ZOJ Problem 1115 Digital Roots

/*
必须用字符串来处理，测试数据会很大
*/

#include <stdio.h>
#include <string.h>

int main(){
char s[1000],*p;
int n;
while(scanf("%s",s)!=EOF){
if(strcmp(s,"0")==0)
break;

while(strlen(s)>1){
for(n=0,p=s;*p;p++)
n+=*p-'0';
sprintf(s,"%d",n);
}
printf("%s/n",s);
}
}