVISION.
INPUT-OUTPUT SECTION.
FILE-CONTROL.
SELECT sedol-file ASSIGN "sedol.txt"
ORGANIZATION LINE SEQUENTIAL
FILE STATUS sedol-file-status.

DATA DIVISION.
FILE SECTION.
FD  sedol-file.
01  sedol                               PIC X(6).

WORKING-STORAGE SECTION.
01  sedol-file-status                   PIC XX.
88  sedol-file-ok                   VALUE "00".

01  digit-num                           PIC 9 COMP.

01  digit-weights-area                  VALUE "1317391".
03  digit-weights                   PIC 9 OCCURS 7 TIMES.

01  weighted-sum-parts-area.
03  weighted-sum-parts              PIC 9(3) COMP OCCURS 6 TIMES.

01  weighted-sum                        PIC 9(3) COMP.

01  check-digit                         PIC 9.

PROCEDURE DIVISION.
OPEN INPUT sedol-file
PERFORM UNTIL NOT sedol-file-ok
AT END
EXIT PERFORM

MOVE FUNCTION UPPER-CASE(sedol) TO sedol

PERFORM VARYING digit-num FROM 1 BY 1 UNTIL digit-num > 6
EVALUATE TRUE
WHEN sedol (digit-num:1) IS ALPHABETIC-UPPER
IF sedol (digit-num:1) = "A" OR "E" OR "I" OR "O" OR "U"
DISPLAY "Invalid SEDOL: " sedol
EXIT PERFORM CYCLE
END-IF

COMPUTE weighted-sum-parts (digit-num) =
(FUNCTION ORD(sedol (digit-num:1)) - FUNCTION ORD("A")
+ 10) * digit-weights (digit-num)

WHEN sedol (digit-num:1) IS NUMERIC
MULTIPLY FUNCTION NUMVAL(sedol (digit-num:1))
BY digit-weights (digit-num)
GIVING weighted-sum-parts (digit-num)

WHEN OTHER
DISPLAY "Invalid SEDOL: " sedol
EXIT PERFORM CYCLE
END-EVALUATE
END-PERFORM

INITIALIZE weighted-sum
PERFORM VARYING digit-num FROM 1 BY 1 UNTIL digit-num > 6
END-PERFORM

COMPUTE check-digit =
FUNCTION MOD(10 - FUNCTION MOD(weighted-sum, 10), 10)

DISPLAY sedol check-digit
END-PERFORM

CLOSE sedol-file
.
END PROGRAM sedol.
```

## Common Lisp

Implemented from scratch using the description on Wikipedia as specification.

Works with: ClozureCL
```(defun append-sedol-check-digit (sedol &key (start 0) (end (+ start 6)))
(assert (<= 0 start end (length sedol)))
(assert (= (- end start) 6))
(loop
:with checksum = 0
:for weight :in '(1 3 1 7 3 9)
:for index :upfrom start
:do (incf checksum (* weight (digit-char-p (char sedol index) 36)))
:finally (let* ((posn (- 10 (mod checksum 10)))
(tail (digit-char posn)))
(return (concatenate 'string head (list tail))))))
```

## D

### Functional Version

```import std.stdio, std.algorithm, std.string, std.numeric, std.ascii;

char checksum(in char[] sedol) pure @safe /*@nogc*/
in {
assert(sedol.length == 6);
foreach (immutable c; sedol)
assert(c.isDigit || (c.isUpper && !"AEIOU".canFind(c)));
} out (result) {
assert(result.isDigit);
} body {
static immutable c2v = (in dchar c) => c.isDigit ? c - '0' : (c - 'A' + 10);
immutable int d = sedol.map!c2v.dotProduct([1, 3, 1, 7, 3, 9]);
return digits[10 - (d % 10)];
}

void main() {
foreach (const sedol; "710889 B0YBKJ 406566 B0YBLH 228276
B0YBKL 557910 B0YBKR 585284 B0YBKT".split)
writeln(sedol, sedol.checksum);
}
```
Output:
```7108899
B0YBKJ7
4065663
B0YBLH2
2282765
B0YBKL9
5579107
B0YBKR5
5852842
B0YBKT7```

### Imperative Version

Longer, faster lower-level version, same output.

```import std.stdio, std.algorithm, std.string, std.numeric, std.ascii;

char sedolChecksum(in char[] sedol) pure nothrow @safe /*@nogc*/
in {
assert(sedol.length == 6, "SEDOL must be 6 chars long.");

foreach (immutable c; sedol)
assert(c.isDigit ||
(c > 'A' && c <= 'Z' && ((1U << (c - 'A')) & mask)),
"SEDOL with wrong char.");
} out(result) {
assert(result.isDigit);
static int c2v(in dchar c) pure nothrow @safe @nogc {
return c.isDigit ? c - '0' : c - 'A' + 10;
}
immutable int d = sedol.map!c2v.dotProduct([1, 3, 1, 7, 3, 9]);
assert((d + result - '0') % 10 == 0);
} body {
static immutable int[] weights = [1, 3, 1, 7, 3, 9];

int sum = 0;
foreach (immutable i, immutable c; sedol) {
if (c.isDigit)
sum += (c - '0') * weights[i];
else
sum += (c - 'A' + 10) * weights[i];
}

return '0' + 10 - (sum % 10);
}

void main() {
foreach (immutable s; ["710889", "B0YBKJ", "406566", "B0YBLH",
"228276", "B0YBKL", "557910", "B0YBKR",
"585284", "B0YBKT"])
writeln(s, s.sedolChecksum);
}
```

### Short Version

Same output.

```void main() {
import std.stdio, std.algorithm, std.string, std.numeric,std.ascii;

foreach (const s; "710889 B0YBKJ 406566 B0YBLH 228276
B0YBKL 557910 B0YBKR 585284 B0YBKT".split)
writeln(s, '0' + 10 - s
.map!(c => c.isDigit ? c - '0' : c - 'A' + 10)
.dotProduct([1, 3, 1, 7, 3, 9]) % 10);
}
```

## Delphi

```program Sedol;

{\$APPTYPE CONSOLE}

uses
SysUtils;

const
SEDOL_CHR_COUNT = 6;
DIGITS = ['0'..'9'];
LETTERS = ['A'..'Z'];
VOWELS = ['A', 'E', 'I', 'O', 'U'];
ACCEPTABLE_CHRS = DIGITS + LETTERS - VOWELS;
WEIGHTS : ARRAY [1..SEDOL_CHR_COUNT] of integer = (1, 3, 1, 7, 3, 9);
LETTER_OFFSET = 9;

function AddSedolCheckDigit(Sedol : string) : string;
var
iChr : integer;
Checksum : integer;
CheckDigit : char;
begin
if Sedol <> uppercase(Sedol) then
raise ERangeError.CreateFmt('%s contains lower case characters',[Sedol]);
if length(Sedol) <> SEDOL_CHR_COUNT then
raise ERangeError.CreateFmt('"%s" length is invalid. Should be 6 characters',[Sedol]);

Checksum := 0;
for iChr := 1 to SEDOL_CHR_COUNT do
begin

if Sedol[iChr] in Vowels then
raise ERangeError.CreateFmt('%s contains a vowel (%s) at chr %d',[Sedol, Sedol[iChr], iChr]);
if not (Sedol[iChr] in ACCEPTABLE_CHRS) then
raise ERangeError.CreateFmt('%s contains an invalid chr (%s) at position %d',[Sedol, Sedol[iChr], iChr]);

if Sedol[iChr] in DIGITS then
Checksum := Checksum + (ord(Sedol[iChr]) - ord('0')) * WEIGHTS[iChr]
else
Checksum := Checksum + (ord(Sedol[iChr]) - ord('A') + 1 + LETTER_OFFSET) * WEIGHTS[iChr];

end;

Checksum := (Checksum mod 10);
if Checksum <> 0 then
Checksum := 10 - Checksum;
CheckDigit := chr(CheckSum + ord('0'));

Result := Sedol + CheckDigit;
end;

procedure Test(First6 : string);
begin
end;

begin
try
Test('710889');
Test('B0YBKJ');
Test('406566');
Test('B0YBLH');
Test('228276');
Test('B0YBKL');
Test('557910');
Test('B0YBKR');
Test('585284');
Test('B0YBKT');
Test('B00030');
except
on E : Exception do
writeln(E.Message);
end;
end.
```

Output:

```710889 becomes 7108899
B0YBKJ becomes B0YBKJ7
406566 becomes 4065663
B0YBLH becomes B0YBLH2
228276 becomes 2282765
B0YBKL becomes B0YBKL9
557910 becomes 5579107
B0YBKR becomes B0YBKR5
585284 becomes 5852842
B0YBKT becomes B0YBKT7
B00030 becomes B000300```

## E

```def weights := [1,3,1,7,3,9]
def Digit := ('0'..'9')
def Letter := ('B'..'D'|'F'..'H'|'J'..'N'|'P'..'T'|'V'..'Z')
def sedolCharValue(c) {
switch (c) {
match digit :Digit { return digit - '0' }
match letter :Letter {
return letter - 'A'
}
}
}

def checksum(sedol :String) {
require(sedol.size() == 6)
var sum := 0
for i => c in sedol {
sum += weights[i] * sedolCharValue(c)
}
return E.toString((10 - sum %% 10) %% 10)
}

return sedol + checksum(sedol)
}

for sedol in "710889
B0YBKJ
406566
B0YBLH
228276
B0YBKL
557910
B0YBKR
585284
B0YBKT".trim().split("\n") {
}```

## Elixir

Translation of: Ruby
```defmodule SEDOL do
@sedol_char  "0123456789BCDFGHJKLMNPQRSTVWXYZ" |> String.codepoints
@sedolweight  [1,3,1,7,3,9]

defp char2value(c) do
unless c in @sedol_char, do: raise ArgumentError, "No vowels"
String.to_integer(c,36)
end

def checksum(sedol) do
if String.length(sedol) != length(@sedolweight), do: raise ArgumentError, "Invalid length"
sum = Enum.zip(String.codepoints(sedol), @sedolweight)
|> Enum.map(fn {ch, weight} -> char2value(ch) * weight end)
|> Enum.sum
to_string(rem(10 - rem(sum, 10), 10))
end
end

data = ~w{
710889
B0YBKJ
406566
B0YBLH
228276
B0YBKL
557910
B0YBKR
585284
B0YBKT
B00030
C0000
1234567
00000A
}

Enum.each(data, fn sedol ->
:io.fwrite "~-8s ", [sedol]
try do
IO.puts sedol <> SEDOL.checksum(sedol)
rescue
e in ArgumentError -> IO.inspect e
end
end)
```
Output:
```710889   7108899
B0YBKJ   B0YBKJ7
406566   4065663
B0YBLH   B0YBLH2
228276   2282765
B0YBKL   B0YBKL9
557910   5579107
B0YBKR   B0YBKR5
585284   5852842
B0YBKT   B0YBKT7
B00030   B000300
C0000    %ArgumentError{message: "Invalid length"}
1234567  %ArgumentError{message: "Invalid length"}
00000A   %ArgumentError{message: "No vowels"}
```

## Excel

### LAMBDA

Defining a reusable Excel function by binding the name SEDOLCHECKSUM to a lambda expression in the Name Manager of the Excel worksheet:

```SEDOLCHECKSUM
=LAMBDA(s,
IF(6 = LEN(s),
LET(
cs, MID(s, SEQUENCE(1, 6, 1, 1), 1),
isVowel, LAMBDA(c,
ELEM(c)({"A","E","I","O","U"})
),
sedolValue, LAMBDA(c,
LET(
ic, CODE(c),
IF(65 > ic,
ic - 48,
(ic + 10) - 65
)
)
),
IF(OR(isVowel(cs)),
" -> Invalid vowel in SEDOL string",
MOD(
10 - MOD(
SUM(
MUL({1,3,1,7,3,9})(
sedolValue(cs)
)
), 10
), 10
)
)
),
"Expected a 6-character SEDOL"
)
)
```

and also assuming that the names ELEM and MUL are bound to the following reusable lambdas in Name Manager:

```ELEM
=LAMBDA(x,
LAMBDA(xs,
ISNUMBER(MATCH(x, xs, 0))
)
)

MUL
=LAMBDA(a, LAMBDA(b, a * b))
```
Output:

The appended value in cell C2 results from the expression =A2 & B2

 =SEDOLCHECKSUM(A2) fx A B C D 1 Sedols Checksums Appended 2 710889 9 7108899 3 B0YBKJ 7 B0YBKJ7 4 406566 3 4065663 5 B0YBLH 2 B0YBLH2 6 228276 5 2282765 7 B0YBKL 9 B0YBKL9 8 557910 7 5579107 9 B0YBKR 5 B0YBKR5 10 585284 2 5852842 11 B0YBKT 7 B0YBKT7 12 B00030 0 B000300 13 BOYBKT -> Invalid vowel in SEDOL string BOYBKT -> Invalid vowel in SEDOL string

## F#

```open System
let Inputs = ["710889"; "B0YBKJ"; "406566"; "B0YBLH"; "228276"; "B0YBKL"
"557910"; "B0YBKR"; "585284"; "B0YBKT"; "B00030"]

let Vowels = set ['A'; 'E'; 'I'; 'O'; 'U']
let Weights = [1; 3; 1; 7; 3; 9; 1]

let inline isVowel c = Vowels.Contains (Char.ToUpper c)

let char2value c =
if Char.IsDigit c then int c - 0x30
else (['A'..'Z'] |> List.findIndex ((=) (Char.ToUpper c))) + 10

let sedolCheckDigit (input: string) =
if input.Length <> 6 || input |> Seq.exists isVowel then
failwithf "Input must be six characters long and not contain vowels: %s" input

let sum = Seq.map2 (fun ch weight -> (char2value ch) * weight) input Weights |> Seq.sum
(10 - sum%10)%10

inputs |> List.map (fun s -> s + (sedolCheckDigit s).ToString())

let processDigits() =
try
addCheckDigit Inputs |> List.iter (printfn "%s")
with
ex -> printfn "ERROR: %s" ex.Message
```

