计数循环的控制

#include<stdio.h>
  main()
  {
      int i,n;
      long p=1;
      printf("Please enter n:");
      scanf("%d",&n);
      for (i=1;i<=n;i++)
      {
      p=p*i;
      }
      printf("%d!=%1d\n",n,p);
  }