请哪位帮我看看我的问题

Question

#include<stdio.h>
#include<stdlib.h>
//创建结构体 
struct school 
{
    char name[20];
    int age;
    char gender;
    int number;
    struct school *next;
 };
int  count ;
//创建链表 
 struct school *creat()
 {
    count=1;
    struct school *head=NULL;
    struct school *end,*news;
    end=news=(struct school*)malloc(sizeof(struct school));
    printf("现在请输入第%d位学生的资料\n",count); 
    printf("请输入学生的学号，没有学生后按0即可：");
    scanf("%d",&news->number);
    if(news->number==0)
    {
    goto s;    
    }
    printf("请输入学生的姓名：");
    scanf("%s",&news->name);
    printf("请输入学生的年龄:");
    scanf("%d",&news->age);
    printf("请输入学生的性别(M或W):");
    scanf("%s",&news->gender);
    printf("\n \n");
s:    while(news->number!=0)
    {
        count++;
        if(count==1)
        {
            news->next=head;
            head=news;
            end=news;
        }
        else
        {
            news->next=NULL;  
            end->next=news;
            end=news;
        }
        news=(struct school*)malloc(sizeof(struct school));
        printf("现在请输入第%d位学生的资料\n",count); 
        printf("请输入学生的学号：");
        scanf("%d",&news->number);
        if(news->number==0)
        {
        goto s;    
        }
        printf("请输入学生的姓名：");
        scanf("%s",&news->name);
        printf("请输入学生的年龄:");
        scanf("%d",&news->age);
        printf("请输入学生的性别:");
        scanf("%s",&news->gender);
        printf("\n \n");
        
    }
    free(news);
    return head;
    
  } 
void print(struct school *head)
  {
  count=1;
      struct school *itemp;
      itemp=head;
      while(itemp==NULL)
      {
        printf("这是第%d位同学的资料\n",count);
        printf("姓名：%s\n",itemp->name);
        printf("姓别：%c\n",itemp->gender);
        printf("年龄：%d\n",itemp->age);
        printf("学号：%d\n",itemp->number);
        printf("\n \n \n");
        itemp=itemp->next;
       }
  } 
//主函数 
int main()
{
    printf("-------XX学院学生录入系统-------\n");
    printf("请按照要求填写学生姓名，性别，年龄以及学号，\n若输入完成后学号填零即可！\n");
    printf("\n \n");
    struct school *head; 
    head=creat();
    print(head);
    return 0;
}

为什么我的输出是NULL？

Answer 1

修改如下，供参考：

#include <stdio.h>
#include <stdlib.h>
//创建结构体 
struct school{
    char name[20];
    int age;
    char gender;
    int number;
    struct school* next;
};
int  count;
//创建链表 
struct school* creat()
{
    count = 0;  //修改
    struct school* head = NULL;
    struct school* end, * news;
//    end = news = (struct school*)malloc(sizeof(struct school));
//    printf("现在请输入第%d位学生的资料\n", count);
//    printf("请输入学生的学号，没有学生后按0即可：");
//    scanf("%d", &news->number);
//    if (news->number == 0)
//    {
//        goto s;
//    }
//    printf("请输入学生的姓名：");
//    scanf("%s", &news->name);
//    printf("请输入学生的年龄:");
//    scanf("%d", &news->age);
//    printf("请输入学生的性别(M或W):");
//    scanf("%s", &news->gender);
//    printf("\n \n");
    while (1) //s:    while (news->number != 0) 修改
    {
        news = (struct school*)malloc(sizeof(struct school));
        printf("现在请输入第%d位学生的资料\n", count+1); //修改
        printf("请输入学生的学号：");
        scanf("%d", &news->number);
        if (news->number == 0){
            free(news);
            break;
        }
        printf("请输入学生的姓名：");
        scanf("%s", news->name);  //scanf("%s", &news->name);
        printf("请输入学生的年龄:");
        scanf("%d", &news->age);
        printf("请输入学生的性别(男:M 女:F):");
        scanf(" %c", &news->gender); //scanf("%s", &news->gender);
        printf("\n \n");
        count++;
        if (count == 1)
        {
            news->next = head;
            head = news;
            end = news;
        }
        else
        {
            news->next = NULL;
            end->next = news;
            end = news;
        }
    }
    //free(news);
    return head;
}
void print(struct school* head)
{
    int cnt = 0;
    struct school* itemp;
    itemp = head;
    while (itemp != NULL) //(itemp == NULL)
    {
        cnt++;
        printf("这是第%d位同学的资料\n", cnt);
        printf("姓名：%s\n", itemp->name);
        printf("姓别：%c\n", itemp->gender);
        printf("年龄：%d\n", itemp->age);
        printf("学号：%d\n", itemp->number);
        printf("\n");
        itemp = itemp->next;
    }
}
//主函数 
int main()
{
    printf("-------XX学院学生录入系统-------\n");
    printf("请按照要求填写学生姓名，性别，年龄以及学号，\n若输入完成后学号填零即可！\n");
    printf("\n \n");
    struct school* head;
    head = creat();
    print(head);
    return 0;
}