用fread和fwrite实现文件复制操作

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int main(int argc,char **argv)
{
    FILE *fp_src,*fp_des;
    char buf[128];
    int num;
    if(argc!=3)
    {
        printf("the format must be: cp_example file_src file_des\n");
        exit(EXIT_FAILURE);
    }
    if((fp_src=fopen(argv[1],"r"))==NULL)
    {
        perror("fopen1");
        exit(EXIT_FAILURE);
    }
    if((fp_des=fopen(argv[2],"w"))==NULL)
    {
        perror("fopen2");
        exit(EXIT_FAILURE);
    }
    do
    {
        num=fread(buf,1,128,fp_src);
        fwrite(buf,1,num,fp_des);
        if(feof(fp_src)==1)
            break;
    }while(1);
    fclose(fp_src);
    fclose(fp_des);
}