UVa 10591 - Happy Number

	/**
	* Author : Md.Mehadi Hasan menon.
	* Problem : 10591 - Happy Number.
	* Status : Accepted.
	* Date : 13.10.2014.
	**/
	#include <stdio.h>
	int happyNumber(unsigned int num);
	int main()
	{
	unsigned int i, n, tc, a;
	scanf("%u", &tc);
	for(i = 1; i <= tc; i++)
	{
	scanf("%u", &n);
	a = happyNumber(n);
	if(a == 1)
	printf("Case #%u: %u is a Happy number.\n", i, n);
	else
	printf("Case #%u: %u is an Unhappy number.\n", i, n);
	}
	return 0;
	}
	int happyNumber(unsigned int num)
	{
	int digit, sum;
	sum = 0;
	while(num != 0)
	{
	digit = num % 10;
	sum = sum + (digit * digit);
	num = num / 10;
	}
	if(sum >= 10)
	happyNumber(sum);
	else
	return sum;
	}

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