C++作业6.12

最新推荐文章于 2024-06-13 20:54:11 发布

原创最新推荐文章于 2024-06-13 20:54:11 发布 · 718 阅读

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本文通过 C++ 代码示例介绍了如何使用基类指针调用派生类的方法来实现多态。具体实现了矩形和等腰三角形的面积计算，并展示了多态在 C++ 中的应用。

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<img src="https://img-blog.youkuaiyun.com/20150516184124244?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvU2FrdXJhcmFpbjc3/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center" alt="" />#include<iostream>
using namespace std;


class area_cl{
public:
	area_cl(double r, double s)
	{
		height = r; width = s;
	}
	virtual void area() = 0;
		
protected:
	double height,width;


};
class rectangle:public area_cl{
public:
	rectangle(double r, double s): area_cl(r,s)
	{};
	void area()
	{
		cout << "矩形的高是: " << height << "宽是: " << width;
		cout << "面积是: " << height*width << endl;
	}
};
class isosceles:public area_cl{
public:
	isosceles(double r, double s): area_cl(r,s)
	{};
	void area()
	{
		cout << "三角形的高是: " << height << "宽是: " << width;
		cout << "面积是: " << height*width << endl;
	}
};
int main()
{	
	area_cl *p;
	rectangle t(10.0, 5.0);
	isosceles s(4.0, 6.0);
	p = &t;
	p->area();
	p = &s;
	p->area();
	return 0;


}

<img src="https://img-blog.youkuaiyun.com/20150516184124244?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvU2FrdXJhcmFpbjc3/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center" alt="" />