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CUSIP

From Rosetta Code
CUSIP is a draft programming task. It is not yet considered ready to be promoted as a complete task, for reasons that should be found in its talk page.
This page uses content from Wikipedia. The original article was at CUSIP. The list of authors can be seen in the page history. As with Rosetta Code, the text of Wikipedia is available under the GNU FDL. (See links for details on variance)


A CUSIP is a nine-character alphanumeric code that identifies a North American financial security for the purposes of facilitating clearing and settlement of trades. The CUSIP was adopted as an American National Standard under Accredited Standards X9.6.

The task here is to ensure the last digit (i.e. check digit) of the CUSIP code is correct, against the following codes.

  • Apple Inc.: 037833100
  • Cisco Systems: 17275R102
  • Google Inc.: 38259P508
  • Microsoft Corporation: 594918104
  • Oracle Corporation (Incorrect): 68389X106
  • Oracle Corporation: 68389X105


Example pseudo-code below.
algorithm Cusip-Check-Digit(cusip) is
Input: an 8-character CUSIP
 
sum := 0
for 1 ≤ i ≤ 8 do
c := the ith character of cusip
if c is a digit then
v := numeric value of the digit c
else if c is a letter then
p := ordinal position of c in the alphabet (A=1, B=2...)
v := p + 9
else if c = "*" then
v := 36
else if c = "@" then
v := 37
else if' c = "#" then
v := 38
end if
if i is even then
v := v × 2
end if
 
sum := sum + int ( v div 10 ) + v mod 10
repeat
 
return (10 - (sum mod 10)) mod 10
end function
See also

ALGOL 68[edit]

BEGIN
# returns TRUE if cusip is a valid CUSIP code #
OP ISCUSIP = ( STRING cusip )BOOL:
IF ( UPB cusip - LWB cusip ) /= 8
THEN
# code is wrong length #
FALSE
ELSE
# string is 9 characters long - check it is valid #
STRING cusip digits = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ*@#"[ AT 0 ];
INT check digit := 0;
IF NOT char in string( cusip[ UPB cusip ], check digit, cusip digits )
THEN
# invalid check digit #
FALSE
ELSE
# OK so far compare the calculated check sum to the supplied one #
INT sum := 0;
INT c pos := LWB cusip - 1;
FOR i TO 8 DO
INT digit := 0;
IF NOT char in string( cusip[ i + c pos ], digit, cusip digits )
THEN
# invalid digit #
digit := -999
FI;
IF NOT ODD i
THEN
# even digit #
digit *:= 2
FI;
sum +:= ( digit OVER 10 ) + ( digit MOD 10 )
OD;
( 10 - ( sum MOD 10 ) ) MOD 10 = check digit
FI
FI ; # ISCUSIP #
 
# task test cases #
 
PROC test cusip = ( STRING cusip )VOID:
print( ( cusip, IF ISCUSIP cusip THEN " valid" ELSE " invalid" FI, newline ) );
 
test cusip( "037833100" );
test cusip( "17275R102" );
test cusip( "38259P508" );
test cusip( "594918104" );
test cusip( "68389X106" );
test cusip( "68389X105" )
END
Output:
037833100 valid
17275R102 valid
38259P508 valid
594918104 valid
68389X106 invalid
68389X105 valid

ALGOL W[edit]

Based on Algol 68

begin    % returns true if cusip is a valid CUSIP code %
logical procedure isCusip ( string(9) value cusip ) ;
begin
 % returns the base 39 digit corresponding to a character of a CUSIP code %
integer procedure cusipDigit( string(1) value cChar ) ;
if cChar >= "0" and cChar <= "9" then ( decode( cChar ) - decode( "0" ) )
else if cChar >= "A" and cChar <= "Z" then ( decode( cChar ) - decode( "A" ) ) + 10
else if cChar = "*" then 36
else if cChar = "@" then 37
else if cChar = "#" then 38
else  % invalid digit % -999 ;
 
integer checkDigit, sum;
checkDigit := cusipDigit( cusip( 8 // 1 ) );
for cPos := 1 until 8 do begin
integer digit;
digit := cusipDigit( cusip( ( cPos - 1 ) // 1 ) );
if not odd( cPos ) then digit := digit * 2;
sum := sum + ( digit div 10 ) + ( digit rem 10 )
end for_cPos ;
( ( 10 - ( sum rem 10 ) ) rem 10 ) = checkDigit
end isCusip ;
 
begin % task test cases %
procedure testCusip ( string(9) value cusip ) ;
write( s_w := 0, cusip, if isCusip( cusip ) then " valid" else " invalid" );
 
testCusip( "037833100" );
testCusip( "17275R102" );
testCusip( "38259P508" );
testCusip( "594918104" );
testCusip( "68389X106" );
testCusip( "68389X105" )
end testCases
end.
Output:
037833100 valid
17275R102 valid
38259P508 valid
594918104 valid
68389X106 invalid
68389X105 valid

AWK[edit]

 
# syntax: GAWK -f CUSIP.AWK
BEGIN {
n = split("037833100,17275R102,38259P508,594918104,68389X106,68389X105",arr,",")
for (i=1; i<=n; i++) {
printf("%9s %s\n",arr[i],cusip(arr[i]))
}
exit(0)
}
function cusip(n, c,i,sum,v,x) {
# returns: 1=OK, 0=NG, -1=bad data
if (length(n) != 9) {
return(-1)
}
for (i=1; i<=8; i++) {
c = substr(n,i,1)
if (c ~ /[0-9]/) {
v = c
}
else if (c ~ /[A-Z]/) {
v = index("ABCDEFGHIJKLMNOPQRSTUVWXYZ",c) + 9
}
else if (c == "*") {
v = 36
}
else if (c == "@") {
v = 37
}
else if (c == "#") {
v = 38
}
else {
return(-1)
}
if (i ~ /[02468]/) {
v *= 2
}
sum += int(v / 10) + (v % 10)
}
x = (10 - (sum % 10)) % 10
return(substr(n,9,1) == x ? 1 : 0)
}
 
