29 lines
701 B
Text
29 lines
701 B
Text
import system'routines;
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import extensions;
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MiddleThreeDigits(int n)
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{
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string s := n.Absolute.toString();
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int len := s.Length;
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if(len<3)
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{
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InvalidArgumentException.new("n must have 3 digits or more").raise()
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}
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else if(len.isEven())
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{
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InvalidArgumentException.new("n must have an odd number of digits").raise()
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};
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int mid := len / 2;
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^ s.Substring(mid-1,3)
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}
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public Program()
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{
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new int[]{123, 12345, 1234567, 987654321, 10001, -10001, -123, -100, 100, -12345, 1, 2, -1, -10, 2002, -2002, 0}
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.forEach::(n)
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{
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Console.printLine("middleThreeDigits(",n,"):",MiddleThreeDigits(n) \\ on::(e => e.Message))
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}
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}
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