#include<stdio.h>
#include<stdlib.h>
#define N 3

struct student
{
    int no;
    char name[20];
    char sex;
    int age;
    float score;
}stu[N],*st;


void enter()
{
    int i;
    void menu();
    void save();
    printf("请输入学生信息:\n");
    printf("no\tname\tsex\tage\tscore\n");
    for(i=0;i<N;i++)
    {
        scanf("%d-%s-%c-%d-%lf",&stu[i].no,&stu[i].name,&stu[i].sex,&stu[i].age,&stu[i].score);
        
    }
    if(N!=0)
        save(N);
    getchar();
    getchar();
    menu();
   
}

void save()
{
    int i;
    FILE *fp;
    if(!(fp = fopen("student-heng","wb")))
    {
        printf("Cannot open student-heng!\n");
        exit(0);
    }
    for(i=0;i<N;i++)
    {
        fwrite(&stu[i],sizeof(struct student),1,fp);
    }
    fclose(fp);
}

void load()
{
    FILE *fp;
    int i;
    if(!(fopen("student-heng","rb")))
    {
        printf("Cannot open student-heng!\n");
        exit(0);
    }
    for(i=0;i<N;i++)
    {
        fread(&stu[i],sizeof(struct student),1,fp);
        return 0;
    }
    fclose(fp);
}

void menu()
{
    while(1)
    {
        int x;
        printf("------------操作选项-------------\n");
        printf("1:返回菜单\n");
        printf("2:读入数据\n");
        printf("3:查找数据\n");
        printf("4:结束程序\n");
        printf("---------------------------------\n");
        printf("选择操作:",x);
        scanf("%d",&x);
        if(x==4)
            break;
        switch(x)
        {
        case 1:
            break;
        case 2:
            enter();
            break;
        case 3:
            load();
            break;
        default:
            printf("操作不正确");
            break;
        }
    }
}

int main()
{
    menu();
    return 0;
}
为什么执行 操作三load()操作的时候显示 "10.exe已停止工作",请大神指教