怎样在switch语句后创建类对象？？求解

#include <iostream>
#include <string>
using namespace std;
class record
{
public:
    record(string nam,string sex,int ca,int bir,string add,int a):name(nam),sex(sex),card(ca),birth(bir),address(add),age(a){}
    void input()
    {
        cout<<"请输入姓名："<<endl; cin>>name;
        cout<<"请输入性别："<<endl; cin>>sex;
        cout<<"请输入身份证号："<<endl; cin>>card;
        cout<<"请输入生日："<<endl; cin>>birth;
        cout<<"请输入地址："<<endl; cin>>address;
        cout<<" 请输入年龄："<<endl; cin>>age;
    }

    void display()
    {
        cout<<"姓名："<<name<<" "<<"性别："<<sex<<" "<<"身份证号："<<card<<endl;
        cout<<"生日："<<birth<<" "<<"地址："<<address<<" "<<"年龄："<<endl;
    }
private:
    string name;
    string sex;
    int card;
    int birth;
    string address;
    int age;
};
class student:public record
{
public:
    student(string nam,string sex,int ca,int bir,string add,int a,int num,int ro,string sub,int gr):record( nam, sex, ca, bir, add, a)
    {number=num;
    room=ro;
    subject=sub;
    grade=gr;
    }
    student(){};                   //定义无参的构造函数
    void inputstu()
    {
        input();
        cout<<"请输入学号："<<endl; cin>>number;
        cout<<"请输入宿舍号："<<endl; cin>>room;
        cout<<"请输入专业："<<endl; cin>>subject;
        cout<<"请输入年级："<<endl; cin>>grade;
    }
    void showstu()
    {
        display();
        cout<<"学号："<<number<<" "<<"宿舍号："<<room<<" "<<"专业："<<subject<<" "<<"年级："<<grade<<endl;
    }
   
private:
    int number;
    int room;
    string subject;
    int grade;
};
class teacher:public record
{
public:
    teacher(string nam,string sex,int ca,int bir,string add,int a,int ap,int wo,int ea,string th,string re,int yanum):
      record(nam,sex,ca,bir,add,a)
      {apartment=ap;
      work=wo;
      earn=ea;
      teach=th;
      research=re;
      yanumber=yanum;
      }
      teacher(){};                  //定义无参的构造函数
      void inputtea()
      {
          input();
          cout<<"请输入公寓："<<endl; cin>>apartment;
          cout<<"请输入工作时间："<<endl; cin>>work;
          cout<<"请输入所教专业："<<endl; cin>>teach;
          cout<<"请输入科研单位："<<endl; cin>>research;
          cout<<"请输入所带研究生数目："<<endl; cin>>yanumber;
      }
      void showtea()
      {
          display();
          cout<<"公寓："<<apartment<<" "<<"工作时间："<<work<<" "<<"收入："<<earn<<" "<<"所教科目："<<teach<<" "<<"科研名称："
              <<research<<" "<<"所带研究生数目："<<yanumber<<endl;
      }
private:
    int apartment;
    int work;
    int earn;
    string teach;
    string research;
    int yanumber;
};
int main()
{   int flag=1;
    student *stu=0;teacher *tea=0;
    while(flag)
    {
        cout<<"================================================="<<endl;
        cout<<"      1 学生通道       2 教师通道                "<<endl;
        cout<<"      3 退出                                     "<<endl;
        cout<<"================================================="<<endl;
        cout<<"请输入您的选择："<<endl;
        int choice;
        cin>>choice;
        switch(choice)
        {
    case 1: stu=new student();if(stu) stu->inputstu();cout<<"现在核查一遍信息："<<endl;stu->showstu();break;
    case 2: tea=new teacher();if(tea) tea->inputtea();cout<<"现在核查一遍信息："<<endl;tea->showtea();break;
    case 3: break;
        }
    }
    return 0;
}