//用fread和fwrite实现文件的复制
#include<stdio.h>
#include<stdlib.h>
void main()
{
      FILE *fp1;//源文件
      FILE *fp2;//目标文件
      char a[20];//原文件名
      char b[20];//目标文件名
      char c[100];
      int n;
      printf("请输入要拷贝的原文件名\n");
      scanf("%s",a);
      printf("请输入拷贝的目标文件名：\n");
      scanf("%s",b);
      fp1 = fopen(a,"r");
      if(!fp1)
      {
        printf("源文件不存在\n");
        exit(0);
      }
      fp2 = fopen(b,"w");
      if(!fp2)
      {
        printf("目标文件不存在\n");
        exit(0);
      }
     do
      {
        n = fread(c,1,100,fp1);
        fwrite(c,1,n,fp2);
      }while(n==100);
      printf("拷贝成功！\n");
      fclose(fp1);
      fclose(fp2);
}