找不到问题的所在了，求支援

问题遇到的现象和发生背景

在显示功能时就会出错
在显示那个功能上第一步就凉凉了
printf("姓名：%s\t",pTemp->name);
printf("性别：%s\t",pTemp->sex);
printf("编号：%d\t",pTemp->num);
printf("身份:%s\t",pTemp->identity);
if(strcmp(pTemp->identity,"学生")==0)

问题相关代码，请勿粘贴截图

//设计一个程序，可以统计学校中所有人员（学生和老诗）的数据，学生的数据包括身份姓名编号性别和班级
//老诗的数据包括身份姓名编号性别和职务。
//分析统计数据结构体，只有一个数据不相同共用体
//程序功能存储和显示搜索
#define _CRT_SECURE_NO_WARNINGS
#include
#include
#include
int count;
//定义数据包
typedef union type
{
char duty[20];
char classroom[20];
}T;
typedef struct Data
{
char name[20];
char sex[20];
char identity[20];
int num;
T s;
// 加入链节点
struct Data *pNext;
}D;
D Add(DpHead)
{
int i=0;
D *pNew;
D *pEnd;
count=0;
//设置起点

pNew=pEnd=(D*)malloc(sizeof(D));
printf("输入你要录入的信息\n");
printf("姓名:");
scanf("%s",&pNew->name);
getchar();
printf("性别:");
scanf("%s",&pNew->sex);
getchar();
printf("身份:");
printf("请输入“学生”或者“老诗”\n");
scanf("%s",&pNew->identity);
getchar();
printf("编号:");
scanf("%s",&pNew->sex);
getchar();
if(strcmp(pNew->identity,"学生")==0)
{
    printf("输入班级：");
    scanf("%s",&pNew->s.classroom);    
}
else if(strcmp(pNew->identity,"老诗")==0)
{
    printf("输入职务:");
    scanf("%s",&pNew->s.duty);
}
while(1)
{
    int n;
    count++;
    printf("非0继续，0.退出\n");
    printf("输入你选的功能\n");
    scanf("%d",&n);
    if(n==0)
    {
        printf("退出\n");
        break;
    }
    else
    {
        //判断是否为第一次存入
        if(count==1)
        {
            //首节点与为节点相同
            pNew->pNext=pHead;
            pHead=pNew;
            pEnd=pNew;
        }
        else
        {
            //已存入资料将指向新录入的节点作为尾节点并指向NULL
            pNew->pNext=NULL;
            pEnd->pNext=pNew;
            pEnd=pNew;
        }
        getchar();
        pNew=(D*)malloc(sizeof(D));
        printf("输入你要录入的信息\n");
        printf("姓名:");
        scanf("%s",&pNew->name);
        getchar();
        printf("性别:");
        scanf("%s",&pNew->sex);
        getchar();
        printf("身份:\n");
        printf("请输入“学生”或者“老诗”\n");

        scanf("%s",&pNew->identity);
        getchar();
        printf("编号:");
        scanf("%s",&pNew->sex);
        getchar();
        if(strcmp(pNew->identity,"学生")==0)
        {
            printf("输入班级：");
            scanf("%s",&pNew->s.classroom);    
        }
        else if(strcmp(pNew->identity,"老诗")==0)
        {
            printf("输入职务:");
            scanf("%s",&pNew->s.duty);
        }
        getchar();

    }
}
free(pNew);
return pHead;

}
//显示信息
void Printf(D pHead)
{
DpTemp=NULL;
int index=1;
pTemp=pHead;
printf("共有信息：%d\n",count);
while(pTemp!=NULL)
{
printf("序号：%d\t",index);
printf("姓名：%s\t",pTemp->name);
printf("性别：%s\t",pTemp->sex);
printf("编号：%d\t",pTemp->num);
printf("身份:%s\t",pTemp->identity);
if(strcmp(pTemp->identity,"学生")==0)
printf("班号:%s\n",pTemp->s.classroom);
else if(strcmp(pTemp->identity,"老诗")==0)
printf("职务:%s\n",pTemp->s.duty);
index++;
pTemp=pTemp->pNext;

}

}
int main()
{
int i;
//定义人数
D arr[100];
D *pHead=NULL;
pHead=arr;
do
{
printf("1.录入,2显示，0退出\n");
printf("输入选择\n");
scanf("%d",&i);
getchar();
//录入
if(i==1)
pHead=Add(pHead);
//显示
else if(i==2)
Printf(pHead);
else
printf("输入错误\n");
}while(i);

