关于动态内存的问题，请进来看下！

qw30716

#include<iostream>
class Person
{
public:
  virtual void input()
  {}
protected:
int number;
char* name;
};
class Student:public Person
{
public:

Student(int number,char *name,char* classes,int score)
{
  
  this->number=number;
  this->name=name;
  this->classes=classes;
  this->score=score;
}
virtual void input()
{
  std::cout<<"请输入学生信息："<<std::endl;
  std::cout<<"学生编号："<<number<<"\n";
  std::cout<<"学生姓名："<<name<<"\n";
  std::cout<<"学生班级："<<classes<<"\n";
  std::cout<<"学生成绩："<<score<<"\n";
}
~Student()
{
  std::cout<<"学生信息输入结束！"<<std::endl;
}
private:
char *classes;
int score;

};
class Teather:public Person
{
public:

Teather(int number,char *name,char *titel,int department)
{
  this->name=name;
  this->number=number;
  this->titel=titel;
  this->department=department;
}
virtual void input()
{
  std::cout<<"请输入教师信息："<<std::endl;
  std::cout<<"教师编号："<<number<<"\n";
  std::cout<<"教师姓名："<<name<<"\n";
  std::cout<<"教师职称："<<titel<<"\n";
  std::cout<<"教师部门："<<department<<"\n";
}
~Teather()
{
  std::cout<<"教师信息输入结束！"<<std::endl;
}
private:
char* titel;
int department;

};
int main()
{
Person *pi=new Person;
Student s(1200380214,"lan","三院八专业(2)班",90);

pi=&s;
pi->input();
std::cout<<std::endl;
delete pi;
pi=NULL;
pi=new Teather(407,"laoshi","计算机实验老师",3);
pi->input();
delete pi;
pi=NULL;


return 0;
}
哪里有问题