c语言结构体数组指针传参问题

Question

为啥函数接收不到数据啊

#include<stdio.h>
#include<string.h>
#include<stdlib.h>
#define N 10
struct Student
{
    char name[20];
    float score[3];
}stu[3];
void Display(struct Student *a)
{
    printf("----信息如下----\n");
    printf("姓名:%s\n", a->name);
    printf("语文:%.2f\n", a->score[0]);
    printf("数学:%.2f\n", a->score[1]);
    printf("英语:%.2f\n", a->score[2]);
    printf("平均成绩:%.2f", (a->score[0] + a->score[1] + a->score[2]) / 3);
}
int main()
{
    int i;
    struct Student *p;
    p = &stu[0];
    for (i = 0; i<3; i++, p++)
    {
        printf("姓名:");
        scanf("%s", &stu[i].name);
        printf("\n");
        printf("语文:");
        scanf("%f", &stu[i].score[0]);
        printf("\n");
        printf("数学:");
        scanf("%f", &stu[i].score[1]);
        printf("\n");
        printf("英语:");
        scanf("%f",& stu[i].score[2]);
    }
    for (i = 0; i<3; i++, p++)
    {
        Display(p);
    }
    system("pause");
    return 0;
}


``
```c
void Display(struct Student a[],int i)
{
 printf("----信息如下----\n");
 printf("姓名:%s\n",a[i].name);
 printf("语文:%.2f\n",a[i].score[0]);
 printf("数学:%.2f\n",a[i].score[1]);
 printf("英语:%.2f\n",a[i].score[2]);
 printf("平均成绩:%.2f",(a[i].score[0]+a[i].score[1]+a[i].score[2])/3);
}

为啥指针传参不对，去掉指针就可以了下面是改的

Answer 1

原来代码里，指针 p 已经被 p++ ,已经指向了数组stu[]之外了，修改如下，改动处见注释，供参考：

#include<stdio.h>
#include<string.h>
#include<stdlib.h>
#define N 10
struct Student
{
    char  name[20];
    float score[3];
}stu[3];
void Display(struct Student* a)
{
    printf("----信息如下----\n");
    printf("姓名:%s\n", a->name);
    printf("语文:%.2f\n", a->score[0]);
    printf("数学:%.2f\n", a->score[1]);
    printf("英语:%.2f\n", a->score[2]);
    printf("平均成绩:%.2f", (a->score[0] + a->score[1] + a->score[2]) / 3);
}
void display(struct Student a[], int i)     //修改
{
    printf("----信息如下----\n");
    printf("姓名:%s\n", a[i].name);
    printf("语文:%.2f\n", a[i].score[0]);
    printf("数学:%.2f\n", a[i].score[1]);
    printf("英语:%.2f\n", a[i].score[2]);
    printf("平均成绩:%.2f", (a[i].score[0] + a[i].score[1] + a[i].score[2]) / 3);
}
int main()
{
    int i;
    struct Student* p;
    //p = &stu[0];       修改 这里没用到指针 p ,多余了
    for (i = 0; i < 3; i++)  //for (i = 0; i < 3; i++, p++) 修改  p++ 多余
    {
        printf("姓名:");
        scanf("%s", stu[i].name);  //scanf("%s", &stu[i].name); 修改
        printf("\n");
        printf("语文:");
        scanf("%f", &stu[i].score[0]);
        printf("\n");
        printf("数学:");
        scanf("%f", &stu[i].score[1]);
        printf("\n");
        printf("英语:");
        scanf("%f", &stu[i].score[2]);
    }
    for (i = 0, p = &stu[0]; i < 3; i++, p++)  // 修改
    {
        Display(p);
        display(stu, i);                       //修改
    }
    system("pause");
    return 0;
}