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gorgiRankovski's solution for 100: SumItUp, written in Java, submitted on 09.05.2010 11:29:10
public class SumItUp { public int sum(int N) { int rez=0; boolean z=true; int n=N; while(z) { String digits=Integer.toString(n); rez=0; for(int i=0;i<digits.length();i++) { rez+=Integer.parseInt(digits.substring(i, i+1)); } if(rez<10) {break;} n=rez; } return rez; } }