freadandfwrite文件读写.txt

c语言中fread fwrite的实现

#include<stdio.h>
#define SIZE 2
#define null 0
struct student
{
    char name[20];
    int num;
    int age;
    char addar[20];
}stu[SIZE];

int  print()
{
    int i;
    FILE *fp;
    if((fp=fopen("a.txt","rb"))==null)		
	{
		printf("文件打开错误！\n");
		return 0;
	}
    for(i=0;i<SIZE;i++)
	{
		fread(&stu[i],sizeof(struct student),1,fp);
		printf("%-10s  %4d  %4d  %-15s\n",stu[i].name,stu[i].num,stu[i].age,stu[i].addar);
	}
  
	fclose(fp);
    return 0;
}

int save()
{
	int i;
	FILE *fp;
	if((fp=fopen("a.txt","wb"))==null)
	{
		printf("文件打开错误！\n");
		return 0;
	}
	for(i=0;i<SIZE;i++)
	{
		fwrite(&stu[i],sizeof(struct student),1,fp);
	}
	fclose(fp);
	return 0;
}
 int main()
 {
	 int i;
	 printf("请输入姓名、学号、年龄、地址\n");
	 for(i=0;i<SIZE;i++)
	 {
		scanf("%s%d%d%s",stu[i].name,&stu[i].num,&stu[i].age,stu[i].addar);
	 }
	 save();
	 print();
	 return 0;
 }