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C++继承

Circular圆形类

/*圆形类*/
class Circular
{
private:const static double PI;double R = 0;
public:Circular() = default;Circular(double r);double GetArea();    /*圆面积*/double GetGirth();   /*圆周长*/
};
const double Circular::PI = 3.14;Circular::Circular(double r): R {r} {}
/*圆面积*/
double Circular::GetArea()
{double S = PI * R * R;return S;
}
/*圆周长*/
double Circular::GetGirth()
{double L = 2 * PI * R;return L;
}

Cylinder圆柱体类

/*圆柱体类*/
class Cylinder: public Circular
{
private: double H = 0;
public:Cylinder() = default;Cylinder(double r,double h);double GetVolume();        /*圆柱体体积*/double GetSurfaceArea();   /*圆柱体表面积*/};Cylinder::Cylinder(double r, double h) : Circular{ r }, H{ h } {}
/*圆柱体体积*/
double Cylinder::GetVolume()
{double V = H * GetArea();return V;
}
/*圆柱体表面积*/
double Cylinder::GetSurfaceArea()
{double S = 2 * GetArea() + H * GetGirth();return S;
}

测试：

#include "Circular.h"#include <iostream>
using namespace std;int main(void)
{Circular Cir{ 10 };cout << "圆面积：" << Cir.GetArea() << endl;cout << "圆周长：" << Cir.GetGirth() << endl;Cylinder Cy{ 5,10 };cout << "底面积：" << Cy.GetArea() << endl;cout << "体积：" << Cy.GetVolume() << endl;cout << "底周长：" << Cy.GetGirth() << endl;cout << "表面积：" << Cy.GetSurfaceArea() << endl;return 0;
}

测试结果：