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alpetrovski's solution for 100: SumItUp, written in Java, submitted on 09.05.2010 11:18:50
public class SumItUp { public int sum(int N) { int n = N; int a = 0; while(n>0) { a = a + (n%10); n=n/10; } if(a>9) { return sum(a); } else { return a; } } }