## Factor

```USING: combinators combinators.short-circuit formatting io kernel
math math.parser regexp sequences unicode ;
IN: rosetta-code.sedols

<PRIVATE

CONSTANT: input {
"710889" "B0YBKJ" "406566" "B0YBLH" "228276" "B0YBKL"
"557910" "B0YBKR" "585284" "B0YBKT" "B00030" "AEIOUA"
"123"    ""       "B_7K90"
}

CONSTANT: weights B{ 1 3 1 7 3 9 1 }

: sedol-error ( seq -- err-str )
{
{ [ dup empty? ] [ drop "no data" ] }
{ [ dup length 6 = not ] [ drop "invalid length" ] }
[ drop "invalid char(s)" ]
} cond "*error* " prepend ;

: sedol-valid? ( seq -- ? )
{ [ length 6 = ] [ R/ [0-9BCDFGHJ-NP-TV-Z]+/ matches? ] } 1&& ;

: sedol-value ( m -- n ) dup digit? [ digit> ] [ 55 - ] if ;

: sedol-checksum ( seq -- n )
[ sedol-value ] { } map-as weights [ * ] 2map sum ;

: (sedol-check-digit) ( seq -- str )
sedol-checksum 10 mod 10 swap - 10 mod number>string ;

PRIVATE>

: sedol-check-digit ( seq -- str )
dup sedol-valid? [ (sedol-check-digit) ] [ sedol-error ] if ;

: sedol-demo ( -- )
"SEDOL   Check digit\n======  ===========" print
input [ dup sedol-check-digit "%-6s  %s\n" printf ] each ;

MAIN: sedol-demo
```
Output:
```SEDOL   Check digit
======  ===========
710889  9
B0YBKJ  7
406566  3
B0YBLH  2
228276  5
B0YBKL  9
557910  7
B0YBKR  5
585284  2
B0YBKT  7
B00030  0
AEIOUA  *error* invalid char(s)
123     *error* invalid length
*error* no data
B_7K90  *error* invalid char(s)
```

## Forth

```create weight 1 , 3 , 1 , 7 , 3 , 9 ,

: char>num ( '0-9A-Z' -- 0..35 )
dup [char] 9 > 7 and - [char] 0 - ;

: check+ ( sedol -- sedol' )
6 <> abort" wrong SEDOL length"
0 ( sum )
6 0 do
over I + c@ char>num
weight I cells + @ *
+
loop
10 mod   10 swap -  10 mod  [char] 0 +
over 6 + c! 7 ;

: sedol"   [char] " parse check+ type ;

sedol" 710889" 7108899 ok
sedol" B0YBKJ" B0YBKJ7 ok
sedol" 406566" 4065663 ok
sedol" B0YBLH" B0YBLH2 ok
sedol" 228276" 2282765 ok
sedol" B0YBKL" B0YBKL9 ok
sedol" 557910" 5579107 ok
sedol" B0YBKR" B0YBKR5 ok
sedol" 585284" 5852842 ok
sedol" B0YBKT" B0YBKT7 ok
```

## Fortran

Works with: Fortran version 90 and later
```MODULE SEDOL_CHECK
IMPLICIT NONE
CONTAINS

FUNCTION Checkdigit(c)
CHARACTER :: Checkdigit
CHARACTER(6), INTENT(IN) :: c
CHARACTER(36) :: alpha = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"
INTEGER, DIMENSION(6) :: weights = (/ 1, 3, 1, 7, 3, 9 /), temp
INTEGER :: i, n

DO i = 1, 6
temp(i) = INDEX(alpha, c(i:i)) - 1
END DO
temp = temp * weights
n = MOD(10 - (MOD(SUM(temp), 10)), 10)
Checkdigit = ACHAR(n + 48)
END FUNCTION Checkdigit

END MODULE SEDOL_CHECK

PROGRAM SEDOLTEST
USE SEDOL_CHECK
IMPLICIT NONE

CHARACTER(31) :: valid = "0123456789BCDFGHJKLMNPQRSTVWXYZ"
CHARACTER(6) :: codes(10) = (/ "710889", "B0YBKJ", "406566", "B0YBLH", "228276" ,  &
"B0YBKL", "557910", "B0YBKR", "585284", "B0YBKT" /)
CHARACTER(7) :: sedol
INTEGER :: i, invalid

DO i = 1, 10
invalid = VERIFY(codes(i), valid)
IF (invalid == 0) THEN
sedol = codes(i)
sedol(7:7) = Checkdigit(codes(i))
ELSE
sedol = "INVALID"
END IF
WRITE(*, "(2A9)") codes(i), sedol
END DO

END PROGRAM SEDOLTEST
```

Output

```  710889  7108899
B0YBKJ  B0YBKJ7
406566  4065663
B0YBLH  B0YBLH2
228276  2282765
B0YBKL  B0YBKL9
557910  5579107
B0YBKR  B0YBKR5
585284  5852842
B0YBKT  B0YBKT7
```

## FreeBASIC

```' version 05-07-2015
' compile with: fbc -s console

Function check_sedol(input_nr As String) As Integer
input_nr = Trim(input_nr)
Dim As Integer i, j, x, nr_begin, sum
Dim As String ch, legal = "AEIOU0123456789BCDFGHJKLMNPQRSTVWXYZ"
Dim As Integer weight(0 To ...) = { 1, 3, 1, 7, 3, 9, 1}

x = Len(input_nr)
If x < 6 Or x > 7 Then
Return -99 ' to long or to short
End If

For i = 0 To 5
ch = Chr(input_nr[i])
j = InStr(legal,ch)
If j < 6 Then
Return -90+j ' not a legal char. or a vowel
End If
j = ch[0] - Asc("0")
If j > 9 Then j = j + (Asc("0") + 10- Asc("A"))
If i = 0 AndAlso j < 10 Then nr_begin = 1
If nr_begin = 1 AndAlso i > 0 Then
If j > 9 Then Return -97 ' first is number then all be numbers
End If
sum = sum + j * weight(i)
Next
sum= ((10 - (sum Mod 10)) Mod 10)
If x = 7 Then
j=input_nr[6] - Asc("0") ' checksum digit is only number
If j = sum Then
Return 100+sum ' correct
Else
Return -98   ' wrong
End If
End If

Return sum ' checksum digit

End Function

Sub sedol(in As String)

Dim As Integer checksum = check_sedol(in)
Print(in);

Select Case checksum
Case -99
Print " Illegal SEDOL: wrong length"
Case -98
Print " Illegal SEDOL: checksum digits do not match"
Case -97
Print " Illegal SEDOL: starts with number, may only contain numbers"
Case -90
Print " Illegal SEDOL: illegal character"
Case -89 To -85
Print " Illegal SEDOL: No vowels allowed"
Case Is > 99
Print " Valid SEDOL: checksums match"
Case Else
Print " checksum calculated : ";in;Str(checksum)
End Select

End Sub
' ------=< MAIN >=------

Dim As Integer k,checksum
Dim As String in(1 To ...) = {"710889", "B0YBKJ", "406566", "B0YBLH",_
"228276", "B0YBKL", "557910", "B0YBKR",_
"585284", "B0YBKT", "B00030"}

Print "Calculated checksum"
For k = 1 To UBound(in) : sedol(in(k)) : Next

Print : Print "Check checksum"
Dim As String in1(1 To ...) = {"7108899", "B0YBKJ7", "4065663", "B0YBLH2",_
"2282765", "B0YBKL9","5579107", "B0YBKR5",_
"5852842", "B0YBKT7", "B000300"}

For k = 1 To UBound(in1) : sedol(in1(k)) : Next

Print : Print "Error test"
Dim As String errors(1 To ...) = {"12", "1234567890", "1B0000", "123 45",_
"A00000", "B000301"}

For k = 1 To UBound(errors) : sedol(errors(k)) : Next

' empty keyboard buffer
While Inkey <> "" : Wend
Print : Print "hit any key to end program"
Sleep
End
```
Output:
```Calculated checksum
710889 checksum calculated : 7108899
B0YBKJ checksum calculated : B0YBKJ7
406566 checksum calculated : 4065663
B0YBLH checksum calculated : B0YBLH2
228276 checksum calculated : 2282765
B0YBKL checksum calculated : B0YBKL9
557910 checksum calculated : 5579107
B0YBKR checksum calculated : B0YBKR5
585284 checksum calculated : 5852842
B0YBKT checksum calculated : B0YBKT7
B00030 checksum calculated : B000300

Check checksum
7108899 Valid SEDOL: checksums match
B0YBKJ7 Valid SEDOL: checksums match
4065663 Valid SEDOL: checksums match
B0YBLH2 Valid SEDOL: checksums match
2282765 Valid SEDOL: checksums match
B0YBKL9 Valid SEDOL: checksums match
5579107 Valid SEDOL: checksums match
B0YBKR5 Valid SEDOL: checksums match
5852842 Valid SEDOL: checksums match
B0YBKT7 Valid SEDOL: checksums match
B000300 Valid SEDOL: checksums match

Error test
12 Illegal SEDOL: wrong length
1234567890 Illegal SEDOL: wrong length
1B0000 Illegal SEDOL: starts with number, may only contain numbers
123 45 Illegal SEDOL: illegal character
A00000 Illegal SEDOL: No vowels allowed
B000301 Illegal SEDOL: checksum digits do not match```

## Gambas

```Public Sub Main()
Dim byWeight As Byte[] = [1, 3, 1, 7, 3, 9, 1]
Dim byCount, byCompute As Byte
Dim siTotal As Short
Dim sWork As New String[]
Dim sToProcess As String[] = ["710889", "B0YBKJ", "406566", "B0YBLH", "228276", "B0YBKL",
"557910", "B0YBKR", "585284", "B0YBKT", "B00030"]

For byCompute = 0 To sToProcess.Max
For byCount = 1 To 6
If IsLetter(Mid(sToProcess[byCompute], byCount, 1)) Then
sWork.Add(Str(Asc(Mid(sToProcess[byCompute], byCount, 1)) - 55) * byWeight[byCount - 1])
Else
sWork.Add(Val(Mid(sToProcess[byCompute], byCount, 1)) * byWeight[byCount - 1])
End If
Next

For byCount = 0 To 5
siTotal += Val(sWork[byCount])
Next

siTotal = (10 - (siTotal Mod 10)) Mod 10

Print sToProcess[byCompute] & " = " & sToProcess[byCompute] & siTotal
sWork.Clear()
siTotal = 0
Next

End
```

Output:

```710889 = 7108899
B0YBKJ = B0YBKJ7
406566 = 4065663
B0YBLH = B0YBLH2
228276 = 2282765
B0YBKL = B0YBKL9
557910 = 5579107
B0YBKR = B0YBKR5
585284 = 5852842
B0YBKT = B0YBKT7
B00030 = B000300
```

## Go

```package main

import (
"fmt"
"strings"
"strconv"
)

const input = `710889
B0YBKJ
406566
B0YBLH
228276
B0YBKL
557910
B0YBKR
585284
B0YBKT
B00030

B
B0003
B000300
A00030
E00030
I00030
O00030
U00030
β00030
β0003`

var weight = [...]int{1,3,1,7,3,9}

func csd(code string) string {
switch len(code) {
case 6:
case 0:
return "No data"
default:
return "Invalid length"
}
sum := 0
for i, c := range code {
n, err := strconv.ParseInt(string(c), 36, 0)
if err != nil || c == 'A' || c == 'E' || c == 'I' || c == 'O' || c == 'U' {
return "Invalid character"
}
sum += int(n)*weight[i]
}
return strconv.Itoa(9-(sum-1)%10)
}

func main() {
for _, s := range strings.Split(input, "\n") {
d := csd(s)
if len(d) > 1 {
fmt.Printf(":%s: %s\n", s, d)
} else {
fmt.Println(s + d)
}
}
}
```

Output:

```7108899
B0YBKJ7
4065663
B0YBLH2
2282765
B0YBKL9
5579107
B0YBKR5
5852842
B0YBKT7
B000300
:: No data
:B: Invalid length
:B0003: Invalid length
:B000300: Invalid length
:A00030: Invalid character
:E00030: Invalid character
:I00030: Invalid character
:O00030: Invalid character
:U00030: Invalid character
:β00030: Invalid length
:β0003: Invalid character
```

## Groovy

```def checksum(text) {
assert text.size() == 6 && !text.toUpperCase().find(/[AEIOU]+/) : "Invalid SEDOL text: \$text"

def sum = 0
(0..5).each { index ->
sum +=  Character.digit(text.charAt(index), 36) * [1, 3, 1, 7, 3, 9][index]
}
text + (10 - (sum % 10)) % 10
}
String.metaClass.sedol = { this.&checksum(delegate) }
```

Test Code:

```[ '710889': '7108899', 'B0YBKJ': 'B0YBKJ7', '406566': '4065663', 'B0YBLH': 'B0YBLH2',
'228276': '2282765', 'B0YBKL': 'B0YBKL9', '557910': '5579107', 'B0YBKR': 'B0YBKR5',
'585284': '5852842', 'B0YBKT': 'B0YBKT7', 'B00030': 'B000300'].each { text, expected ->
println "Checking \$text -> \$expected"
assert expected == text.sedol()
}
```

Output:

