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