Question

C++编程题，求高手指点，感激不尽！！！

定义Point作为基类，在此基础上派生出圆Circle类，该类含有计算面积的成员函数，并由Circle类派生出圆柱Cylinder类，该类含有计算柱体的表面积和体积的成员函数。
要用C++编程，并且希望能够把全过程给写出来哈~~

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Answer 1

#include <iostream>
#include <cmath>
using namespace std;

class Point
{
int x;
int y;

public:
Point(){}
Point(int xx,int yy){x = xx;y = yy;}
~Point(){}
int X(){return x;}
int Y(){return y;}

};

class Circle : public Point
{
float Radius;
public:
Circle(){}
Circle(float Rr){Radius = Rr;}
~Circle(){}
float GetCircleS(){return (float)3.14*Radius;}
float GetRadius(){return (float)Radius;}
};

class Cylinder :public Circle
{
float High;
Circle Cir;
public:
Cylinder(){}
Cylinder(Circle& cir,float high){Cir = cir;High = high;}
~Cylinder(){}
float GetCylinderS(){return (float)2*3.14*Cir.GetRadius()*High+2*3.14*Cir.GetRadius();}
float GetCylinderV(){return (float)3.14*Cir.GetRadius()*Cir.GetRadius()*High;}
};

int main()
{
Circle cir(2);
cout<<"圆半径为"<<cir.GetRadius()<<"\t圆面积为："<<cir.GetCircleS()<<endl;
Cylinder cyl(cir,6);
cout<<"圆柱的表面积为："<<cyl.GetCylinderS()<<"\t圆柱的体积为: "<<cyl.GetCylinderV()<<endl;

system("pause");
return 0;
}