```Checking 710889 -> 7108899
Checking B0YBKJ -> B0YBKJ7
Checking 406566 -> 4065663
Checking B0YBLH -> B0YBLH2
Checking 228276 -> 2282765
Checking B0YBKL -> B0YBKL9
Checking 557910 -> 5579107
Checking B0YBKR -> B0YBKR5
Checking 585284 -> 5852842
Checking B0YBKT -> B0YBKT7
Checking B00030 -> B000300```

```import Data.Char (isAsciiUpper, isDigit, ord)

-------------------------- SEDOLS ------------------------

checkSum :: String -> String
checkSum x =
case traverse sedolValue x of
Right xs -> (show . checkSumFromSedolValues) xs
Left annotated -> annotated

checkSumFromSedolValues :: [Int] -> Int
checkSumFromSedolValues xs =
rem
( 10
- rem
( sum \$
zipWith
(*)
[1, 3, 1, 7, 3, 9]
xs
)
10
)
10

sedolValue :: Char -> Either String Int
sedolValue c
| c `elem` "AEIOU" = Left " ← Unexpected vowel."
| isDigit c = Right (ord c - ord '0')
| isAsciiUpper c = Right (ord c - ord 'A' + 10)

--------------------------- TEST -------------------------
main :: IO ()
main =
mapM_
(putStrLn . ((<>) <*> checkSum))
[ "710889",
"B0YBKJ",
"406566",
"B0YBLH",
"228276",
"B0YBKL",
"557910",
"B0YBKR",
"585284",
"B0YBKT",
"BOYBKT", -- Ill formed test case - illegal vowel.
"B00030"
]
```
Output:
```7108899
B0YBKJ7
4065663
B0YBLH2
2282765
B0YBKL9
5579107
B0YBKR5
5852842
B0YBKT7
BOYBKT ← Unexpected vowel.
B000300```

## Icon and Unicon

```procedure main()
every write(sedol("710889"|"B0YBKJ"|"406566"|"B0YBLH"|"228276"|
"B0YBKL"|"557910"|"B0YBKR"|"585284"|"B0YBKT"|"B00030"))
end

procedure sedol(x)   #: return the completed sedol with check digit
static w,c
initial {
every (i := -1, c := table())[!(&digits||&ucase)] := i +:= 1 # map chars
every c[!"AEIOU"] := &null                 # delete vowels
w := [1,3,1,7,3,9]                         # weights
}

if *(x := map(x,&lcase,&ucase)) = *w then {   # match lengths
every (t :=0, i := 1 to *x) do
t +:= \c[x[i]]*w[i] | fail              # accumulate weighted chars
return x  || (10 - (t%10))  % 10           # complete
}
end
```

## J

There are several ways to perform this in J. This most closely follows the algorithmic description at Wikipedia:

```sn   =.  '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ'
ac0  =:  (, 10 | 1 3 1 7 3 9 +/@:* -)&.(sn i. |:)
```

However, because J is so concise, having written the above, it becomes clear that the negation (-) is unnecessary.

The fundamental operation is the linear combination (+/@:*) and neither argument is "special". In particular, the coefficients are just another array participating in the calculation, and there's no reason we can't modify them as easily as the input array. Having this insight, it is obvious that manipulating the coefficients, rather than the input array, will be more efficient (because the coefficients are fixed at small size, while the input array can be arbitrarily large).

Which leads us to this more efficient formulation:

```ac1  =:  (, 10 | (10 - 1 3 1 7 3 9) +/@:* ])&.(sn i. |:)
```

which reduces to:

```ac2  =:  (, 10 | 9 7 9 3 7 1 +/@:* ])&.(sn i. |:)
```

Which is just as concise as ac0, but faster.

Following this train of thought, our array thinking leads us to realize that even the modulus isn't necessary. The number of SEDOL numbers is finite, as is the number of coefficients; therefore the number of possible linear combinations of these is finite. In fact, there are only 841 possible outcomes. This is a small number, and can be efficiently stored as a lookup table (even better, since the outcomes will be mod 10, they are restricted to the digits 0-9, and they repeat).

```ac3  =:  (,"1 0 (841 \$ '0987654321') {~ 1 3 1 7 3 9 +/ .*~ sn i. ])
```

Which is more than twice as fast as even the optimized formulation (ac2), though it is slightly longer.

## Java

```import java.util.Scanner;

public class SEDOL{
public static void main(String[] args){
Scanner sc = new Scanner(System.in);
while(sc.hasNext()){
String sedol = sc.next();
System.out.println(sedol + getSedolCheckDigit(sedol));
}
}

private static final int[] mult = {1, 3, 1, 7, 3, 9};

public static int getSedolCheckDigit(String str){
if(!validateSedol(str)){
System.err.println("SEDOL strings must contain six characters with no vowels.");
return -1;
}
str = str.toUpperCase();
int total = 0;
for(int i = 0;i < 6; i++){
char s = str.charAt(i);
total += Character.digit(s, 36) * mult[i];
}
return (10 - (total % 10)) % 10;
}

public static boolean validateSedol(String str){
return (str.length() == 6) && !str.toUpperCase().matches(".*?[AEIOU].*?");
}
}
```

## JavaScript

### Imperative

```function sedol(input) {
return input + sedol_check_digit(input);
}

var weight = [1, 3, 1, 7, 3, 9, 1];
function sedol_check_digit(char6) {
if (char6.search(/^[0-9BCDFGHJKLMNPQRSTVWXYZ]{6}\$/) == -1)
throw "Invalid SEDOL number '" + char6 + "'";
var sum = 0;
for (var i = 0; i < char6.length; i++)
sum += weight[i] * parseInt(char6.charAt(i), 36);
var check = (10 - sum%10) % 10;
return check.toString();
}

var input = [
'710889', 'B0YBKJ', '406566', 'B0YBLH', '228276',
'B0YBKL', '557910', 'B0YBKR', '585284', 'B0YBKT',
"BOATER" , "12345", "123456", "1234567"
];

var expected = [
'7108899', 'B0YBKJ7', '4065663', 'B0YBLH2', '2282765',
'B0YBKL9', '5579107', 'B0YBKR5', '5852842', 'B0YBKT7',
null, null, '1234563', null
];

for (var i in input) {
try {
var sedolized = sedol(input[i]);
if (sedolized == expected[i])
print(sedolized);
else
print("error: calculated sedol for input " + input[i] +
" is " + sedolized + ", but it should be " + expected[i]
);
}
catch (e) {
print("error: " + e);
}
}
```

output

```7108899
B0YBKJ7
4065663
B0YBLH2
2282765
B0YBKL9
5579107
B0YBKR5
5852842
B0YBKT7
error: Invalid SEDOL number 'BOATER'
error: Invalid SEDOL number '12345'
1234563
error: Invalid SEDOL number '1234567'```

### Functional

```(() => {
'use strict';

const main = () => {

// checkSumLR :: String -> Either String String
const checkSumLR = s => {
const
tpl = partitionEithers(map(charValueLR, s));
return 0 < tpl[0].length ? (
Left(s + ' -> ' + unwords(tpl[0]))
) : Right(rem(10 - rem(
sum(zipWith(
(a, b) => a * b,
[1, 3, 1, 7, 3, 9],
tpl[1]
)), 10
), 10).toString());
};

// charValue :: Char -> Either String Int
const charValueLR = c =>
isAlpha(c) ? (
isUpper(c) ? (
elem(c, 'AEIOU') ? Left(
'Unexpected vowel: ' + c
) : Right(ord(c) - ord('A') + 10)
) : Left('Unexpected lower case character: ' + c)
) : isDigit(c) ? Right(
parseInt(c, 10)
) : Left('Unexpected character: ' + c);

// TESTS ------------------------------------------
const [problems, checks] = Array.from(
partitionEithers(map(s => bindLR(
checkSumLR(s),
c => Right(s + c)
),
[
"710889", "B0YBKJ", "406566",
"B0YBLH", "228276", "B0YBKL",
"557910", "B0YBKR", "585284",
"B0YBKT", "B00030"
]
))
);
return unlines(
0 < problems.length ? (
problems
) : checks
);
};

// GENERIC FUNCTIONS ----------------------------

// Left :: a -> Either a b
const Left = x => ({
type: 'Either',
Left: x
});

// Right :: b -> Either a b
const Right = x => ({
type: 'Either',
Right: x
});

// Tuple (,) :: a -> b -> (a, b)
const Tuple = (a, b) => ({
type: 'Tuple',
'0': a,
'1': b,
length: 2
});

// bindLR (>>=) :: Either a -> (a -> Either b) -> Either b
const bindLR = (m, mf) =>
undefined !== m.Left ? (
m
) : mf(m.Right);

// elem :: Eq a => a -> [a] -> Bool
const elem = (x, xs) => xs.includes(x);

// isAlpha :: Char -> Bool
const isAlpha = c =>
/[A-Za-z\u00C0-\u00FF]/.test(c);

// isDigit :: Char -> Bool
const isDigit = c => {
const n = ord(c);
return 48 <= n && 57 >= n;
};

// isUpper :: Char -> Bool
const isUpper = c =>
/[A-Z]/.test(c);

// Returns Infinity over objects without finite length.
// This enables zip and zipWith to choose the shorter
// argument when one is non-finite, like cycle, repeat etc

// length :: [a] -> Int
const length = xs =>
(Array.isArray(xs) || 'string' === typeof xs) ? (
xs.length
) : Infinity;

// map :: (a -> b) -> [a] -> [b]
const map = (f, xs) =>
(Array.isArray(xs) ? (
xs
) : xs.split('')).map(f);

// ord :: Char -> Int
const ord = c => c.codePointAt(0);

// partitionEithers :: [Either a b] -> ([a],[b])
const partitionEithers = xs =>
xs.reduce(
(a, x) => undefined !== x.Left ? (
Tuple(a[0].concat(x.Left), a[1])
) : Tuple(a[0], a[1].concat(x.Right)),
Tuple([], [])
);

// rem :: Int -> Int -> Int
const rem = (n, m) => n % m;

// sum :: [Num] -> Num
const sum = xs => xs.reduce((a, x) => a + x, 0);

// take :: Int -> [a] -> [a]
// take :: Int -> String -> String
const take = (n, xs) =>
'GeneratorFunction' !== xs.constructor.constructor.name ? (
xs.slice(0, n)
) : [].concat.apply([], Array.from({
length: n
}, () => {
const x = xs.next();
return x.done ? [] : [x.value];
}));

// unlines :: [String] -> String
const unlines = xs => xs.join('\n');

// unwords :: [String] -> String
const unwords = xs => xs.join(' ');

// zipWith :: (a -> b -> c) -> [a] -> [b] -> [c]
const zipWith = (f, xs, ys) => {
const
lng = Math.min(length(xs), length(ys)),
as = take(lng, xs),
bs = take(lng, ys);
return Array.from({
length: lng
}, (_, i) => f(as[i], bs[i], i));
};

// MAIN ---
return main();
})();
```
Output:
```7108899
B0YBKJ7
4065663
B0YBLH2
2282765
B0YBKL9
5579107
B0YBKR5
5852842
B0YBKT7
B000300```

## jq

Works with: jq version 1.4

This implementation accepts strings with lowercase letters, but converts them to uppercase.

```def ascii_upcase:
explode | map( if 97 <= . and . <= 122 then . - 32  else . end) | implode;

def sedol_checksum:
def encode(a): 10 + (a|explode[0]) - ("A"|explode[0]);
. as \$sed
| [1,3,1,7,3,9] as \$sw
| reduce range(0;6) as \$i
(0;
\$sed[\$i:\$i+1] as \$c
| if ( "0123456789" | index(\$c) )
then . + (\$c|tonumber) * \$sw[\$i]
else . + encode(\$c) * \$sw[\$i]
end )
| (10 - (. % 10)) % 10 ;

# error on error, else pass input to output
def check_valid_sedol:
def has_vowel:
("AEIOU"|explode) as \$vowels
| reduce explode[] as \$c
(false; if . then . else \$vowels|index(\$c) end);

if has_vowel then error( "\(.) is not a valid SEDOL code" )
else .
end
| if length > 7 or length < 6 then
error( "\(.) is too long or too short to be valid SEDOL")
else .
end;

def sedolize:
ascii_upcase as \$in
| \$in
| check_valid_sedol
| .[0:6] as \$sedol
| (\$sedol | sedol_checksum | tostring) as \$sedolcheck
| (\$sedol + \$sedolcheck) as \$ans
| if length == 7 and \$ans != \$in then
\$ans + " (original \(\$in) has wrong checksum digit"
else \$ans
end ;
sedolize```
Output:
```# Assuming sedol.txt contains the input in the task description
\$ jq -R -r -M -f sedol.jq sedol.txt
... (output is exactly as shown in the task description)
```

## Julia

Works with: Julia version 0.6
```using Base.Test

function appendchecksum(chars::AbstractString)
if !all(isalnum, chars) throw(ArgumentError("invalid SEDOL number '\$chars'")) end
weights = [1, 3, 1, 7, 3, 9, 1]

s = 0
for (w, c) in zip(weights, chars)
s += w * parse(Int, c, 36)
end
return string(chars, (10 - s % 10) % 10)
end

tests = ["710889", "B0YBKJ", "406566", "B0YBLH", "228276", "B0YBKL", "557910", "B0YBKR", "585284", "B0YBKT", "B00030"]
csums = ["7108899", "B0YBKJ7", "4065663", "B0YBLH2", "2282765", "B0YBKL9", "5579107", "B0YBKR5", "5852842", "B0YBKT7", "B000300"]

@testset "Checksums" begin
for (t, c) in zip(tests, csums)
@test appendchecksum(t) == c
end
end
```
Output:
```Test Summary: | Pass  Total
Checksums     |   11     11```

## Kotlin

