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igorkulev's solution for 100: SumItUp, written in Java, submitted on 09.05.2010 11:21:54
public class SumItUp { public static void main(String[] args) { } int calculate(int num) { String str = Integer.toString(num); int a = 0; for (int i=0;i<str.length();i++) { a += (int)((int)(str.charAt(i))-(int)('0')); } if (a >= 10) { return calculate(a); } else { return a; } } public int sum(int N) { int answer = calculate(N); return answer; } }