技術標籤：南郵實驗c++

#include<iostream>
using namespace std;
const double PI = 3.14156;
class Container
{
protected:
	double radius;
public:
	Container(double r)
	{
		radius = r;
	}
	virtual double area() = 0;
	virtual double volume() = 0;
	virtual void print() = 0;
};
class Cube :public Container
{
public
 
:
	Cube(double r) :Container(r)
	{}
	double area()
	{
		return 6 * radius * radius;
	}
	double volume()
	{
		return radius * radius * radius;
	}
	void print()
	{
		double s, v;
		s = 6 * radius * radius;
		v = radius * radius * radius;
		cout << "正方體表面積是: " << s << endl;
		cout <<
 
 "正方體體積是: " << v << endl;
	}
};
class Sphere :public Container
{
public:
	Sphere(double r) :Container(r) {}
	double area()
	{
		return 4 * PI * radius * radius;
	}
	double volume()
	{
		return (radius * radius * radius * PI * 4) / 3;
	}
	void print()
	{
		double s, v;
		s = 4 * PI *
 
 radius * radius;
		v = (radius * radius * radius * PI * 4) / 3;
		cout << "球體表面積是: " << s << endl;
		cout << "球體體積是: " << v << endl;
	}
};
class Cylinder :public Container
{
protected:
	double height;
public:
	Cylinder(double r, double h) :Container(r), height(h) {}
	double area()
	{
		return PI * radius * radius * 2 + 2 * PI * radius * height;
	}
	double volume()
	{
		return PI * radius * radius * height;
	}
	void print()
	{
		double s, v;
		s = PI * radius * radius * 2 + 2 * PI * radius * height;
		v = PI * radius * radius * height;
		cout << "圓柱體表面積是: " << s << endl;
		cout << "圓柱體體積是: " << v << endl;
	}
};
int main()
{
	Container* p;
	Cube a(4);
	Sphere b(4);
	Cylinder c(4, 4);
	p = &a;
	cout << p->area() << endl;
	cout << p->volume() << endl;
	p->print();
	p = &b;
	cout << p->area() << endl;
	cout << p->volume() << endl;
	p->print();
	p = &c;
	cout << p->area() << endl;
	cout << p->volume() << endl;
	p->print();
	return 0;
}