fwr.c

linux unix 入门代码上,是关于初级入门的,经典代码

#include <stdio.h>

struct stu_r {
	int id;
	char name[64];
	int chinese;
	int english;
	int math;
};

int
main()
{
	struct stu_r stu[10];
	int i,ret;
	FILE *fp;

	for (i=0;i<10;i++) {
		stu[i].id=10001+i;
		sprintf(stu[i].name,"Stu%d",i);
		stu[i].chinese=rand()%100;
		stu[i].english=rand()%100;
		stu[i].math=rand()%100;
	}

	fp=fopen("/tmp/score","wb");
	if (fp==NULL) {
		perror("fopen()");
		exit(1);
	}

	ret=fwrite(stu,sizeof(struct stu_r),10,fp);
	if (ret<10) {
		fprintf(stderr,"Only %d items saved.\n",ret);
	} else {
		fprintf(stderr,"Saved.\n");
	}

	fclose(fp);

	exit(0);
}