计算一个结构体student_type的变量

for(i=0;i<SIZE;i++)
   
scanf("%s%d%d%s",stud[i].name,&stud[i].num,&stud[i].age,
stud[i].addr);
    save();
   
printf("**********************************\n");
   
printf("这是刚才写到文件里的内容\n");
    output();
    return 0;
    }
   
/*save( )函数,将数据送到"stu_list"磁盘文件中去。*/
    void save()
    {
    FILE
*fp;
    int i;
    if((fp=fopen("stu_list","wb"))==NULL)
    {
   
printf("cannot open file\n");
    return;
    }
    /*函数sizeof
计算一个结构体student_type的变量长度29(10+2+2+15)字节*/
    for(i=0;i<SIZE;i++)
   
if(fwrite(&stud[i],sizeof(struct student_type),1,fp)!=1)
    printf("file
write error\n");
    }
    void output()
    {
    int i;
   
FILE *fp;
    fp=fopen("stu_list","rb");
    for(i=0;i<SIZE;i++)
   
{
    fread(&stud[i],sizeof(struct student_type),1,fp);
   
printf("%-10s%4d%4d %-15s\n",stud[i].name,
stud[i].num,stud[i].age,stud[i].addr);

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时间: 2024-08-26 21:15:26

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