}

运行结果及报错内容

我的解答思路和尝试过的方法

刚学习链表编辑，找不出问题的所在了

我想要达到的结果

在显示功能里能完美显示出录入的信息

pHead－>引入信息试试看
pTemp=pHead; 这个删除

修改如下，修改处见注释，共参考:

#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
#include<string.h>
#include<stdlib.h>
int count;
//定义数据包
typedef union type
{
    char duty[20];
    char classroom[20];
}T;
typedef struct Data
{
    char name[20];
    char sex[20];
    char identity[20];
    int num;
    T s;
    // 加入链节点
    struct Data* pNext;
}D;
D *Add(D *pHead) //修改
{
    int i = 0, n = 1;
    D* pNew;
    D* pEnd;
    count = 0;
    //设置起点
    while (1)
    {
        pNew = (D*)malloc(sizeof(D)); //pNew = pEnd = (D*)malloc(sizeof(D));
        pNew->pNext = NULL;  //修改
        printf("输入你要录入的信息\n");
        printf("姓名:");
        scanf("%s", pNew->name); //scanf("%s", &pNew->name);
        getchar();
        printf("性别:");
        scanf("%s", pNew->sex); //scanf("%s", &pNew->sex);
        getchar();
        printf("身份:");
        printf("请输入“学生”或者“老诗”\n");
        scanf("%s", pNew->identity); //scanf("%s", &pNew->identity);
        getchar();
        printf("编号:");
        scanf("%d", &pNew->num);  //scanf("%s", &pNew->sex);
        getchar();
        if (strcmp(pNew->identity, "学生") == 0)
        {
            printf("输入班级：");
            scanf("%s", pNew->s.classroom); //scanf("%s", &pNew->s.classroom);
        }
        else if (strcmp(pNew->identity, "老诗") == 0)
        {
            printf("输入职务:");
            scanf("%s", pNew->s.duty); //scanf("%s", &pNew->s.duty);
        }
        count++;
        if (count == 1)//判断是否为第一次存入
        {
            //首节点与为节点相同
            //pNew->pNext = pHead; 修改
            pHead = pNew;
            pEnd = pNew;
        }
        else
        {
            //已存入资料将指向新录入的节点作为尾节点并指向NULL
            pEnd->pNext = pNew;
            pEnd = pNew;
        }
        printf("非0继续，0.退出\n");
        printf("输入你选的功能\n");
        scanf("%d", &n);
        if (n == 0)
        {
            printf("退出\n");
            break;
        }
            //getchar();
            //pNew = (D*)malloc(sizeof(D));
            //printf("输入你要录入的信息\n");
            //printf("姓名:");
            //scanf("%s", &pNew->name);
            //getchar();
            //printf("性别:");
            //scanf("%s", &pNew->sex);
            //getchar();
            //printf("身份:\n");
            //printf("请输入“学生”或者“老诗”\n");

            //scanf("%s", &pNew->identity);
            //getchar();
            //printf("编号:");
            //scanf("%s", &pNew->sex);
            //getchar();
            //if (strcmp(pNew->identity, "学生") == 0)
            //{
            //    printf("输入班级：");
            //    scanf("%s", &pNew->s.classroom);
            //}
            //else if (strcmp(pNew->identity, "老诗") == 0)
            //{
            //    printf("输入职务:");
            //    scanf("%s", &pNew->s.duty);
            //}
            //getchar();

            //}
    }
    //free(pNew);
    return pHead;
}
//显示信息
void Printf(D* pHead)
{
    D* pTemp = NULL;
    int index = 1;
    pTemp = pHead;
    printf("共有信息：%d\n", count);
    while (pTemp != NULL)
    {
        printf("序号：%d\t", index);
        printf("姓名：%s\t", pTemp->name);
        printf("性别：%s\t", pTemp->sex);
        printf("编号：%d\t", pTemp->num);
        printf("身份:%s\t", pTemp->identity);
        if (strcmp(pTemp->identity, "学生") == 0)
            printf("班号:%s\n", pTemp->s.classroom);
        else if (strcmp(pTemp->identity, "老诗") == 0)
            printf("职务:%s\n", pTemp->s.duty);
        index++;
        pTemp = pTemp->pNext;
    }
}
int main()
{
    int i;
    //定义人数
    //D arr[100]; 这是定义了一个数组
    D* pHead = NULL;
    //pHead = arr; //让指针指向数组 arr？
    do
    {
        printf("1.录入,2显示，0退出\n");
        printf("输入选择\n");
        scanf("%d", &i);
        getchar();
        //录入
        if (i == 1)
            pHead = Add(pHead);
        //显示
        else if (i == 2)
            Printf(pHead);
        else
            printf("输入错误\n");
    } while (i);
}