```// version 1.1.0

val weights = listOf(1, 3, 1, 7, 3, 9, 1)

fun sedol7(sedol6: String): String {
if (sedol6.length != 6) throw IllegalArgumentException("Length of argument string must be 6")
var sum = 0
for (i in 0..5) {
val c = sedol6[i]
val v = when (c) {
in '0'..'9' -> c.toInt() - 48
in 'A'..'Z' -> c.toInt() - 55
else        -> throw IllegalArgumentException("Argument string contains an invalid character")
}
sum += v * weights[i]
}
val check = (10 - (sum % 10)) % 10
return sedol6 + (check + 48).toChar()
}

fun main(args: Array<String>) {
val sedol6s = listOf("710889", "B0YBKJ", "406566", "B0YBLH", "228276", "B0YBKL",
"557910", "B0YBKR", "585284", "B0YBKT", "B00030")
for (sedol6 in sedol6s) println("\$sedol6 -> \${sedol7(sedol6)}")
}
```
Output:
```710889 -> 7108899
B0YBKJ -> B0YBKJ7
406566 -> 4065663
B0YBLH -> B0YBLH2
228276 -> 2282765
B0YBKL -> B0YBKL9
557910 -> 5579107
B0YBKR -> B0YBKR5
585284 -> 5852842
B0YBKT -> B0YBKT7
B00030 -> B000300
```

## langur

Translation of: Go
Works with: langur version 0.8.10
```val .csd = f(.code) {
given len(.code) {
case 0:
case != 6:
return "invalid length"
}

if matching(re/[^B-DF-HJ-NP-TV-Z0-9]/, .code) {
return "invalid character(s)"
}

val .weight = [1,3,1,7,3,9]

val .nums = s2n .code
val .sum = for[=0] .i of .nums {
_for += .nums[.i] x .weight[.i]
}

toString 9 - (.sum - 1) rem 10
}

val .h = h{
# invalid...
"": 0,
"123": 0,
"A00030": 0,
"E00030": 0,
"I00030": 0,
"O00030": 0,
"U00030": 0,
"β00030": 0,

# valid...
"710889": 9,
"B0YBKJ": 7,
"406566": 3,
"B0YBLH": 2,
"228276": 5,
"B0YBKL": 9,
"557910": 7,
"B0YBKR": 5,
"585284": 2,
"B0YBKT": 7,
"B00030": 0,
}

for .input in sort(keys .h) {
val .d = .csd(.input)
if len(.d) > 1 {
writeln .input, ": ", .d
} else {
val .expect = toString .h[.input]
write .input, .d
writeln if .expect == .d {""} else {
\$" (SEDOL test failed; expected check digit \.expect;)"}
}
}```
Output:
```: nada, zip, zilch
123: invalid length
2282765
4065663
5579107
5852842
7108899
A00030: invalid character(s)
B000300
B0YBKJ7
B0YBKL9
B0YBKR5
B0YBKT7
B0YBLH2
E00030: invalid character(s)
I00030: invalid character(s)
O00030: invalid character(s)
U00030: invalid character(s)
β00030: invalid character(s)
```

## Liberty BASIC

```'adapted from BASIC solution
mult(1) = 1: mult(2) = 3: mult(3) = 1
mult(4) = 7: mult(5) = 3: mult(6) = 9

DO
INPUT a\$
PRINT a\$ + STR\$(getSedolCheckDigit(a\$))
LOOP WHILE a\$ <> ""

FUNCTION getSedolCheckDigit (str\$)
IF LEN(str\$) <> 6 THEN
EXIT FUNCTION
END IF
str\$ = upper\$(str\$)
total = 0
FOR i = 1 TO 6
s\$ = MID\$(str\$, i, 1)
IF (s\$ = "A") OR (s\$ = "E") OR (s\$ = "I") OR (s\$ = "O") OR (s\$ = "U") THEN
PRINT "No vowels"
EXIT FUNCTION
END IF
IF (ASC(s\$) >= 48) AND (ASC(s\$) <= 57) THEN
total = total + VAL(s\$) * mult(i)
ELSE
total = total + (ASC(s\$) - 55) * mult(i)
END IF

NEXT i
getSedolCheckDigit = (10 - (total MOD 10)) MOD 10
END FUNCTION```

## M4

```divert(-1)
changequote(`[',`]')
define([_bar],include(sedol.inp))
define([eachlineA],
[ifelse(eval(\$2>0),1,
[\$3(substr([\$1],0,\$2))[]eachline(substr([\$1],incr(\$2)),[\$3])])])
define([eachline],[eachlineA([\$1],index(\$1,[
]),[\$2])])
define([_idx],
[index([0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ],substr(\$1,\$2,1))])
define([_wsum],
[eval(_idx(\$1,0)+_idx(\$1,1)*3+_idx(\$1,2)+_idx(\$1,3)*7+_idx(\$1,4)*3+_idx(\$1,5)*9)])
define([checksum],
[\$1[]eval((10-_wsum(\$1)%10)%10)
])
divert
eachline(_bar,[checksum])```

## Mathematica/Wolfram Language

```SEDOL[Code_?(Function[v,StringFreeQ[v,{"A","E","I","O","U"}]])]:=
Code<>ToString[10-Mod[ToExpression[Quiet[Flatten[Characters[Code]
/.x_?LetterQ->(ToCharacterCode[x]-55)]]].{1,3,1,7,3,9},10]]
Scan[Print[SEDOL[#]] &, {"710889","B0YBKJ","406566","B0YBLH","228276","B0YBKL","557910","B0YBKR","585284","B0YBKT","B00030","DUMMY"}]
```
Output:
```7108899
B0YBKJ7
4065663
B0YBLH2
2282765
B0YBKL9
5579107
B0YBKR5
5852842
B0YBKT7
B0003010
SEDOL[DUMMY] -> rejected<pre>

<syntaxhighlight lang="text">:- module sedol.
:- interface.

:- import_module io.
:- pred main(io::di, io::uo) is det.

:- implementation.
:- import_module char, int, list, require, string.

main(!IO) :-
Input = [
"710889",
"B0YBKJ",
"406566",
"B0YBLH",
"228276",
"B0YBKL",
"557910",
"B0YBKR",
"585284",
"B0YBKT",
"B00030"
],
list.foldl(print_with_checksum, Input, !IO).

:- pred print_with_checksum(string::in, io::di, io::uo) is det.

print_with_checksum(S, !IO) :-
io.format("%s%d\n", [s(S), i(sedol_checksum(S))], !IO).

:- func sedol_checksum(string) = int.

sedol_checksum(Sedol) = CheckSum :-
Digits = string.foldr((func(C, A) = [to_sedol_code(C) | A]), Sedol, []),
WeightedDigits = list.map_corresponding(int.times, Digits, [1, 3, 1, 7, 3, 9]),
WeightedSum = list.foldl(int.plus, WeightedDigits, 0),
CheckSum = (10 - (WeightedSum mod 10)) mod 10.

:- func to_sedol_code(char) = int.

to_sedol_code(Char) =
( if char.digit_to_int(Char, Code), not is_vowel(to_upper(Char))
then Code
else func_error("invalid SEDOL")
).

:- pred is_vowel(char::in) is semidet.

is_vowel('A').
is_vowel('E').
is_vowel('I').
is_vowel('O').
is_vowel('U').</syntaxhighlight>

<syntaxhighlight lang="modula3">MODULE SEDOL EXPORTS Main;

IMPORT IO, Fmt, Text, Stdio;

VAR test := ARRAY [1..10] OF TEXT {"710889", "B0YBKJ", "406566", "B0YBLH",
"228276", "B0YBKL", "557910", "B0YBKR",
"585284", "B0YBKT" };

PROCEDURE Check(sed: TEXT): INTEGER RAISES {BadSedol}=
VAR
weights := ARRAY [0..5] OF INTEGER {1, 3, 1, 7, 3, 9};
result, d: INTEGER;
char: CHAR;
BEGIN
IF Text.Length(sed) # 6 THEN
RAISE BadSedol("ERROR: Must be 6 digits.");
END;
result := 0;
FOR i := 0 TO 5 DO
char := Text.GetChar(sed, i);
CASE char OF
| '0'..'9' => d := ORD(char) - ORD('0');
| 'B'..'D', 'F'..'H', 'J'..'N', 'P'..'T', 'V'..'Z'
=> d := ORD(char) - ORD('A') + 10;
ELSE
RAISE BadSedol("ERROR: Must be numbers or (non-vowel) letters.");
END;
INC(result, d * weights[i]);
END;
result := (10 - (result MOD 10)) MOD 10;
RETURN result;
END Check;

BEGIN
TRY
FOR i := FIRST(test) TO LAST(test) DO
IO.Put(test[i] & Fmt.Char(VAL(ORD('0') + Check(test[i]), CHAR)) & "\n");
END;
EXCEPT
| BadSedol(text) => IO.Put(text & "\n", Stdio.stderr);
END;
END SEDOL.</syntaxhighlight>
Output:
<pre>7108899
B0YBKJ7
4065663
B0YBLH2
2282765
B0YBKL9
5579107
B0YBKR5
5852842
B0YBKT7```

## MUMPS

```SEDOL
NEW A,B
SEDOL1
READ !,"Enter the first 6 digits of a SEDOL: ",A
SET B=\$\$SEDOLCHK(A)
WRITE !,\$SELECT(\$LENGTH(B)=1:"Full SEDOL is "_A_B,1:B)
GOTO SEDOL1
QUIT
SEDOLCHK(STOCK)
NEW WT,VAL,I,CHK,C,FLAG
SET WT="1317391",VAL=0,FLAG=0
FOR I=1:1:6 SET C=\$\$TOUPPER(\$EXTRACT(STOCK,I)),VAL=VAL+(\$\$SEDVAL(C)*\$EXTRACT(WT,I)) SET:"AEIOUaeiou"[C FLAG=1
SET:\$LENGTH(STOCK)'=6 FLAG=1
KILL WT,I,CHK,C
QUIT \$SELECT(FLAG:"INVALID",'FLAG:(10-(VAL#10))#10)
SEDVAL(X)
QUIT \$SELECT(\$ISVALIDNUM(X):X,1:\$ASCII(X)-\$ASCII("@")+9)
TOUPPER(X)
NEW UP,LO
SET UP="ABCDEFGHIJKLMNOPQRSTUVWXYZ",LO="abcdefghijklmnopqrstuvwxyz"
QUIT \$TRANSLATE(X,LO,UP)```

Examples:

```USER>D SEDOL^ROSETTA

Enter the first 6 digits of a SEDOL: 710889
Full SEDOL is 7108899
Enter the first 6 digits of a SEDOL: B0YBKJ
Full SEDOL is B0YBKJ7
Enter the first 6 digits of a SEDOL: 406566
Full SEDOL is 4065663
Enter the first 6 digits of a SEDOL: B0YBLH
Full SEDOL is B0YBLH2
Enter the first 6 digits of a SEDOL: 228276
Full SEDOL is 2282765
Enter the first 6 digits of a SEDOL: B0YBKL
Full SEDOL is B0YBKL9
Enter the first 6 digits of a SEDOL: 557910
Full SEDOL is 5579107
Enter the first 6 digits of a SEDOL: B0YBKR
Full SEDOL is B0YBKR5
Enter the first 6 digits of a SEDOL: 585284
Full SEDOL is 5852842
Enter the first 6 digits of a SEDOL: B0YBKT
Full SEDOL is B0YBKT7
Enter the first 6 digits of a SEDOL: B00030
Full SEDOL is B000300
Enter the first 6 digits of a SEDOL: Booo3o
INVALID
Enter the first 6 digits of a SEDOL: B123456
INVALID```

## Nim

```proc c2v(c: char): int =
assert c notin "AEIOU"
if c < 'A': ord(c) - ord('0') else: ord(c) - ord('7')

const weight = [1, 3, 1, 7, 3, 9]

proc checksum(sedol: string): char =
var val = 0
for i, ch in sedol:
val += c2v(ch) * weight[i]
result = chr((10 - val mod 10) mod 10 + ord('0'))

for sedol in ["710889", "B0YBKJ", "406566", "B0YBLH",
"228276", "B0YBKL", "557910", "B0YBKR",
"585284", "B0YBKT", "B00030"]:
echo sedol, " → ", sedol & checksum(sedol)
```
Output:
```710889 → 7108899
B0YBKJ → B0YBKJ7
406566 → 4065663
B0YBLH → B0YBLH2
228276 → 2282765
B0YBKL → B0YBKL9
557910 → 5579107
B0YBKR → B0YBKR5
585284 → 5852842
B0YBKT → B0YBKT7
B00030 → B000300```

## OCaml

```let char2value c =
assert (not (String.contains "AEIOU" c));
match c with
| '0'..'9' -> int_of_char c - int_of_char '0'
| 'A'..'Z' -> int_of_char c - int_of_char 'A' + 10
| _ -> assert false

let sedolweight = [1;3;1;7;3;9]

let explode s =
s |> String.to_seq |> List.of_seq

let checksum sedol =
let tmp = List.fold_left2 (fun sum ch weight -> sum + char2value ch * weight)
0 (explode sedol) sedolweight in
string_of_int ((10 - (tmp mod 10)) mod 10) ;;

List.iter (fun sedol -> print_endline (sedol ^ checksum sedol))
[ "710889";
"B0YBKJ";
"406566";
"B0YBLH";
"228276";
"B0YBKL";
"557910";
"B0YBKR";
"585284";
"B0YBKT" ]
```

## Oforth

```func: sedol(s)
[ 1, 3, 1, 7, 3, 9 ] s
zipWith(#[ dup isDigit ifTrue: [ '0' - ] else: [ 'A' - 10 + ] * ]) sum
10 mod 10 swap - 10 mod
StringBuffer new s << swap '0' + <<c ;```
Output:
```[ "710889", "B0YBKJ", "406566", "B0YBLH", "228276", "B0YBKL", "557910", "B0YBKR", "585284", "B0YBKT", "B00030" ]
apply(#[ sedol println ])
7108899
B0YBKJ7
4065663
B0YBLH2
2282765
B0YBKL9
5579107
B0YBKR5
5852842
B0YBKT7
B000300
```

## Pascal

Works with: Free_Pascal
```program Sedols(output);

function index(c: char): integer;
const
alpha = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ';
var
i: integer;
begin
index := 0;
for i := low(alpha) to high(alpha) do
if c = alpha[i] then
index := i;
end;

function checkdigit(c: string): char;
const
weight: array [1..6] of integer = (1, 3, 1, 7, 3, 9);
var
i, sum: integer;
begin
sum := 0;
for i := 1 to 6 do
sum := sum + (index(c[i]) - 1) * weight[i];
checkdigit := char((10 - (sum mod 10)) mod 10 + 48);
end;

const
codes: array [1..11] of string =
('710889', 'B0YBKJ', '406566', 'B0YBLH',
'228276', 'B0YBKL', '557910', 'B0YBKR',
'585284', 'B0YBKT', 'B00030');

var
seforl: string;
i: integer;

begin
for i := low(codes) to high(codes) do
begin
seforl := codes[i];
setlength(seforl, 7);
seforl[7] := checkdigit(codes[i]);
writeln(codes[i], ' -> ', seforl);
end;
end.
```

Output:

