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  • C++基类的继承和多态

    C++基类的继承和多态

    虚函数:

    子类的虚函数会覆盖基类同名的函数。

    非虚函数:

    指针声明是什么类型,就只能访问该类所拥有的函数。。

    要特别注意指针声明成什么类型。。。。和它 new 的类型无关。。。无关。。

    class Base
    {
    public:
        Base(){};
        ~Base(){};
    public:
        virtual void printHello()
        {
            cout << "Base: Base say hello"<<endl;
        }
    
        void printName()
        {
            cout << "Base: I am Base" << endl;
        }
    
        void printDate()
        {
            cout << "Base: Base 6666" << endl;
        }
    };
    
    class Drive : public Base
    {
    public:
        Drive(){};
        ~Drive(){};
    public:
        virtual void printHello()
        {
            cout << "Drive: Drive say hello" << endl;
        }
    
        void printName()
        {
            cout << "Drive: I am Drive" << endl;
        }
    
        void printAge()
        {
            cout << "Drive: Age 29" << endl;
        }
    
    };
    
    
    
    int main(int argc, char* argv[])
    {
        //Test1();
        //Test2();
        //Test3();
        //Test4();
        //Test5();
        //Test6();
        //Test7();
    
        Base* objB1 = new Drive();
        objB1->printHello();
        objB1->printName();
        objB1->printDate();
    //    objB1->printAge();  //编译器会报错 
    
    ///输出结果如下:
    //  Drive: Drive say hello
    //  Base : I am Base
    //   Base : Base 6666
    
    
        cout << endl;
        system("pause");
        return 0;
    }
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  • 原文地址:https://www.cnblogs.com/music-liang/p/12726786.html
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