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Task/CUSIP/00-TASK.txt

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+<br/>
+
+A &nbsp; '''CUSIP''' &nbsp; 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.
+
+
+;Task:
+Ensure the last digit &nbsp; (i.e., the &nbsp; ''check digit'') &nbsp; of the '''CUSIP''' code (the 1<sup>st</sup> column) is correct, against the following:
+* &nbsp;  037833100   &nbsp; &nbsp; &nbsp;   Apple Incorporated       
+* &nbsp;  17275R102   &nbsp; &nbsp; &nbsp;   Cisco Systems   
+* &nbsp;  38259P508   &nbsp; &nbsp; &nbsp;   Google Incorporated  
+* &nbsp;  594918104   &nbsp; &nbsp; &nbsp;   Microsoft Corporation   
+* &nbsp;  68389X106   &nbsp; &nbsp; &nbsp;   Oracle Corporation &nbsp; (''incorrect'')
+* &nbsp;  68389X105   &nbsp; &nbsp; &nbsp;   Oracle Corporation    
+
+
+;Example pseudo-code below.
+<syntaxhighlight lang=text>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</syntaxhighlight>
+
+;See related tasks: 
+* [[SEDOLs|SEDOL]]
+* [[Validate_International_Securities_Identification_Number|ISIN]]
+<br>
+