你可以参考一下这个https://blog.csdn.net/weixin_64811333/article/details/125333242

#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
#include<string.h>
#include<stdlib.h>
int count;
//定义数据包
typedef union type
{
    char duty[20];
    char classroom[20];
}T;
typedef struct Data
{
    char name[20];
    char sex[20];
    char identity[20];
    int num;
    T s;
    // 加入链节点
    struct Data* pNext;
}D;
D *Add(D *pHead) //修改
{
    int i = 0, n = 1;
    D* pNew;
    D* pEnd;
    count = 0;
    //设置起点
    while (1)
    {
        pNew = (D*)malloc(sizeof(D)); //pNew = pEnd = (D*)malloc(sizeof(D));
        pNew->pNext = NULL;  //修改
        printf("输入你要录入的信息\n");
        printf("姓名:");
        scanf("%s", pNew->name); //scanf("%s", &pNew->name);
        getchar();
        printf("性别:");
        scanf("%s", pNew->sex); //scanf("%s", &pNew->sex);
        getchar();
        printf("身份:");
        printf("请输入“学生”或者“老诗”\n");
        scanf("%s", pNew->identity); //scanf("%s", &pNew->identity);
        getchar();
        printf("编号:");
        scanf("%d", &pNew->num);  //scanf("%s", &pNew->sex);
        getchar();
        if (strcmp(pNew->identity, "学生") == 0)
        {
            printf("输入班级：");
            scanf("%s", pNew->s.classroom); //scanf("%s", &pNew->s.classroom);
        }
        else if (strcmp(pNew->identity, "老诗") == 0)
        {
            printf("输入职务:");
            scanf("%s", pNew->s.duty); //scanf("%s", &pNew->s.duty);
        }
        count++;
        if (count == 1)//判断是否为第一次存入
        {
            //首节点与为节点相同
            //pNew->pNext = pHead; 修改
            pHead = pNew;
            pEnd = pNew;
        }
        else
        {
            //已存入资料将指向新录入的节点作为尾节点并指向NULL
            pEnd->pNext = pNew;
            pEnd = pNew;
        }
        printf("非0继续，0.退出\n");
        printf("输入你选的功能\n");
        scanf("%d", &n);
        if (n == 0)
        {
            printf("退出\n");
            break;
        }
            //getchar();
            //pNew = (D*)malloc(sizeof(D));
            //printf("输入你要录入的信息\n");
            //printf("姓名:");
            //scanf("%s", &pNew->name);
            //getchar();
            //printf("性别:");
            //scanf("%s", &pNew->sex);
            //getchar();
            //printf("身份:\n");
            //printf("请输入“学生”或者“老诗”\n");
 
            //scanf("%s", &pNew->identity);
            //getchar();
            //printf("编号:");
            //scanf("%s", &pNew->sex);
            //getchar();
            //if (strcmp(pNew->identity, "学生") == 0)
            //{
            //    printf("输入班级：");
            //    scanf("%s", &pNew->s.classroom);
            //}
            //else if (strcmp(pNew->identity, "老诗") == 0)
            //{
            //    printf("输入职务:");
            //    scanf("%s", &pNew->s.duty);
            //}
            //getchar();
 
            //}
    }
    //free(pNew);
    return pHead;
}
//显示信息
void Printf(D* pHead)
{
    D* pTemp = NULL;
    int index = 1;
    pTemp = pHead;
    printf("共有信息：%d\n", count);
    while (pTemp != NULL)
    {
        printf("序号：%d\t", index);
        printf("姓名：%s\t", pTemp->name);
        printf("性别：%s\t", pTemp->sex);
        printf("编号：%d\t", pTemp->num);
        printf("身份:%s\t", pTemp->identity);
        if (strcmp(pTemp->identity, "学生") == 0)
            printf("班号:%s\n", pTemp->s.classroom);
        else if (strcmp(pTemp->identity, "老诗") == 0)
            printf("职务:%s\n", pTemp->s.duty);
        index++;
        pTemp = pTemp->pNext;
    }
}
int main()
{
    int i;
    //定义人数
    //D arr[100]; 这是定义了一个数组
    D* pHead = NULL;
    //pHead = a
    do
    {
        printf("1.录入,2显示，0退出\n");
        printf("输入选择\n");
        scanf("%d", &i);
        getchar();
        if (i == 1)
            pHead = Add(pHead);
        else if (i == 2)
            Printf(pHead);
        else
            printf("输入错误\n");
    } while (i);
}