Output:
037833100 1
17275R102 1
38259P508 1
594918104 1
68389X106 0
68389X105 1

Caché ObjectScript[edit]

Class Utils.Check [ Abstract ]
{
 
ClassMethod CUSIP(x As %String) As %Boolean
{
SET x=$TRANSLATE(x," ")
// https://leiq.bus.umich.edu/res_codes_cusip.htm
IF x'?8UNP1N QUIT 0
SET cd=$EXTRACT(x,*), x=$EXTRACT(x,1,*-1), t=0
FOR i=1:1:$LENGTH(x) {
SET n=$EXTRACT(x,i)
IF n'=+n SET n=$CASE(n,"*":36,"@":37,"#":38,:$ASCII(n)-55)
IF i#2=0 SET n=n*2
SET t=t+(n\10)+(n#10)
}
QUIT cd=((10-(t#10))#10)
}
 
}
Examples:
USER>For  { Read s Quit:s=""  Write ": "_##class(Utils.Check).CUSIP(s), ! }         
037833100: 1
17275R102: 1
38259P508: 1
594918104: 1
68389X106: 0
68389X105: 1

USER>

Kotlin[edit]

// version 1.1.0
 
fun isCusip(s: String): Boolean {
if (s.length != 9) return false
var sum = 0
for (i in 0..7) {
val c = s[i]
var v = when (c) {
in '0'..'9' -> c.toInt() - 48
in 'A'..'Z' -> c.toInt() - 64 // lower case letters apparently invalid
'*' -> 36
'@' -> 37
'#' -> 38
else -> return false
}
if (i % 2 == 1) v *= 2 // check if odd as using 0-based indexing
sum += v / 10 + v % 10
}
return s[8].toInt() - 48 == (10 - (sum % 10)) % 10
}
 
fun main(args: Array<String>) {
val candidates = listOf(
"037833100",
"17275R102",
"38259P508",
"594918104",
"68389X106",
"68389X105"
)
for (candidate in candidates)
println("$candidate -> ${if(isCusip(candidate)) "correct" else "incorrect"}")
}
Output:
037833100 -> correct
17275R102 -> correct
38259P508 -> correct
594918104 -> correct
68389X106 -> incorrect
68389X105 -> correct

Perl 6[edit]

Works with: Rakudo version 2017.01
sub divmod ($v, $r) { $v div $r, $v mod $r }
my %chr = (flat 0..9, 'A'..'Z', <* @ #>) Z=> 0..*;
 
sub cuisp-check ($cuisp where *.chars == 9) {
my ($code, $chk) = $cuisp.comb(8);
my $sum = [+] $code.comb.kv.map: { [+] (($^k % 2 + 1) * %chr{$^v}).&divmod(10) };
so (10 - $sum mod 10) mod 10 eq $chk;
}
 
# TESTING
say "$_: ", $_.&cuisp-check for <
037833100
17275R102
38259P508
594918104
68389X106
68389X105
>
Output:
037833100: True
17275R102: True
38259P508: True
594918104: True
68389X106: False
68389X105: True

Racket[edit]

#lang racket
(require srfi/14)
 
(define 0-char (char->integer #\0))
(define A-char (char->integer #\A))
 
(define (cusip-value c)
(cond
[(char-set-contains? char-set:digit c)
(- (char->integer c) 0-char)]
[(char-set-contains? char-set:upper-case c)
(+ 10 (- (char->integer c) A-char))]
[(char=? c #\*) 36]
[(char=? c #\@) 37]
[(char=? c #\#) 38]))
 
(define (cusip-check-digit cusip)
(modulo
(- 10
(modulo
(for/sum
((i (sequence-map add1 (in-range 8))) (c (in-string cusip)))
(let* ((v (cusip-value c)) (v′ (if (even? i) (* v 2) v)))
(+ (quotient v′ 10) (modulo v′ 10)))) 10)) 10))
 
(define (CUSIP? s)
(char=? (string-ref s (sub1 (string-length s)))
(integer->char (+ 0-char (cusip-check-digit s)))))
 
(module+ test
(require rackunit)
(check-true (CUSIP? "037833100"))
(check-true (CUSIP? "17275R102"))
(check-true (CUSIP? "38259P508"))
(check-true (CUSIP? "594918104"))
(check-false (CUSIP? "68389X106"))
(check-true (CUSIP? "68389X105")))

no output indicates all tests passed.

zkl[edit]

fcn cusipCheckDigit(cusip){
var [const] vs=[0..9].chain(["A".."Z"],T("*","@","#")).pump(String);
try{
sum:=Walker.cycle(1,2).zipWith(fcn(n,c){ v:=vs.index(c)*n; v/10 + v%10 },
cusip[0,8]).reduce('+);
((10 - sum%10)%10 == cusip[8].toInt()) and cusip.len()==9
}catch{ False }
}
foreach cusip in (T("037833100", "17275R102",
"38259P508", "594918104", "68389X106", "68389X105")){
println(cusip,": ",cusipCheckDigit(cusip));
}
Output:
037833100: True
17275R102: True
38259P508: True
594918104: True
68389X106: False
68389X105: True