#include<stdio.h>
#include<stdlib.h>
typedef struct student
{
    int num;
    char name[10];
    char addr[15];
    struct student *next;
}Stu;

int main()
{
    void input(Stu *head);
    void print(Stu *out);
    int flag;
    Stu *Q;
   
star:    printf("\n\n1.输入学生信息\t\t\t2.显示学生信息\t\t\t0.退出\n");
        printf("请您选择序号:");
        scanf("%d",&flag);
        switch(flag)
        {
        case 0:return 0;
        case 1:
            input(Q);
            goto star;
            break;
        case 2:print(Q);
            goto star;
            break;
        }
}

void input(Stu *head)
{
    Stu *p1,*p2;
    int flag=1,n=0;
    p1=p2=(Stu*)malloc(sizeof(Stu));
    while(flag)
    {
        printf("请您输入学号:");
        scanf("%d",&p1->num);
        printf("请您输入姓名:");
        scanf("%s",p1->name);
        printf("请您输入地址:");
        scanf("%s",p1->addr);
        n=n+1;
        if(n==1)
            head=p1;
        else
            p2->next=p1;
        p2=p1;
        p1=(Stu*)malloc(sizeof(Stu));
        printf("是否继续输入(1/0):");
        scanf("%d",&flag);
    }
    p2->next=NULL;
}

void print(Stu *out)
{
    Stu *p;
    p=out;
    if(out!=NULL)
        printf("无学生信息!\n");
    else
    {
        printf("学生信息为:\n");
        while(p!=NULL)
        {
            printf("学号    姓名    地址\n");
            printf("%-8d%-8s%-8s\n",p->num,p->name,p->addr);
            p=p->next;
        }
    }
}

既然是指针，head是头指针，Q也应该是头指针，然后也应该输出后面的内容勒，大神，详细讲哈原因，纠结这个好久了

大神，为什么同样的，这种又可以带回地址呢？
#include<stdio.h>
#include<stdlib.h>
typedef struct student
{
    int num;
    char name[10];
    char addr[15];
    struct student *next;
}Stu;

int main()
{
    void input(Stu *head);
    void print(Stu *out);
    int flag;
    Stu *Q;
    Q=(Stu*)malloc(sizeof(Stu));
    Q->next=NULL;
star:    printf("\n\n1.输入学生信息\t\t\t2.显示学生信息\t\t\t0.退出\n");
        printf("请您选择序号:");
        scanf("%d",&flag);
        switch(flag)
        {
        case 0:return 0;
        case 1:
            input(Q);
            system("cls");
            goto star;
            break;
        case 2:
            print(Q);
            goto star;
            break;
        }
}

void input(Stu *head)
{
    Stu *s;
    int flag=1,n=0;
    s=(Stu*)malloc(sizeof(Stu));
    while(flag)
    {
        printf("请您输入学号:");
        scanf("%d",&s->num);
        printf("请您输入姓名:");
        scanf("%s",s->name);
        printf("请您输入地址:");
        scanf("%s",s->addr);
        s->next=head->next;
        head->next=s;
        s=(Stu*)malloc(sizeof(Stu));
        printf("是否继续输入(1/0):");
        scanf("%d",&flag);
    }
}

void print(Stu *out)
{
    if(out->next==NULL)
        printf("无学生信息!\n");
    else
    {
        printf("学生信息为:\n");
        while(out->next!=NULL)
        {
            out=out->next;
            printf("学号    姓名    地址\n");
            printf("%-8d%-8s%-8s\n",out->num,out->name,out->addr);
            
        }
    }
}

我的那个程序输出功能都在单独的子函数里面，然后都是在主函数调用，你写的那个交换第一个是在主函数里面进行交换，我还是没弄明白

谢谢大神！这样返回头指针肯定是行的，我就在想到底我那种是哪里有问题，想不通啊