CUSIP

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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.

<lang>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</lang>

See also

SEDOL
ISIN

Caché ObjectScript

<lang cos>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) }

}</lang>

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>