leetcode第202题-Happy Number

#include<stdio.h>
#include<stdlib.h>

bool isHappy(int n) 
{
    while(n>6)
	{
		int sum=0;
		while(n)
		{
			sum+=(n%10)*(n%10);
			n/=10;
		}
		n=sum;
	}
	return n==1;
}

int main()
{
	int m;
	while(scanf("%d",&m)!=EOF)
	{
		bool flag=isHappy(m);
		if(flag)
			printf("yes\n");
		else
			printf("no\n");
	}
	return 0;
}