41 lines
1.3 KiB
Groovy
41 lines
1.3 KiB
Groovy
class Cusip {
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private static Boolean isCusip(String s) {
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if (s.length() != 9) return false
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int sum = 0
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for (int i = 0; i <= 7; i++) {
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char c = s.charAt(i)
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int v
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if (c >= ('0' as char) && c <= ('9' as char)) {
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v = c - 48
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} else if (c >= ('A' as char) && c <= ('Z' as char)) {
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v = c - 55 // lower case letters apparently invalid
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} else if (c == '*' as char) {
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v = 36
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} else if (c == '@' as char) {
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v = 37
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} else if (c == '#' as char) {
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v = 38
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} else {
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return false
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}
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if (i % 2 == 1) v *= 2 // check if odd as using 0-based indexing
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sum += v / 10 + v % 10
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}
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return s.charAt(8) - 48 == (10 - (sum % 10)) % 10
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}
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static void main(String[] args) {
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List<String> candidates=new ArrayList<>()
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candidates.add("037833100")
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candidates.add("17275R102")
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candidates.add("38259P508")
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candidates.add("594918104")
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candidates.add("68389X106")
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candidates.add("68389X105")
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for (String candidate : candidates) {
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System.out.printf("%s -> %s%n", candidate, isCusip(candidate) ? "correct" : "incorrect")
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}
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}
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}
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