1115.cpp

acm答案1048,1115,1002,1915,2201,2736

#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);
 }
}