学习fread、fwrite函数

一个拷贝的小程序

#include <stdio.h>
#include <string.h>

#define BUF_SIZE 1000
int main()
{
    FILE *fp_src,*fp_dst;
    size_t readed;
    char buf[BUF_SIZE];
    memset(buf,0,BUF_SIZE);
    if((fp_src=fopen("/root/test","rb"))==NULL)
    {
            fprintf(stderr,"open file1 failure!
");
    }
    if((fp_dst=fopen("/root/test2","wb"))==NULL)
    {
            fprintf(stderr,"open file2 failure!
");
    }
    while (!feof(fp_src)) {
        readed=fread(buf,sizeof(char),BUF_SIZE,fp_src);
        if(fwrite(buf,sizeof(char),BUF_SIZE,fp_dst)<readed)
        {
            //write file error! exit
            fprintf(stderr,"write file2 fialure!
");
            return 0;
        }
    }
    fclose(fp_src);
    fclose(fp_dst);
    printf("copy test to test2 success! 
");
    return 0;
}