29 lines
855 B
Scala
29 lines
855 B
Scala
object Cusip extends App {
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val candidates = Seq("037833100", "17275R102", "38259P508", "594918104", "68389X106", "68389X105")
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for (candidate <- candidates)
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printf(f"$candidate%s -> ${if (isCusip(candidate)) "correct" else "incorrect"}%s%n")
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private def isCusip(s: String): Boolean = {
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if (s.length != 9) false
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else {
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var sum = 0
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for (i <- 0 until 7) {
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val c = s(i)
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var v = 0
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if (c >= '0' && c <= '9') v = c - 48
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else if (c >= 'A' && c <= 'Z') v = c - 55 // lower case letters apparently invalid
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else if (c == '*') v = 36
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else if (c == '@') v = 37
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else if (c == '#') v = 38
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else return false
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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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s(8) - 48 == (10 - (sum % 10)) % 10
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}
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}
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}
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