#include<stdio.h>
int n;
void find_digitalroot()
{	
	int sum=100,count=0;
	while(sum>=10)
	{
		
		if(count>=1)
			n=sum;	
		sum=0;
		while(n>0)
		{
			sum+=n%10;
			n/=10;
		}
		count++;
         }
	printf("%d\n",sum);
}
int main()
{
	scanf("%d",&n);
	while(n!=0)
	{
		find_digitalroot();
		scanf("%d",&n);
	}
	return 0;
}

• 用串读， int 太小了， (413) peanutgyz 2004-05-11 22:43:40