```% ./Sedols
710889 -> 7108899
B0YBKJ -> B0YBKJ7
406566 -> 4065663
B0YBLH -> B0YBLH2
228276 -> 2282765
B0YBKL -> B0YBKL9
557910 -> 5579107
B0YBKR -> B0YBKR5
585284 -> 5852842
B0YBKT -> B0YBKT7
B00030 -> B000300```

## Perl

This program reads from standard input.

```use List::Util qw(sum);
use POSIX qw(strtol);

sub zip :prototype(&\@\@) {
my \$f = shift;
my @a = @{shift()};
my @b = @{shift()};
my @result;
push(@result, \$f->(shift @a, shift @b)) while @a && @b;
return @result;
}

my @weights = (1, 3, 1, 7, 3, 9);
sub sedan :prototype(\$) {
my \$s = shift;
\$s =~ /[AEIOU]/ and die "No vowels";
my @vs = map {(strtol \$_, 36)[0]} split //, \$s;
my \$checksum = sum (zip {\$_[0] * \$_[1]} @vs, @weights);
my \$check_digit = (10 - \$checksum % 10) % 10;
return \$s . \$check_digit;
}

while (<>) {
chomp;
print sedol(\$_), "\n";
}
```

## Phix

```type string6(object s)
return string(s) and length(s)=6
end type

type sedolch(integer ch)
return ch>='0' and ch<='Z' and (ch<='9' or ch>='A') and not find(ch,"AEIOU")
end type

function sedol(string6 t)
sedolch c
integer s = 0
for i=1 to 6 do
c = t[i]
s += iff(c>='A'?c-'A'+10:c-'0')*{1,3,1,7,3,9}[i]
end for
return t & mod(10-mod(s,10),10)+'0'
end function

constant tests = {"710889",
"B0YBKJ",
"406566",
"B0YBLH",
"228276",
"B0YBKL",
"557910",
"B0YBKR",
"585284",
"B0YBKT",
"B00030"}
for i=1 to length(tests) do
?sedol(tests[i])
end for
```
Output:
```"7108899"
"B0YBKJ7"
"4065663"
"B0YBLH2"
"2282765"
"B0YBKL9"
"5579107"
"B0YBKR5"
"5852842"
"B0YBKT7"
"B000300"
```

## Phixmonti

Translation of: RPL
```include ..\Utilitys.pmt

def ->7DOL
( 1 3 1 7 3 9 ) var weights
0 >ps
6 for >ps
tps get
dup 65 >= if 7 - endif 48 -
weights ps> get nip * ps> + >ps
endfor
10 ps> 10 mod - 10 mod tostr chain
enddef

( "710889" "B0YBKJ" "406566" "B0YBLH" "228276" "B0YBKL" "557910" "B0YBKR" "585284" "B0YBKT" "B00030" )

getid ->7DOL map

pstack```
Output:
```[["7108899", "B0YBKJ7", "4065663", "B0YBLH2", "2282765", "B0YBKL9", "5579107", "B0YBKR5", "5852842", "B0YBKT7", "B000300"]]

=== Press any key to exit ===```

## PHP

```function char2value(\$c) {
assert(stripos('AEIOU', \$c) === FALSE);
return intval(\$c, 36);
}

\$sedolweight = array(1,3,1,7,3,9);

function checksum(\$sedol) {
global \$sedolweight;
\$tmp = array_sum(array_map(create_function('\$ch, \$weight', 'return char2value(\$ch) * \$weight;'),
str_split(\$sedol), \$sedolweight)
);
return strval((10 - (\$tmp % 10)) % 10);
}

foreach (array('710889',
'B0YBKJ',
'406566',
'B0YBLH',
'228276',
'B0YBKL',
'557910',
'B0YBKR',
'585284',
'B0YBKT') as \$sedol)
echo \$sedol, checksum(\$sedol), "\n";
```

## PicoLisp

```(de sedol (Str)
(pack Str
(char
(+ `(char "0")
(%
(- 10
(%
(sum
'((W C)
(cond
((>= "9" C "0")
(* W (format C)) )
((>= "Z" (setq C (uppc C)) "A")
(* W (+ 10 (- (char C) `(char "A")))) ) ) )
(1 3 1 7 3 9)
(chop Str) )
10 ) )
10 ) ) ) ) )

(for S '("710889" "B0YBKJ" "406566" "B0YBLH" "228276" "B0YBKL" "557910" "B0YBKR" "585284" "B0YBKT" "B00030")
(prinl (sedol S)) )```

## PL/I

```/* Compute SEDOLs; includes check for invalid characters. */
sedol: procedure options (main); /* 3 March 2012 */
declare alphabet character (36) static initial
('0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ');
declare weight (6) fixed static initial (1, 3, 1, 7, 3, 9);
declare s character (6);
declare (i, v, k) fixed;

do while ('1'b);
get edit (s) (a(6));
put skip edit (s) (a);
/* Check for invalid characters: */
if verify(s, '0123456789BCDFGHJKLMNPQRSTVWXYZ') > 0 then stop;
v = 0;
do i = 1 to 6;
k = index(alphabet, substr(s, i, 1)) - 1;
v = v + weight(i) * k;
end;
k = mod(v, 10);
v = mod(10 - k, 10);
put edit (s, v) (x(2), a, f(1)); put edit ('  ') (a);
end;
end sedol;```
Output:
```710889  7108899
B0YBKJ  B0YBKJ7
406566  4065663
B0YBLH  B0YBLH2
228276  2282765
B0YBKL  B0YBKL9
557910  5579107
B0YBKR  B0YBKR5
585284  5852842
B0YBKT  B0YBKT7
B00030  B000300
```

## Potion

No extra credit.

```sedolnum = (c) :
if ("0" ord <= c ord and c ord <= "9" ord): c number integer.
else: 10 + c ord - "A" ord.
.

sedol = (str) :
weight = (1, 3, 1, 7, 3, 9)
sum = 0
6 times (i) :
sum = sum + sedolnum(str(i)) * weight(i)
.
(str, (10 - (sum % 10)) % 10) join
.```

## PowerShell

```function Add-SEDOLCheckDigit
{
Param ( #  Validate input as six-digit SEDOL number
[ValidatePattern( "^[0123456789bcdfghjklmnpqrstvwxyz]{6}\$" )]
[parameter ( Mandatory = \$True ) ]
[string]
\$SixDigitSEDOL )

#  Convert to array of single character strings, using type char as an intermediary
\$SEDOL = [string[]][char[]]\$SixDigitSEDOL

#  Define place weights
\$Weight = @( 1, 3, 1, 7, 3, 9 )

#  Define character values (implicit in 0-based location within string)
\$Characters = "0123456789abcdefghijklmnopqrstuvwxyz"

\$CheckSum = 0

#  For each digit, multiply the character value by the weight and add to check sum
0..5 | ForEach { \$CheckSum += \$Characters.IndexOf( \$SEDOL[\$_].ToLower() ) * \$Weight[\$_] }

#  Derive the check digit from the partial check sum
\$CheckDigit = ( 10 - \$CheckSum % 10 ) % 10

#  Return concatenated result
return ( \$SixDigitSEDOL + \$CheckDigit )
}

#  Test
\$List = @(
"710889"
"B0YBKJ"
"406566"
"B0YBLH"
"228276"
"B0YBKL"
"557910"
"B0YBKR"
"585284"
"B0YBKT"
"B00030"
)

ForEach ( \$PartialSEDOL in \$List )
{
}
```
Output:
```7108899
B0YBKJ7
4065663
B0YBLH2
2282765
B0YBKL9
5579107
B0YBKR5
5852842
B0YBKT7
B000300```

## PureBasic

```Procedure.s SEDOLs(rawstring\$)
Protected i, j, sum, c, m
For i=1 To Len(rawstring\$)
c=Asc(Mid(rawstring\$,i,1))
Select c
Case Asc("0") To Asc("9")
j=Val(Mid(rawstring\$,i,1))
Default
j=c-Asc("A")
EndSelect
Select i
Case 1, 3, 7:  m=1
Case 2, 5:     m=3
Case 4:        m=7
Default:       m=9
EndSelect
sum+j*m
Next
sum=(10-(sum%10))%10
ProcedureReturn rawstring\$+Str(sum)
EndProcedure

Define result\$, i
Restore Tests
For i=0 To 10
result\$+SEDOLs(SEDOL\$)
If i%2
result\$+#CRLF\$
ElseIf i<10
result\$+", "
EndIf
Next
MessageRequester("SEDOLs","Result"+#CRLF\$+result\$)

DataSection
Tests:
Data.s  "710889","B0YBKJ","406566","B0YBLH","228276"
Data.s  "B0YBKL","557910","B0YBKR","585284","B0YBKT","B00030"
EndDataSection
```

## Python

```def char2value(c):
assert c not in 'AEIOU', "No vowels"
return int(c, 36)

sedolweight = [1,3,1,7,3,9]

def checksum(sedol):
tmp = sum(map(lambda ch, weight: char2value(ch) * weight,
sedol, sedolweight)
)
return str((10 - (tmp % 10)) % 10)

for sedol in '''
710889
B0YBKJ
406566
B0YBLH
228276
B0YBKL
557910
B0YBKR
585284
B0YBKT
'''.split():
print sedol + checksum(sedol)
```

Or, combining reduce with an option type – handling disallowed characters without assertion errors:

Works with: Python version 3.7
```'''SEDOL checksum digits'''

from functools import reduce

# sedolCheckSumDigitLR :: String -> Either String Char
def sedolCheckSumDigitLR(s):
'''Either an explanatory message, or a
checksum digit character to append
to a given six-character SEDOL string.
'''
def goLR(lr, cn):
c, n = cn
return bindLR(lr)(
lambda a: bindLR(sedolValLR(c))(
lambda x: Right(a + x * n)
)
)
return bindLR(
reduce(
goLR,
zip(s, [1, 3, 1, 7, 3, 9]),
Right(0)
)
)(lambda d: Right(str((10 - (d % 10)) % 10)))

# sedolValLR :: Char -> Either String Char
def sedolValLR(c):
'''Either an explanatory message, or the
SEDOL value of a given character.
'''
return Right(int(c, 36)) if (
c not in 'AEIOU'
) else Left('Unexpected vowel in SEDOL string: ' + c)

# TEST -------------------------------------------------
def main():
'''Append checksums where valid.'''

print(
fTable(__doc__ + ':\n')(str)(
either(str)(str)
)(sedolCheckSumDigitLR)(
'''710889
B0YBKJ
406566
B0YBLH
228276
B0YBKL
BOYBKL
557910
B0YBKR
585284
B0YBKT
B00030
'''.split()
)
)

# GENERIC -------------------------------------------------

# Left :: a -> Either a b
def Left(x):
'''Constructor for an empty Either (option type) value
with an associated string.'''
return {'type': 'Either', 'Right': None, 'Left': x}

# Right :: b -> Either a b
def Right(x):
'''Constructor for a populated Either (option type) value'''
return {'type': 'Either', 'Left': None, 'Right': x}

# bindLR (>>=) :: Either a -> (a -> Either b) -> Either b
def bindLR(m):
Two computations sequentially composed,
with any value produced by the first
passed as an argument to the second.'''
return lambda mf: (
mf(m.get('Right')) if None is m.get('Left') else m
)

# compose (<<<) :: (b -> c) -> (a -> b) -> a -> c
def compose(g):
'''Right to left function composition.'''
return lambda f: lambda x: g(f(x))

# either :: (a -> c) -> (b -> c) -> Either a b -> c
def either(fl):
'''The application of fl to e if e is a Left value,
or the application of fr to e if e is a Right value.'''
return lambda fr: lambda e: fl(e['Left']) if (
None is e['Right']
) else fr(e['Right'])

# fTable :: String -> (a -> String) ->
#                     (b -> String) ->
#        (a -> b) -> [a] -> String
def fTable(s):
'''Heading -> x display function -> fx display function ->
f -> value list -> tabular string.'''
def go(xShow, fxShow, f, xs):
w = max(map(compose(len)(xShow), xs))
return s + '\n' + '\n'.join([
xShow(x).rjust(w, ' ') + ' -> ' + fxShow(f(x)) for x in xs
])
return lambda xShow: lambda fxShow: (
lambda f: lambda xs: go(
xShow, fxShow, f, xs
)
)

# MAIN ---
if __name__ == '__main__':
main()
```
Output:
```SEDOL checksum digits:

710889 -> 9
B0YBKJ -> 7
406566 -> 3
B0YBLH -> 2
228276 -> 5
B0YBKL -> 9
BOYBKL -> Unexpected vowel in SEDOL string: O
557910 -> 7
B0YBKR -> 5
585284 -> 2
B0YBKT -> 7
B00030 -> 0```

## Q

```scd:{
v:{("i"\$x) - ?[("0"<=x) & x<="9"; "i"\$"0"; -10+"i"\$"A"]} each x; / Turn characters of SEDOL into their values
w:sum v*1 3 1 7 3 9;        / Weighted sum of values
d:(10 - w mod 10) mod 10;   / Check digit value
x,"c"\$(("i"\$"0")+d)         / Append to SEDOL
}

scd each ("710889";"B0YBKJ";"406566";"B0YBLH";"228276";"B0YBKL";"557910";"B0YBKR";"585284";"B0YBKT";"B00030")```

