7.28基类对象的指针指向公用派生类对象的应用。

最新推荐文章于 2023-12-11 10:15:54 发布

张睿core

最新推荐文章于 2023-12-11 10:15:54 发布

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本文链接：https://blog.youkuaiyun.com/u013487880/article/details/38929187

本文展示了基类对象指针如何指向公用派生类对象，并通过成员函数展示对象属性，涉及C++面向对象编程知识。

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基类对象的指针指向公用派生类对象的应用。
#include <iostream>
using namespace std;
class Point
{public:
Point(double a = 0, double b = 0) { x = a; y = b; }
void Show( )
{ cout << "The coordinates of the point: (" << x <<", "<< y << ")" << endl; }
protected:
double x, y;
};
class Circle: public Point
{public:
Circle(double a = 0, double b = 0, double c = 1): Point(a, b){ r = c; }
void Show( )
{ cout << " The center coordinates of the Circle: ";
cout << "(" << x << ", " << y << ")" << endl;
cout << "radius: " << r << endl;
}
private:
double r;
};
int main( )
{ Point point(0, 0);
Circle circle(1, 1, 2);
Point *p = &point;
p -> Show( );
p = &circle;
p -> Show( );
return 0;
}