25 lines
660 B
C#
25 lines
660 B
C#
using System;
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using System.Linq;
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class Program
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{
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static Tuple<int, int> DigitalRoot(long num)
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{
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int additivepersistence = 0;
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while (num > 9)
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{
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num = num.ToString().ToCharArray().Sum(x => x - '0');
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additivepersistence++;
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}
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return new Tuple<int, int>(additivepersistence, (int)num);
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}
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static void Main(string[] args)
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{
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foreach (long num in new long[] { 627615, 39390, 588225, 393900588225 })
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{
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var t = DigitalRoot(num);
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Console.WriteLine("{0} has additive persistence {1} and digital root {2}", num, t.Item1, t.Item2);
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}
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}
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}
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