C语言调试结束后会提示需要关闭

在p1=( struct user *)malloc(LEN);
之后别忘了加
p1->next=NULL;
改完的：

#include "stdio.h"
#include "malloc.h"
#include "conio.h"
#define LEN sizeof(struct user)
struct user *head;

void print(struct user *head);

struct user
{
int num;
int shouzhi;

char menlei[10];

char shijian[15];
struct user *next;

};
struct user *creat(void);

void main()
{
head=creat();
print(head);

}
struct user *creat(void)
{
int n,c;
int m;
struct user *p1,*p2;
p1=p2=( struct user *)malloc(LEN);
p1->next=NULL;
printf("请输入序号(1,2.......)\n");
scanf("%d",&p1->num);
printf("\n");
printf("请输入收支(收入正号，支出负号)\n");
scanf("%d",&p1->shouzhi);
printf("\n");