## Quackery

```  [ 48 - dup 9 > if [ 7 - ] ] is chvalue ( c --> n )

[ 0 over witheach
[ chvalue
' [ 1 3 1 7 3 9 ]
i^ peek * + ]
10 mod 10 swap - 10 mod
48 + join ]               is ->sedol ( \$ --> \$ )

\$ "710889 B0YBKJ 406566 B0YBLH
228276 B0YBKL 557910 B0YBKR
585284 B0YBKT B00030" nest\$

witheach [ ->sedol echo\$ cr ]```
Output:
```7108899
B0YBKJ7
4065663
B0YBLH2
2282765
B0YBKL9
5579107
B0YBKR5
5852842
B0YBKT7
B000300```

## R

```# Read in data from text connection
B0YBKJ
406566
B0YBLH
228276
B0YBKL
557910
B0YBKR
585284
B0YBKT")); close(tc)

# Check data valid
checkSedol <- function(datalines)
{
ok <- grep("^[[:digit:][:upper:]]{6}\$", datalines)
if(length(ok) < length(datalines))
{
stop("there are invalid lines")
}
}
checkSedol(datalines)

# Append check digit
appendCheckDigit <- function(x)
{
if(length(x) > 1) return(sapply(x, appendCheckDigit))
ascii <- as.integer(charToRaw(x))
scores <- ifelse(ascii < 65, ascii - 48, ascii - 55)
weights <- c(1, 3, 1, 7, 3, 9)
chkdig <- (10 - sum(scores * weights) %% 10) %% 10
paste(x, as.character(chkdig), sep="")
}
withchkdig <- appendCheckDigit(datalines)

#Print in format requested
writeLines(withchkdig)
```

## Racket

```#lang racket
;;; Since the Task gives us unchecksummed and checksummed SEDOLs, and
;;; we'll just take a list of the output SEDOLs and remove their last
;;; characters for the input
(define output-SEDOLS
(list "7108899" "B0YBKJ7" "4065663"
"B0YBLH2" "2282765" "B0YBKL9"
"5579107" "B0YBKR5" "5852842"
"B0YBKT7" "B000300"))
(define (output->input-SEDOL S) (substring S 0 6))
(define input-SEDOLS (map output->input-SEDOL output-SEDOLS))

;;; checksum calculation
(define (SEDOL-character-value c)
(if (char-numeric? c)
(- (char->integer c) (char->integer #\0))
(+ 10 (- (char->integer c) (char->integer #\A)))))
(define (SEDOL-character-sum S)
(for/sum ((c S)  ; if we run out of c's before the final 1 in weight, we'll have the unchecksummed weighted sum
(weight (in-list '(1 3 1 7 3 9 1))))
(* weight (SEDOL-character-value c))))
(define (SEDOL-checksum S) (number->string (modulo (- 10 (SEDOL-character-sum S)) 10)))

;;; build output from input
(define (SEDOL-append-checksum S) (string-append S (SEDOL-checksum S)))

;;; Extra credit -- according to wikipedia:
;;; "SEDOLs are seven characters in length"
;;; "vowels are never used"
;;; there seems to be no statement as to case, but we'll assert that too!
;;;
;;; valid-SEDOL? is a predicate... it doesn't report a reason
(define (invalid-SEDOL? S)
(define (invalid-SEDOL-character? c)
(if
(and (not (char-upper-case? c)) (not (char-numeric? c)))
(format "contains non upper case/non numeric ~a" c)
(case c [(#\A #\E #\I #\O #\U) (format "contains vowel ~a" c)] [else #f])))
(cond
[(< (string-length S) 7) "too few characters"]
[(> (string-length S) 7) "too many characters"]
[(not (zero? (modulo (SEDOL-character-sum S) 10))) "invalid checksum"]
[(for/first ((c S) #:when (invalid-SEDOL-character? c)) c) => identity]
[else #f])) ; a.k.a. valid!

(module+ main
(for* ((S input-SEDOLS))
(displayln (SEDOL-append-checksum S)))
(newline)
(displayln "Extra Credit!")
(displayln (invalid-SEDOL? "B0YBKT7")) ; expect #f output
(displayln (invalid-SEDOL? "B000301")) ; expect "invalid checksum" output
)

(module+ test
(require rackunit)
(check-= (SEDOL-character-value #\3) 3 0)
(check-= (SEDOL-character-value #\B) 11 0)
(check-equal? (invalid-SEDOL? "B000301") "invalid checksum")
(for ((S output-SEDOLS))
(check-false (invalid-SEDOL? S))
(check-equal? (SEDOL-append-checksum (substring S 0 6))
S (format "test SEDOL for ~a" S))))
```

Output:

```7108899
B0YBKJ7
4065663
B0YBLH2
2282765
B0YBKL9
5579107
B0YBKR5
5852842
B0YBKT7
B000300

Extra Credit!
#f
invalid checksum```

## Raku

(formerly Perl 6)

Translation of: Perl
Works with: rakudo version 2015-12-17
```sub sedol( Str \$s ) {
die 'No vowels allowed' if \$s  ~~ /<[AEIOU]>/;
die 'Invalid format'    if \$s !~~ /^ <[0..9B..DF..HJ..NP..TV..Z]>**6 \$ /;

my %base36 = (flat 0..9, 'A'..'Z') »=>« ^36;
my @weights = 1, 3, 1, 7, 3, 9;

my @vs = %base36{ \$s.comb };
my \$checksum = [+] @vs Z* @weights;
my \$check_digit = (10 - \$checksum % 10) % 10;
return \$s ~ \$check_digit;
}

say sedol(\$_) for <
710889
B0YBKJ
406566
B0YBLH
228276
B0YBKL
557910
B0YBKR
585284
B0YBKT
B00030
>;
```

## REXX

```         ╔════════════════════════════════════════════════════════════════════╗
║  If the SEDOL is 6 characters, a check digit is added.             ║
║                                                                    ║
║  If the SEDOL is 7 characters, a check digit is created and it's   ║
║  verified that it's equal to the check digit already on the SEDOL. ║
╚════════════════════════════════════════════════════════════════════╝
```
```/*REXX program computes the  check digit (last digit) for six or seven character SEDOLs.*/
@abcU    = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'          /*the uppercase Latin alphabet.        */
alphaDigs= '0123456789'@abcU                     /*legal characters,  and then some.    */
allowable=space(translate(alphaDigs,,'AEIOU'),0) /*remove the vowels from the alphabet. */
weights  = 1317391                               /*various weights for SEDOL characters.*/
@.=                                              /* [↓]  the ARG statement capitalizes. */
arg @.1 .                                        /*allow a user─specified  SEDOL from CL*/
if @.1==''  then do                              /*if none, then assume eleven defaults.*/
@.1  =  710889                  /*if all numeric, we don't need quotes.*/
@.2  = 'B0YBKJ'
@.3  =  406566
@.4  = 'B0YBLH'
@.5  =  228276
@.6  = 'B0YBKL'
@.7  =  557910
@.8  = 'B0YBKR'
@.9  =  585284
@.10 = 'B0YBKT'
@.11 = 'B00030'
end

do j=1  while  @.j\=='';      sedol=@.j    /*process each of the specified SEDOLs.*/
L=length(sedol)
if L<6 | L>7        then call ser "SEDOL isn't a valid length"
if left(sedol,1)==9 then call swa 'SEDOL is reserved for end user allocation'
_=verify(sedol, allowable)
if _\==0            then call ser 'illegal character in SEDOL:'  substr(sedol, _, 1)
sum=0                                      /*the  checkDigit  sum  (so far).      */
do k=1  for 6                      /*process each character in the SEDOL. */
sum=sum + ( pos( substr(sedol, k, 1), alphaDigs) -1) * substr(weights, k, 1)
end   /*k*/

chkDig= (10-sum//10) // 10
r=right(sedol, 1)
if L==7 & chkDig\==r  then call ser sedol, 'invalid check digit:' r
say 'SEDOL:'   left(sedol,15)      'SEDOL + check digit ───► '   left(sedol,6)chkDig
end       /*j*/
exit                                             /*stick a fork in it,  we're all done. */
/*──────────────────────────────────────────────────────────────────────────────────────*/
sed:  say;  say 'SEDOL:'  sedol;          say;                          return
ser:  say;  say '***error***'   arg(1);   call sed;                     exit 13
swa:  say;  say '***warning***' arg(1);   say;                          return
```

output   when using the defaults:

```SEDOL: 710889          SEDOL + check digit ───►  7108899
SEDOL: B0YBKJ          SEDOL + check digit ───►  B0YBKJ7
SEDOL: 406566          SEDOL + check digit ───►  4065663
SEDOL: B0YBLH          SEDOL + check digit ───►  B0YBLH2
SEDOL: 228276          SEDOL + check digit ───►  2282765
SEDOL: B0YBKL          SEDOL + check digit ───►  B0YBKL9
SEDOL: 557910          SEDOL + check digit ───►  5579107
SEDOL: B0YBKR          SEDOL + check digit ───►  B0YBKR5
SEDOL: 585284          SEDOL + check digit ───►  5852842
SEDOL: B0YBKT          SEDOL + check digit ───►  B0YBKT7
SEDOL: B00030          SEDOL + check digit ───►  B000300
```

## Ring

```see sedol("710889") + nl
see sedol("B0YBKJ") + nl
see sedol("406566") + nl
see sedol("B0YBLH") + nl
see sedol("228276") + nl
see sedol("B0YBKL") + nl
see sedol("557910") + nl
see sedol("B0YBKR") + nl
see sedol("585284") + nl
see sedol("B0YBKT") + nl
see sedol("B00030") + nl

func sedol d
d = upper(d)
s = 0
weights  = [1, 3, 1, 7, 3, 9]
for i = 1 to 6
a = substr(d,i,1)
if ascii(a) >= 48 and ascii(a) <= 57
s += number(a) * weights[i]
else
s += (ascii(a) - 55) * weights[i] ok
next
return d + (10 - (s % 10)) % 10```

Output:

```7108899
B0YBKJ7
4065663
B0YBLH2
2282765
B0YBKL9
5579107
B0YBKR5
5852842
B0YBKT7
B000300
```

## RPL

Works with: Halcyon Calc version 4.2.7
RPL code Comment
```≪
{ 1 3 1 7 3 9 } → weights
≪ 0 1 6 FOR j
OVER j DUP SUB NUM
IF DUP 65 ≥ THEN 7 - END 48 -
weights j GET * +
NEXT
10 SWAP OVER MOD - 10 MOD →STR +
≫ ≫ '→7DOL' STO
```
```→7DOL ( "SEDOL6" -- "SEDOL7" )
store weights
sum=0 ; for j = 1 to 6
get jth character of SEDOL
convert it to its index
sum += index * weight

check = mod(10-mod(sum,10),10)
.
```
Input:
``` ≪ { }
{ "710889" "B0YBKJ" "406566" "B0YBLH" "228276" "B0YBKL" "557910" "B0YBKR" "585284" "B0YBKT" "B00030" }
1 OVER SIZE FOR j DUP j GET →7DOL SWAP + SWAP NEXT DROP
≫ EVAL
```
Output:
```1: { "7108899" "B0YBKJ7" "4065663" "B0YBLH2" "2282765" "B0YBKL9" "5579107" "B0YBKR5" "5852842" "B0YBKT7" "B000300" }
```

## Ruby

```Sedol_char = "0123456789BCDFGHJKLMNPQRSTVWXYZ"
Sedolweight = [1,3,1,7,3,9]

def char2value(c)
raise ArgumentError, "Invalid char #{c}" unless Sedol_char.include?(c)
c.to_i(36)
end

def checksum(sedol)
raise ArgumentError, "Invalid length" unless sedol.size == Sedolweight.size
sum = sedol.chars.zip(Sedolweight).sum{|ch, weight| char2value(ch) * weight }
((10 - (sum % 10)) % 10).to_s
end

data = %w(710889
B0YBKJ
406566
B0YBLH
228276
B0YBKL
557910
B0YBKR
585284
B0YBKT
B00030
C0000
1234567
00000A)

data.each do |sedol|
print "%-8s " % sedol
begin
puts sedol + checksum(sedol)
rescue => e
p e
end
end
```
Output:
```710889   7108899
B0YBKJ   B0YBKJ7
406566   4065663
B0YBLH   B0YBLH2
228276   2282765
B0YBKL   B0YBKL9
557910   5579107
B0YBKR   B0YBKR5
585284   5852842
B0YBKT   B0YBKT7
B00030   B000300
C0000    #<ArgumentError: Invalid length>
1234567  #<ArgumentError: Invalid length>
00000A   #<ArgumentError: No vowels>
```

## Rust

```fn sedol(input: &str) -> Option<String> {
let weights = vec![1, 3, 1, 7, 3, 9, 1];
let valid_chars = "0123456789BCDFGHJKLMNPQRSTVWXYZ";

if input.len() != 6 {
return None;
}

// could be done by regex if needed
for c in input.chars() {
if !valid_chars.contains(c) {
return None;
}
}

let mut result: u32 = input
.chars()
.map(|c| {
if c.is_digit(10) {
c as u32 - 48
} else {
c as u32 - 55
}
})
.zip(weights)
.map(|(cnum, w)| w * cnum)
.collect::<Vec<u32>>()
.iter()
.sum();

result = (10 - result % 10) % 10;

Some(input.to_owned() + &result.to_string())
}

fn main() {
let inputs = vec![
"710889", "B0YBKJ", "406566", "B0YBLH", "228276", "B0YBKL", "557910", "B0YBKR", "585284",
"B0YBKT", "B00030",
];

for input in inputs {
println!("{} SEDOL: {:?}", &input, sedol(&input).unwrap());
}
}
```
Output:
```710889 SEDOL: "7108899"
B0YBKJ SEDOL: "B0YBKJ7"
406566 SEDOL: "4065663"
B0YBLH SEDOL: "B0YBLH2"
228276 SEDOL: "2282765"
B0YBKL SEDOL: "B0YBKL9"
557910 SEDOL: "5579107"
B0YBKR SEDOL: "B0YBKR5"
585284 SEDOL: "5852842"
B0YBKT SEDOL: "B0YBKT7"
B00030 SEDOL: "B000300"
```

