# include <stdio.h>
# include <string.h>
struct student
{
    int ID;
    char name[32];
    int age;
    char sex[4];
};
int main (void)
{
    int i = 0 ;
    struct student a , b , *pb;
    scanf ("%d %d %s %s" , &a.ID , &a.age , a.name , a.sex);
    while (a.age > 0)
    {
        FILE * p = fopen ("Amyfile.txt" , "a+");
        if (p == 0)
            printf ("打开文件失败……");
   
            fprintf (p , "%d %d %s %s\n" ,a.ID , a.age , a.name , a.sex);
            scanf ("%d %d %s %s" , &a.ID , &a.age , a.name , a.sex);
            fclose (p);
    }
    FILE * p = fopen ("Amyfile.txt" , "r+");
        if (p == 0)
            printf ("打开文件失败……");
        rewind (p);
        pb = &b;
        clearerr (p);
        while (!feof (p))
        {
            fscanf (p , "%d %d %s %s" , &pb->ID , &pb->age , pb->name , pb->sex);
            printf ( "%d %d %s %s" , pb->ID , pb->age , pb->name , pb->sex);
            printf ("\n");
        }
        fclose (p);
        
   
    return 0;
}

这个为什么到最后总是会崩掉