16 lines
523 B
Nim
16 lines
523 B
Nim
import math
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proc middleThreeDigits(i): auto =
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var s = $abs(i)
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if s.len < 3 or s.len mod 2 == 0:
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raise newException(ValueError, "Need odd and >= 3 digits")
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let mid = s.len div 2
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return s[mid-1..mid+1]
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const passing = @[123, 12345, 1234567, 987654321, 10001, -10001, -123, -100, 100, -12345]
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const failing = @[1, 2, -1, -10, 2002, -2002, 0]
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for i in passing & failing:
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var answer = try: middleThreeDigits(i)
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except ValueError: getCurrentExceptionMsg()
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echo "middleThreeDigits(",i,") returned: ",answer
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