C++程序问题

答案:2 悬赏:20

解决时间 2021-03-24 06:21

提问者网友：白柏唇蜜
2021-03-23 14:44

将Shape基类定义为抽象类，其成员函数GetArea()为虚函数，由Shape类派生出Circle类（圆）和Rectangle类（矩形），并由Rectangle类派生出Square类（正方形），它们都利用GetArea()函数计算图形面积。根据下列调用语句，分别写出各个类的定义，并且成功地调试运行程序
下面是已经给出的主函数：
Shape *s[5];
s[0]=new Circle(2);
s[1]=new Circle(3);
s[2]=new Rectangle(3, 4);
s[3]=new Rectangle(4, 5);
s[4]=new Square(5);
for(int i=0; i<5; i++) cout<GetArea()<整个程序怎么写啊

最佳答案

二级知识专家网友：气场征服一切
2021-03-23 15:12

#include
using namespace std;
class Shape
{
public:
//Shape();
virtual double GetArea()=0;
//virtual ~Shape();
};

class Circle: public Shape
{

private: double _r;
public:Circle(double a)
{
_r=a;
}

virtual double GetArea()
{
return 3.14*_r*_r;
}
// virtual ~Circle();
};

class Rectangle:public Shape
{

private: double _width;
double _height;
public:Rectangle(double width,double height)
{
_width=width;
_height=height;
}
Rectangle()
{
_width=0;
_height=0;
}

virtual double GetArea()
{
return _width*_height;
}
// virtual ~Rectangle();
};

class Square: public Rectangle
{

private: double _width;

public:Square(double width)
{
_width=width;

}

virtual double GetArea()
{
return _width*_width;
}
// virtual ~Square();
};

void main()
{
Shape *s[5];

s[0]=new Circle(2);
s[1]=new Circle(3);
s[2]=new Rectangle(3, 4);
s[3]=new Rectangle(4, 5);
s[4]=new Square(5);
for(int i=0; i<5; i++) cout<GetArea()< }

全部回答

1楼网友：浪女动了心
2021-03-23 16:30

#include #define PI 3.14 using namespace std; class Shape { public: virtual double GetArea() { return 0.0; } }; class Circle:public Shape { protected: double r; public: Circle(double r) { this->r=r; } virtual double GetArea() { return PI*r*r; } }; class Rectangle:public Shape { protected: double x,y; public: Rectangle(double x,double y) { this->x=x; this->y=y; } virtual double GetArea() { return x*y; } }; class Square:public Rectangle { public: Square(double x):Rectangle(x,x) { } virtual double GetArea() { return x*y; } }; int main() { Shape *s[5]; s[0]=new Circle(2); s[1]=new Circle(3); s[2]=new Rectangle(3, 4); s[3]=new Rectangle(4, 5); s[4]=new Square(5); for(int i=0; i<5; i++) cout<GetArea()<

我要举报

如以上问答内容为低俗、色情、不良、暴力、侵权、涉及违法等信息，可以点下面链接进行举报！