## Scala

```class SEDOL(s: String) {
require(s.size == 6 || s.size == 7, "SEDOL length must be 6 or 7 characters")
require(s.size == 6 || s(6).asDigit == chksum, "Incorrect SEDOL checksum")
require(s forall (c => !("aeiou" contains c.toLower)), "Vowels not allowed in SEDOL")
def chksum = 10 - ((s zip List(1, 3, 1, 7, 3, 9) map { case (c, w) => c.asDigit * w } sum) % 10)
override def toString = s.take(6) + chksum
}
```

Test cases:

```scala> """710889
| B0YBKJ
| 406566
| B0YBLH
| 228276
| B0YBKL
| 557910
| B0YBKR
| 585284
| B0YBKT""".lines.map(_.trim).foreach(s => println(new SEDOL(s)))
7108899
B0YBKJ7
4065663
B0YBLH2
2282765
B0YBKL9
5579107
B0YBKR5
5852842
B0YBKT7
```

Validations:

```scala> new SEDOL("12")
java.lang.IllegalArgumentException: requirement failed: SEDOL length must be 6 or 7 characters

scala> new SEDOL("7108890")
java.lang.IllegalArgumentException: requirement failed: Incorrect SEDOL checksum

scala> new SEDOL("71088A")
java.lang.IllegalArgumentException: requirement failed: Vowels not allowed in SEDOL
```

## Seed7

```\$ include "seed7_05.s7i";

const func char: sedolCheckDigit (in string: sedol) is func
result
var char: checkDigit is ' ';
local
const array integer: weight is [] (1, 3, 1, 7, 3, 9);
var char: ch is ' ';
var integer: index is 0;
var integer: item is 0;
var integer: sum is 0;
begin
for ch key index range sedol do
case ch of
when {'0' .. '9'}:
item := ord(ch) - ord('0');
when {'A' .. 'Z'} - {'A', 'E', 'I', 'O', 'U'}:
item := ord(ch) - ord('A') + 10;
otherwise:
raise RANGE_ERROR;
end case;
sum +:= item * weight[index];
end for;
checkDigit := chr(-sum mod 10 + ord('0'));
end func;

const proc: main is func
local
var string: sedol is "";
begin
for sedol range [] ("710889", "B0YBKJ", "406566", "B0YBLH", "228276", "B0YBKL",
"557910", "B0YBKR", "585284", "B0YBKT", "B00030") do
writeln(sedol <& sedolCheckDigit(sedol));
end for;
end func;```
Output:
```7108899
B0YBKJ7
4065663
B0YBLH2
2282765
B0YBKL9
5579107
B0YBKR5
5852842
B0YBKT7
B000300
```

## Sidef

Translation of: Raku
```func sedol(s) {

die 'No vowels allowed' if (s ~~ /[AEIOU]/);
die 'Invalid format'    if (s !~ /^[0-9B-DF-HJ-NP-TV-Z]{6}\$/);

const base36 = ((@(0..9) + @('A'..'Z')) ~Z @(0..35) -> flatten.to_h);
const weights = [1, 3, 1, 7, 3, 9];

var vs = [base36{ s.chars... }];
var checksum = (vs ~Z* weights -> sum);
var check_digit = ((10 - checksum%10) % 10);
return (s + check_digit);
}

%w(
710889
B0YBKJ
406566
B0YBLH
228276
B0YBKL
557910
B0YBKR
585284
B0YBKT
B00030
).each { |s|
say sedol(s);
}
```
Output:
```7108899
B0YBKJ7
4065663
B0YBLH2
2282765
B0YBKL9
5579107
B0YBKR5
5852842
B0YBKT7
B000300
```

## Smalltalk

Works with: GNU Smalltalk
```String extend [
includesAnyOf: aSet [
aSet do: [ :e | (self includes: e) ifTrue: [ ^true ] ].
^false
]
].
```
```Object subclass: SEDOL [
|weight charList|

initialize [
weight := Array from: { 1. 3. 1. 7. 3. 9 }.
charList :=
('ABCDEFGHIJKLMNOPQRSTUVWXYZ' asOrderedCollection)
collect: [ :c | ('AEIOU' includes: c) ifTrue: [ nil ] ifFalse: [ c ] ].
]

SEDOL class >> new [
^ (self basicNew) initialize
]

"to be considered private"
blindCheckDigit: aSEDOL [ |sum|
sum := 0.
aSEDOL keysAndValuesDo: [ :i :c |
('0123456789' includes: c)
ifTrue: [  sum := sum +
((weight at: i) *
]
ifFalse: [ sum := sum + (((charList indexOf: c) + 9) *
(weight at: i))
]
].
^ ((10 - (sum rem: 10)) rem: 10) displayString
]

checked: aSEDOL [
(aSEDOL size < 6) |
(aSEDOL size > 7) |
(aSEDOL asUppercase includesAnyOf: 'AEIOU' asSet )
ifTrue: [ SystemExceptions.InvalidArgument
signalOn: aSEDOL
reason: 'Not a valid SEDOL'
]
ifFalse: [ |t| t := aSEDOL copyFrom: 1 to: 6.
^ t , (self blindCheckDigit: t)
]
]
].
```
```|sedol|
sedol := SEDOL new.
{  '710889'.
'B0YBKJ'.
'406566'.
'B0YBLH'.
'228276'.
'B0YBKL'.
'557910'.
'B0YBKR'.
'585284'.
'B0YBKT' } do: [ :c | (sedol checked: c) displayNl ]
```
Works with: Smalltalk/X
```#(
'710889'
'B0YBKJ'
'406566'
'B0YBLH'
'228276'
'B0YBKL'
'557910'
'B0YBKR'
'585284'
'B0YBKT'
'B00030'
) do:[:in |
|um check|

sum := 0.
(in to:6) with:#[1 3 1 7 3 9 ] do:[:ch :weight |
sum := sum + (ch digitValue * weight).
].
check := (10 - (sum%10)) % 10.
Transcript showCR: ( in,(Character digitValue:check))
].
```
Output:

7108899 B0YBKJ7 4065663 B0YBLH2 2282765 B0YBKL9 5579107 B0YBKR5 5852842 B0YBKT7 B000300

## SQL PL

Works with: Db2 LUW
version 9.7 or higher.

With SQL PL:

```--#SET TERMINATOR @

SET SERVEROUTPUT ON@

CREATE OR REPLACE FUNCTION CHECK_SEDOL (
IN TEXT VARCHAR(6)
) RETURNS VARCHAR(7)
BEGIN
DECLARE TYPE SEDOL AS CHAR(1) ARRAY [6];
--declare text varchar(6) default 'B12345';
DECLARE WEIGHT SEDOL;
DECLARE I SMALLINT;
DECLARE SENTENCE VARCHAR(256);
DECLARE CHAR_AT CHAR(1);
DECLARE OUTPUT CHAR(1);
DECLARE SUM SMALLINT;
DECLARE CHECK SMALLINT;
DECLARE INVALID_CHAR CONDITION FOR SQLSTATE '22004' ;
DECLARE STMT STATEMENT;

-- Converts all to upper.
SET TEXT = UPPER (TEXT);
-- CALL DBMS_OUTPUT.PUT_LINE(TEXT);
-- Checks the characters.
SET I = 1;
WHILE (I <= 6) DO
SET CHAR_AT = SUBSTR(TEXT, I, 1);
-- CALL DBMS_OUTPUT.PUT_LINE('Char ' || CHAR_AT);
SET SENTENCE = 'SET ? = (SELECT SEDOL FROM (SELECT ''' || CHAR_AT
|| ''' SEDOL FROM SYSIBM.SYSDUMMY1) WHERE SEDOL IN (''B'',''C'',''D'',''F'',''G'',''H'',''J'','
|| '''K'',''L'',''M'',''N'',''P'',''Q'',''R'',''S'',''T'',''V'',''W'',''X'',''Y'',''Z'',''0'','
|| '''1'',''2'',''3'',''4'',''5'',''6'',''7'',''8'',''9''))';
PREPARE STMT FROM SENTENCE;
EXECUTE STMT INTO OUTPUT;
IF (OUTPUT IS NULL) THEN
SIGNAL INVALID_CHAR;
END IF;
SET I = I + 1;
END WHILE;

-- Assigns weight
SET WEIGHT[1] = '1';
SET WEIGHT[2] = '3';
SET WEIGHT[3] = '1';
SET WEIGHT[4] = '7';
SET WEIGHT[5] = '3';
SET WEIGHT[6] = '9';

-- Process the SEDOL.
SET SUM = 0;
SET I = 1;
WHILE (I <= 6) DO
SET CHAR_AT = SUBSTR(TEXT, I, 1);
IF (ASCII(CHAR_AT) > 65) THEN
SET SUM = SUM + WEIGHT[I] * (ASCII(CHAR_AT) - 64 + 9);
ELSE
SET SUM = SUM + WEIGHT[I] * CHAR_AT;
END IF;
SET I = I + 1;
END WHILE;
SET CHECK = MOD((10 - MOD(SUM, 10)), 10);
CALL DBMS_OUTPUT.PUT_LINE(CHECK);
RETURN TEXT || CHECK;
END @```

Output:

```db2 -td@
db2 => SET SERVEROUTPUT ON@
DB20000I  The SET SERVEROUTPUT command completed successfully.
db2 => CREATE OR REPLACE FUNCTION CHECK_SEDOL (
...
db2 (cont.) => END @
DB20000I  The SQL command completed successfully.

db2 -x
db2 => values CHECK_SEDOL('710889')
7108899
9
db2 => values CHECK_SEDOL('B0YBKJ')
B0YBKJ7
7
db2 => values CHECK_SEDOL('406566')
4065663
3
db2 => values CHECK_SEDOL('B0YBLH')
B0YBLH2
2
db2 => values CHECK_SEDOL('228276')
2282765
5
db2 => values CHECK_SEDOL('B0YBKL')
B0YBKL9
9
db2 => values CHECK_SEDOL('557910')
5579107
7
db2 => values CHECK_SEDOL('B0YBKR')
B0YBKR5
5
db2 => values CHECK_SEDOL('585284')
5852842
2
db2 => values CHECK_SEDOL('B0YBKT')
B0YBKT7
7
db2 => values CHECK_SEDOL('B00030')
B000300
0
```

## Standard ML

```fun char2value c =
if List.exists (fn x => x = c) (explode "AEIOU") then raise Fail "no vowels"
else if Char.isDigit c then ord c - ord #"0"
else if Char.isUpper c then ord c - ord #"A" + 10
else raise Match

val sedolweight = [1,3,1,7,3,9]

fun checksum sedol = let
val tmp = ListPair.foldlEq (fn (ch, weight, sum) => sum + char2value ch * weight)
0 (explode sedol, sedolweight)
in
Int.toString ((10 - (tmp mod 10)) mod 10)
end

app (fn sedol => print (sedol ^ checksum sedol ^ "\n"))
[ "710889",
"B0YBKJ",
"406566",
"B0YBLH",
"228276",
"B0YBKL",
"557910",
"B0YBKR",
"585284",
"B0YBKT" ];
```

## Tcl

```namespace eval sedol {
variable chars {0 1 2 3 4 5 6 7 8 9 "" B C D "" F G H "" J K L M N "" P Q R S T "" V W X Y Z}
variable weight {1 3 1 7 3 9 1}

proc checksum {alnum6} {
variable chars
variable weight
set sum 0
set col 0
foreach char [split [string toupper [string range \$alnum6 0 5]] ""] {
if {[set idx [lsearch -exact \$chars \$char]] == -1} {
error "invalid character: \$char"
}
incr sum [expr {\$idx * [lindex \$weight \$col]}]
incr col
}
return [expr {(10 - (\$sum % 10)) % 10}]
}

proc valid {alnum7} {
expr {[checksum [string range \$alnum7 0 5]] == [string index \$alnum7 6]}
}
}

proc assert {condition {message "Assertion failed!"}} {
if { ! [uplevel 1 [list expr \$condition]]} {
return -code error \$message
}
}

set codes {710889 B0YBKJ 406566 B0YBLH 228276 B0YBKL 557910 B0YBKR 585284 B0YBKT}
set answers {7108899 B0YBKJ7 4065663 B0YBLH2 2282765 B0YBKL9 5579107 B0YBKR5 5852842 B0YBKT7}

set sedol "\${code}[sedol::checksum \$code]"
puts \$sedol
}
```

## Transact-SQL

SQL Server transact-SQL implementation. Compatible with all versions from 6.5 to 2008. Returns empty string if invalid.

```CREATE FUNCTION [dbo].[fn_CheckSEDOL]
( @SEDOL varchar(50) )
RETURNS varchar(7)
AS
BEGIN
declare	@true bit = 1,
@false bit = 0,
@isSEDOL bit,
@sedol_weights varchar(6) ='131739',
@sedol_len int = LEN(@SEDOL),
@sum int = 0

if ((@sedol_len = 6))
begin
select @SEDOL = UPPER(@SEDOL)
Declare	@vowels varchar(5) = 'AEIOU',
@letters varchar(21) = 'BCDFGHJKLMNPQRSTVWXYZ',
@i int=1,
@isStillGood bit = @true,
@char char = '',
@weighting int =0

select @isSEDOL = @false

while ((@i < 7) and (@isStillGood = @true))
begin
select	@char = SUBSTRING(@SEDOL,@i,1),
@weighting = CONVERT (INT,SUBSTRING(@sedol_weights, @i, 1))
if (CHARINDEX(@char, @vowels) > 0) -- no vowels please
begin
select @isStillGood=@false
end
else
begin
if (ISNUMERIC(@char) = @true) -- is a number
begin
select @sum = @sum + (ASCII(@char) - 48) * @weighting
end
else if (CHARINDEX(@char, @letters) = 0) -- test for the rest of the alphabet
begin
select @isStillGood=@false
end
else
begin
select @sum = @sum + (ASCII(@char) - 55) * @weighting
end
end
select @i = @i +1
end -- of while loop
if (@isStillGood = @true)
begin
declare @checksum int = (10 - (@sum%10))%10
select @SEDOL = @SEDOL + CONVERT(CHAR,@checksum)
end
end
else
begin
select @SEDOL = ''
end
-- Return the result of the function
RETURN @SEDOL
END
```

