用指向基类对象的指针输出数据

最新推荐文章于 2021-01-02 15:13:14 发布

原创最新推荐文章于 2021-01-02 15:13:14 发布 · 470 阅读

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本文通过一个C++程序示例介绍了类的继承和多态的概念。示例中定义了基类Student和派生类Graduate，并演示了如何在派生类中调用基类的构造函数及成员变量的初始化过程。此外，还展示了如何通过基类指针操作派生类对象并调用其成员函数。

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/*#include <iostream>
#include <string>
using namespace std;
class A
{
public:
    A()
    {
        cout<<"基类的构造函数constructing A "<<endl;
    }
    ~A()
    {
         cout<<"基类的析构函数destructing A "<<endl;
    }
};
class B:public A
{
public:
    B()
    {
        cout<<"派生类A的构造函数constructing A "<<endl;
    }
    ~B()
    {
        cout<<"派生类A的析构函数destructing A "<<endl;
    }
};
class C:public B
{
public:
    C()
    {
        cout<<"派生类A的构造函数constructing C "<<endl;
    }
    ~C()
    {
        cout<<"派生类A的析构函数destructing C "<<endl;
    }
};
int main()
{
    C c1;
    return 0;
}*/
#include <iostream>
using namespace std;
class Student
{
public:
    Student(int ,string,float);
    void display();
private:
    int num;
    string name;
    float score;
};

Student::Student(int n,string nam,float s)
{
    num=n;
    name=nam;
    score=s;
}
void Student::display()
{
    cout<<endl<<"num:"<<num<<endl;
    cout<<"name:"<<name<<endl;
    cout<<"score:"<<score<<endl;
}

class Graduate:public Student
{
public:
    Graduate(int ,string ,float, float);
    void display();
private:
    float pay;
};
Graduate::Graduate(int n,string nam,float s,float p):Student(n,nam,s),pay(p)
{

}
void Graduate::display()
{
    Student::display();
    cout<<"pay="<<pay<<endl;
}
int main()
{
    Student stud1(1001,"Li",87.5);
    Graduate grad1(2001,"Wang",98.5,563.5);
    Student *pt=&stud1;
    pt->display();
    pt=&grad1;
    pt->display();
    return 0;
}