C语言写文件

C语言写文件操作，先记录一下。

#include<stdio.h>
#define set_s (x,y) {strcoy(s[x].name,y);s[x].size=strlen(y);}
#define nmemb 3
struct test
{
    char name[20];
    int size;
}
s[nmemb];
main()
{
    FILE * stream;
    set_s(0,"Linux!");
    set_s(1,"FreeBSD!");
    set_s(2,"Windows2000.");
    stream=fopen("/tmp/fwrite","w");
    fwrite(s,sizeof(struct test),nmemb,stream);
    fclose(stream);
}