#include <stdio.h>

int main(int argc, const char *argv[])

{

    FILE *fp = NULL;

    fp = fopen(argv[],"w");

    if(fp == NULL)

    {

        perror("fail open :");

        return -;

    }

    int a[] = {,,,}; //二进制流

    fwrite(a,sizeof(int),sizeof(a)/sizeof(int),fp);//写二进制流

    fclose(fp); //写完，关闭，再以只读方式打开

    fp = fopen(argv[],"r"); //以只读方式打开

    if(fp == NULL)

    {

        perror("fail open :");

        return -;

    }

    int b[] = {};

    fread(b,sizeof(int),,fp);

    int i=;

    for(i=;i<;i++)

    {

        printf("%d ",b[i]);

    }

    fclose(fp);

    return ;

}

#include <stdio.h>

int main(int argc, const char *argv[])

{

    FILE *fp_w = NULL;

    FILE *fp_r = NULL;

    fp_r = fopen(argv[],"r"); //读

    if(fp_r==NULL)

    {

        perror("r fail :");

        return -;

    }

    fp_w = fopen(argv[],"w");//写

    if(fp_w==NULL)

    {

        perror("w fail :");

        return -;

    }

    char a[] = {};

    while()

    {

        //fread返回值，成功返回读取的个数，失败，返回EOF（-1），读取0个已经读到文件结束了

        if(fread(a,sizeof(char),sizeof(a)/sizeof(char),fp_r) == )

        {

            perror("fread fail : ");

            break;

        }

        fwrite(a,sizeof(char),sizeof(a)/sizeof(char),fp_w); //写数据到文件

    }

    puts("cp done");

    fclose(fp_w); //关闭文件

    fclose(fp_r);

    return ;

}