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Goran's solution for 100: SumItUp, written in Java, submitted on 09.05.2010 12:10:03
public class SumItUp { public int sum(int N) { if(N>=1 && N<=9) return N; int b=N, s=0; while(true){ s = func(b); if(s<10) return s; b = s; } } public int func(int n){ int sum=0; while(n>0){ sum += n%10; n/=10; } return sum; } }