我初学数据结构，在做一个大作业，是关于交通咨询的，这是一小部分。在主函数中的输入有问题，运行会自动停止，求指教。
#include <stdio.h>
#include <windows.h>
#include <string.h>
#include <stdlib.h>

typedef struct
{
    char flightnum;
    char flightbegin;
    char flightend;
    double time;
    double fee;
}flight;
typedef struct
{
    char trainnum;
    char trainbegin;
    char trainend;
    double time;
    double fee;
}train;
typedef struct {
    char begin;
    char end;
    flight finformation;
    train tinformation;
    double distance;
    int flag;
}information;
typedef struct node
{
    information trip;
    struct node *next;
}node,*LNode;
void case1();
int main()
{
    int i;
    printf("\n\n\n\n");
    printf("                     **********************************************\n");
    printf("                     *                                            *\n");
    printf("                     *            全国交通咨询模拟                *\n");
    printf("                     *                                            *\n");
    printf("                     **********************************************\n");
    printf("按任意键继续\n");
    getchar();
    system("cls");
    printf("\n\n\n\n");
    printf("                                      选择要实现的功能\n");
    printf("                     *********************************************\n");
    printf("                     **                1.管理员操作             **\n");
    printf("                     **                2.用户咨询               **\n");
    printf("                     **                3.退出系统               **\n");
    printf("                     *********************************************\n");
    printf("                     *选择功能?\n*");
    scanf("%d",&i);
    system("cls");
    if(i==1)
        case1();
}
void case1()
{
    LNode head,p1;
    head=(LNode)malloc(sizeof(node));p1=head;
    int i;char c;
    printf("\n\n\n\n");
    printf("                                    选择编辑方式\n");
    printf("                     *********************************************\n");
    printf("                     **                1.键盘                   **\n");
    printf("                     **                2.文件                   **\n");
    printf("                     *********************************************\n");
    printf("                     *选择功能?\n*");
    scanf("%d",&i);
    if(i==1)
    {
        //将信息读入链表中（起点，终点，来往的飞机（航班号，起飞时间，降落时间，飞行时间，费用），来往的火车（列车号，出发时间，到站时间，行驶时间，费用），城市距离）
        while(1)
        {
            p1=(LNode)malloc(sizeof(node));
            p1=p1->next;
            scanf("%s",&p1->trip.begin);scanf("\n");scanf("%s",&p1->trip.end);
            scanf("%s",&p1->trip.finformation.flightnum);
            scanf("%s",&p1->trip.finformation.flightbegin);
            scanf("%s",&p1->trip.finformation.flightend);
            scanf("%lf %lf",&p1->trip.finformation.time,&p1->trip.finformation.fee);
            scanf("%s",&p1->trip.tinformation.trainnum);
            scanf("%s",&p1->trip.tinformation.trainbegin);
            scanf("%s",&p1->trip.tinformation.trainend);
            scanf("%lf %lf",&p1->trip.tinformation.time,&p1->trip.tinformation.fee);
            scanf("%lf",&p1->trip.distance);
               }
    }
}

p1=p1->next;
 
指向的地址有问题