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tomazi's solution for 100: SumItUp, written in Java, submitted on 09.05.2010 11:22:12
public class SumItUp { public int sum(int N) { int a = sumNumbers(N); while(a >= 10){ a = sumNumbers(a); } return a; } int sumNumbers(int a) { int s = 0; while (a > 0) { s += a % 10; a /= 10; } return s; } }