程序代码：

void save()
{
    FILE *fp;
    int i;
    if((fp=fopen("stu.dat","wb"))==NULL)
    {
        printf("cannot open file\n");
        return;
    }
    for(i=0;i<10;i++)

        if(fwrite(&stud[i],sizeof(struct Student_type),1,fp)!=1)
            printf("file write error\n");
        fclose(fp);
}