第十三周实验报告 任务四

源程序：

#include<iostream>
#include<Cmath>
using namespace std;
const double P = 3.14;

class CSolid//定义虚基类
{
public:
	virtual double area() const = 0;//定义纯虚函数
	virtual double volume() const = 0;//定义虚函数
};
class CCube:public CSolid
{
public:
	CCube(double l);
	
	~CCube();
	
	double area() const;
	
	double volume() const;
	
	double getl();
	
private:
	
	double len;
};

class CBall:public CSolid
{
public:
	CBall(double r);
	
	~CBall();
	
	double area() const;
	
	double volume() const;
	
	double getr1();
	
private:
	
	double rang;
};

class CCylinder:public CSolid
{
public:
	CCylinder(double r, double h);
	
	~CCylinder();
	
	double area() const;
	
	double volume() const;
	
	double getr2();
	
	double geth();
	
private:
	
	double rang;
	double high;
};

CCube::CCube(double l):len(l){}

CCube::~CCube(){}

double CCube::area() const
{
	return 6 * len * len;
}

double CCube::volume() const
{
	return len * len * len;
}

double CCube::getl()
{
	return len;
}

CBall::CBall(double r):rang(r){}

CBall::~CBall(){}

double CBall::area() const
{
	return 4 * P * rang * rang;
}

double CBall::volume() const 
{
	return ( 4 * P * rang * rang * rang) / 3;
}

double CBall::getr1()
{
	return rang;
}

CCylinder::CCylinder(double r, double h):rang(r), high(h){}

CCylinder::~CCylinder(){}

double CCylinder::area() const
{
	return ((2 * P * rang * rang) + (2 * P * rang) * high );
}

double CCylinder::volume() const
{
	return P * rang * rang * high;
}

double CCylinder::getr2(){return rang;}

double CCylinder::geth(){return high;}


int main()
{
	CCube c1(1);
	CBall c2(2);
	CCylinder c3(3, 4);
	CSolid *p;
	
	p =  &c1;
	cout << "边长为 " <<c1.getl() << " 的长方体的面积为: ";
	cout << p -> area() << endl;
	cout << "边长为 " << c1.getl() << " 的长方体的体积为: ";
	cout << p -> volume() << endl << endl;
	
	p = &c2;
	cout << "半径为 " << c2.getr1() << " 的球体的面积为: ";
	cout << p -> area() << endl;
	cout << "半径为 " <<c2.getr1() << " 的球体的体积为: ";
	cout << p -> volume() << endl << endl;
	
	p = &c3;
	cout << "半径为 " << c3.getr2() <<", 高为 " << c3.geth() << " 的圆柱体的面积为: ";
	cout << p -> area() << endl;
	cout << "半径为 " << c3.getr2() <<", 高为 " << c3.geth() << " 的圆柱体的体积为: ";
	cout << p -> volume() << endl;
	
	system("pause");
	
	return 0;
}

 

截图：

 

最近做任务老是先把函数在类里面定义好···等完成程序运行无错后在将函数转到类外定义···貌似之前有的程序未在类外定义啊···

失误···嘿嘿···

有了之前那几个任务做铺垫~最后这个也没有什么障碍~完成的挺顺利~