为什么输入1弹不出“用户指令--->>新建联系人:“，求各位大神解答，谢谢啦

#include<stdlib.h>

#include"List.h"

#include<iostream>

using namespace std;

void createPerson(List *pList)

{

Node node;

Person person;

cout<<"请输入姓名：";

cin>>person.name;

cout<<"请输入电话：";

cin>>person.phone;

node.data=person;

pList->ListInsertTail(&node);

}

int menu()

{

//显示通讯录功能菜单

cout<<"功能菜单"<<endl;

cout<<"1.新建联系人"<<endl;

cout<<"2.删除联系人"<<endl;

cout<<"3.浏览通讯录"<<endl;

cout<<"4.退出通讯录"<<endl;

cout<<"请输入:";

int order=0;

cin>>order;

return order;

}

int main(void){

int userOrder=0;

List *pList=new List();

while(userOrder!=4)

{

userOrder=menu();

switch(userOrder)

{

case1:

cout<<"用户指令--->>新建联系人:"<<endl;

createPerson(pList);

break;

case2:

cout<<"用户指令--->>删除联系人:"<<endl;

    break;

case3:

cout<<"用户指令--->>浏览通讯录:"<<endl;

pList->ListTraverse();

break;

case4:

cout<<"用户指令--->>退出通讯录:"<<endl;

break;

default:

break;

}

}

delete pList;

pList=NULL;

}