UVa 11332 - Summing Digits

	/**
	* Author : Md.Mehadi Hasan Menon.
	* Problem : 11332 - Summing Digits.
	* Satus : Accepted.
	* Date : 10.10.2014.
	**/
	#include <stdio.h>
	int digitSum(long long int a);
	int main()
	{
	long long int n;
	int ans;
	while(scanf("%lld", &n) == 1 && n != 0)
	{
	if(n < 10)
	printf("%lld\n", n);
	else
	{
	ans = digitSum(n);
	while(ans >= 10)
	{
	ans = digitSum(ans);
	}
	printf("%d\n", ans);
	}
	}
	return 0;
	}
	int digitSum(long long int a)
	{
	int sum;
	sum = 0;
	while(a != 0)
	{
	sum = sum + a % 10;
	a = a / 10;
	}
	return sum;
	}

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