Examples:

```print dbo.fn_CheckSEDOL('710889')
print dbo.fn_CheckSEDOL('B0YBKJ')
print dbo.fn_CheckSEDOL('406566')
print dbo.fn_CheckSEDOL('B0YBLH')
print dbo.fn_CheckSEDOL('228276')
print dbo.fn_CheckSEDOL('B0YBKL')
print dbo.fn_CheckSEDOL('557910')
print dbo.fn_CheckSEDOL('B0YBKR')
print dbo.fn_CheckSEDOL('585284')
print dbo.fn_CheckSEDOL('B0YBKT')
print dbo.fn_CheckSEDOL('B00030')

7108899
B0YBKJ7
4065663
B0YBLH2
2282765
B0YBKL9
5579107
B0YBKR5
5852842
B0YBKT7
B000300```

## TUSCRIPT

```\$\$ MODE TUSCRIPT
check="1'3'1'7'3'9"
values="123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"
value=STRINGS (values,":<%:")
BUILD r_TABLE/or illegal=":A:E:I:O:U:"
LOOP input="710889'B0YBKJ'406566'B0YBLH'228276'B0YBKL'557910'B0YBKR'585284'B0YBKT'BOYAKT'B00030",sum=""
IF (input.ma.illegal) THEN
PRINT/ERROR input, " illegal"
CYCLE
ENDIF
strings=STRINGS (input,":<%:")
LOOP d,nr=strings
c=SELECT (check,#d)
IF (nr!='digits') nr=FILTER_INDEX (value,":{nr}:",-)
x=nr*c, sum=APPEND(sum,x)
ENDLOOP
endsum=SUM(sum), checksum=10-(endsum%10)
IF (checksum==10) checksum=0
PRINT input, " checkdigit: ", checksum
ENDLOOP```

Output:

```710889 checkdigit: 9
B0YBKJ checkdigit: 7
406566 checkdigit: 3
B0YBLH checkdigit: 2
228276 checkdigit: 5
B0YBKL checkdigit: 9
557910 checkdigit: 7
B0YBKR checkdigit: 5
585284 checkdigit: 2
B0YBKT checkdigit: 7
@@@@@@@@  BOYAKT illegal
B00030 checkdigit: 0
```

## Ursala

The straightforward approach closely follows the published specification, using a table-driven finite map (charval) from characters to numbers, and calculating the inner product as a cumulative sum of the weight vector zipped with the product function to the list of character values.

```#import std
#import nat

alphabet = digits-- ~=`A-~r letters
weights  = <1,3,1,7,3,9>
charval  = -:@rlXS num alphabet
iprod    = sum:-0+ product*p/weights+ charval*
checksum = difference/10+ remainder\10+ iprod```

An optimization following the J solution avoids a run-time subtraction by complementing the coefficients at compile time using these definitions in place of those above.

```weights  = difference/*10 <1,3,1,7,3,9>
checksum = remainder\10+ iprod```

A further performance improvement subsumes the character value lookup and multiplcation table within the same finite map in the version shown below.

```lookup   = -: (^/~& product^|/~& charval)*lsPrK0/weights alphabet
iprod    = sum:-0+ lookup*p/weights```

To optimize further, we can build a separate smaller multiplication table for each coefficient, letting the coefficient be hard coded and allowing faster lookups. The zipwith operation (*p) is also avoided by having each map index directly into the input list.

```lookups  = (-:+ * ^/~&l product^|/charval ~&)* *-* -*weights alphabet
iprod    = sum:-0+ gang +^|(~&,~)*lNrXXK9 ^(~&,&h!)* lookups```

Here is a test program.

```#show+

examples = ^T(~&,~&h+ %nP+ checksum)*t

-[
710889
B0YBKJ
406566
B0YBLH
228276
B0YBKL
557910
B0YBKR
585284
B0YBKT]-```

output:

```7108899
B0YBKJ7
4065663
B0YBLH2
2282765
B0YBKL9
5579107
B0YBKR5
5852842
B0YBKT7```

## VBA

```Function getSedolCheckDigit(Input1)
Dim mult(6) As Integer
mult(1) = 1: mult(2) = 3: mult(3) = 1
mult(4) = 7: mult(5) = 3: mult(6) = 9
If Len(Input1) <> 6 Then
getSedolCheckDigit = "Six chars only please"
Exit Function
End If
Input1 = UCase(Input1)
Total = 0
For i = 1 To 6
s1 = Mid(Input1, i, 1)
If (s1 = "A") Or (s1 = "E") Or (s1 = "I") Or (s1 = "O") Or (s1 = "U") Then
getSedolCheckDigit = "No vowels"
Exit Function
End If
If (Asc(s1) >= 48) And (Asc(s1) <= 57) Then
Total = Total + Val(s1) * mult(i)
Else
Total = Total + (Asc(s1) - 55) * mult(i)
End If

Next i
getSedolCheckDigit = Input1 + CStr((10 - (Total Mod 10)) Mod 10)

End Function```

## VBScript

Derived from the BASIC version.

```arr = Array("710889",_
"B0YBKJ",_
"406566",_
"B0YBLH",_
"228276",_
"B0YBKL",_
"557910",_
"B0YBKR",_
"585284",_
"B0YBKT",_
"12345",_
"A12345",_
"B00030")

For j = 0 To UBound(arr)
WScript.StdOut.Write arr(j) & getSEDOLCheckDigit(arr(j))
WScript.StdOut.WriteLine
Next

Function getSEDOLCheckDigit(str)
If Len(str) <> 6 Then
getSEDOLCheckDigit = " is invalid. Only 6 character strings are allowed."
Exit Function
End If
Set mult = CreateObject("Scripting.Dictionary")
With mult
End With
total = 0
For i = 1 To 6
s  = Mid(str,i,1)
If s = "A" Or s = "E" Or s = "I" Or s = "O" Or s = "U" Then
getSEDOLCheckDigit = " is invalid. Vowels are not allowed."
Exit Function
End If
If Asc(s) >= 48 And Asc(s) <=57 Then
total = total + CInt(s) * CInt(mult.Item(CStr(i)))
Else
total = total + (Asc(s) - 55) * CInt(mult.Item(CStr(i)))
End If
Next
getSEDOLCheckDigit = (10 - total Mod 10) Mod 10
End Function
```
Output:
```7108899
B0YBKJ7
4065663
B0YBLH2
2282765
B0YBKL9
5579107
B0YBKR5
5852842
B0YBKT7
12345 is invalid. Only 6 character strings are allowed.
A12345 is invalid. Vowels are not allowed.
B000300```

## Visual FoxPro

```#DEFINE ALPHABET "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
#DEFINE VOWELS "AEIOU"
#DEFINE VALIDCHARS "0123456789" + ALPHABET
LOCAL cMsg As String, cCode As String
LOCAL ARRAY codes[12]
codes[1] = "710889"
codes[2] = "B0YBKJ"
codes[3] = "406566"
codes[4] = "B0YBLH"
codes[5] = "228276"
codes[6] = "B0YBKL"
codes[7] = "557910"
codes[8] = "B0YBKR"
codes[9] = "585284"
codes[10] = "B0YBKT"
codes[11] = "B00030"
codes[12] = "B0030A"
DIMENSION w[6]
w[1] = 1
w[2] = 3
w[3] = 1
w[4] = 7
w[5] = 3
w[6] = 9
CLEAR
FOR EACH cCode IN codes
cMsg = ""
IF IsValidCode(@cCode, @cMsg)	&& Parameters passed by reference
cCode = cCode + GetCheckDigit(cCode)
? cCode
ELSE
? cCode, cMsg
ENDIF
ENDFOR

FUNCTION GetCheckDigit(tcCode As String) As String
LOCAL i As Integer, c As String, s As Integer, k As Integer
s = 0
FOR i = 1 TO 6
c = SUBSTR(tcCode, i, 1)
IF ISDIGIT(c)
k = VAL(c)
ELSE
k = 9 + AT(c, ALPHABET)
ENDIF
s = s + k*w[i]
ENDFOR
RETURN TRANSFORM((10 - s%10)%10)
ENDFUNC

FUNCTION IsValidCode(tcCode As String, tcMsg As String) As Boolean
LOCAL n As Integer, c As String, i As Integer
*!* Get rid of any spaces and convert to upper case
tcCode = UPPER(STRTRAN(tcCode, " "))
n = LEN(tcCode)
IF LEN(tcCode) # 6
tcMsg = "Code must be 6 characters."
ELSE
FOR i = 1 TO n
c = SUBSTR(tcCode, i, 1)
IF NOT c \$ VALIDCHAR
tcMsg = c + " is not a valid character."
EXIT
ELSE
IF c \$ VOWELS
tcMsg = "Vowels are not allowed."
EXIT
ENDIF
ENDIF
ENDFOR
ENDIF
RETURN EMPTY(tcMsg)
ENDFUNC
```
Output:
```Output as in task description.
The last code is printed as BOO30A Vowels are not allowed.
```

## Wren

Library: Wren-str
Library: Wren-fmt
```import "/str" for Char
import "/fmt" for Conv

var sedol = Fn.new { |s|
if (!(s is String && s.count == 6)) return false
var weights = [1, 3, 1, 7, 3, 9]
var sum = 0
for (i in 0..5) {
var c = s[i]
if (!Char.isUpper(c) && !Char.isDigit(c)) return null
if ("AEIOU".contains(c)) return null
sum = sum + Conv.atoi(c, 36) * weights[i]
}
var cd = (10 - sum%10) % 10
return s + "%(cd)"
}

var tests = [
"710889",
"B0YBKJ",
"406566",
"B0YBLH",
"228276",
"B0YBKL",
"557910",
"B0YBKR",
"585284",
"B0YBKT",
"B00030",
"I23456"
]

for (test in tests) {
var a
var ans = (a = sedol.call(test)) ? a : "not valid"
System.print("%(test) -> %(ans)")
}
```
Output:
```B0YBKJ -> B0YBKJ7
406566 -> 4065663
B0YBLH -> B0YBLH2
228276 -> 2282765
B0YBKL -> B0YBKL9
557910 -> 5579107
B0YBKR -> B0YBKR5
585284 -> 5852842
B0YBKT -> B0YBKT7
B00030 -> B000300
I23456 -> not valid
```

## XPL0

```string 0;               \use zero-terminated strings

func CheckDigit(Str);   \Return the check digit for a SEDOL
char Str;
int  Sum, I, C, V;
[Sum:= 0;
for I:= 0 to 6-1 do
[C:= Str(I);
case of
C>=^0 & C<=^9: V:= C-^0;
C>=^A & C<=^Z: V:= C-^A+10
other V:= -1;
case I of
1, 4: V:= V*3;
3: V:= V*7;
5: V:= V*9
other     [];
Sum:= Sum+V;
];
return rem( (10 - rem(Sum/10)) / 10 ) + ^0;
];

int Sedol, N;
[Sedol:= ["710889",
"B0YBKJ",
"406566",
"B0YBLH",
"228276",
"B0YBKL",
"557910",
"B0YBKR",
"585284",
"B0YBKT",
"B00030"];
for N:= 0 to 11-1 do
[Text(0, Sedol(N));
ChOut(0, CheckDigit(Sedol(N)));
CrLf(0);
];
]```
Output:
```7108899
B0YBKJ7
4065663
B0YBLH2
2282765
B0YBKL9
5579107
B0YBKR5
5852842
B0YBKT7
B000300
```

## Yabasic

```data "710889", "B0YBKJ", "406566", "B0YBLH", "228276", "B0YBKL", "557910", "B0YBKR", "585284", "B0YBKT", "B00030", "AB", "B00A03", ""

do
if d\$ = "" break
print sedol\$(d\$)
loop

sub sedol\$(d\$)
LOCAL a, i, s, weights\$(1)

a = len(d\$)
if a < 6 or a > 6 return d\$ + ": Error in length"

for i = 1 to 6
if not instr("BCDFGHJKLMNPQRSTVWXYZ0123456789", mid\$(d\$, i, 1)) return d\$ + ": Error in symbol " + mid\$(d\$, i, 1)
next

a = token("1 3 1 7 3 9", weights\$())

FOR i = 1 TO 6
a = ASC(MID\$(d\$, i, 1)) - 48
s = s + (a + 3 * (a > 9)) * val(weights\$(i))
NEXT
return d\$ + CHR\$(48 + mod(10 - mod(s, 10), 10))
end sub```

## zkl

```fcn checksum(text){
( text.len()!=6 or (text..matches("*[AEIOUaeioua-z]*")) ) and
throw(Exception.ValueError("Invalid SEDOL text: "+text));

text + (10 - text.pump(List,'wrap(c){
if("0"<=c<="9") c.toAsc()-0x30;
else c.toAsc()-55;
}).zipWith('*,T(1,3,1,7,3,9)).sum() % 10) % 10;
}```

It sure does look like that trailing %10 is extraneous. It also seems like lower case is implicitly invalid.

```T("710889","B0YBKJ","406566","B0YBLH","228276",
"B0YBKL","557910","B0YBKR","585284","B0YBKT","B00030")
.apply(checksum).println();```
Output:
```L("7108899","B0YBKJ7","4065663","B0YBLH2","2282765","B0YBKL9",
"5579107","B0YBKR5","5852842","B0YBKT7","B000300")
```