proj11_06.cpp

来自「C++程序设计教程的全部源代码 包含与教程同步的PPT 方便学习」· C++ 代码 · 共 39 行

#include <iostream.h>
class Shapes
{
public:
	// void draw()
    virtual void draw()		//基类中的函数
    {
		cout << "Draw Base\n";
	}
};
class circle: public Shapes
{
private:    int radius;
public:
    void draw()		//在派生类中重定义
    {
		cout << "Draw circle" << endl;
	}
};
class square : public Shapes
{
private:    int length;
public:
    void draw()		//在派生类中重定义
    {
		cout << "Draw square" << endl;
	}
};
void main()
{
	Shapes* ptr;
	circle c;
	square s;
	ptr = &c;
	ptr->draw();
	ptr = &s;
	ptr->draw();
}