C：判断素数;

#include <stdio.h>

int main(){
  int m, i;
  scanf("&d",m);
  for(i=2;i<=m;i++)
    if(m%i==0)
    break;
  if(i>m/2&&m!=1)
  printf("%d is a prime number!n",m);
  else
  printf("No"n);

  return 0;
}