程序代码：

#include "stdafx.h"
#include <iostream>
using namespace std;
class CStudent
{
private:
    char *p_name;
    int age;
public:
    CStudent(char *,int);
    ~CStudent() {
        if(p_name!=NULL)
            delete p_name;
        cout<<"destructor of class"<<endl;
    }
    void show(void);
};
CStudent::CStudent(char *source,int a)
{
    p_name=new(char[strlen(source)+1]);
    strcpy(p_name,source);
    age=a;
}
void CStudent::show()
{
    cout<<p_name<<" "<<age<<endl;
}
void main()
{
    CStudent *p_student=new CStudent("张三",20);
    CStudent stud1("李四",50);
    CStudent stud3(stud1);

    p_student->show();
    stud1.show();
    stud3.show();
    delete p_student;
}