大整数取模

#include "stdio.h"
#include "string.h"
int main()
{
  char n[1000]
  int m
  scanf("%s",&n)
  scanf("%d",&m)
  int ans=0,i
  int len=strlen(n)
  for(i=0i<leni++)
   ans=(int)((long long)ans*10+n[i])%m)
  printf("%d",ans)
  return 0
}