第十三周实验报告四

<span style="font-size:16px;">#include<iostream>
using namespace std;

const double PI = 3.14159;

class CSolid
{
public:
virtual double area() const =0;
virtual double volume() const =0;
};

class CCube: public CSolid
{
public:
CCube(double length);
virtual double area() const;
virtual double volume() const;
void show_area();
void show_volume();
protected:
double length;
};

class CBall: public CSolid
{
public:
CBall(double radius);
virtual double area() const;
virtual double volume() const;
protected:
double radius;
};

class CCylinder: public CSolid
{
public:
CCylinder(double height, double radius);
virtual double area() const;
virtual double volume() const;
void show_area();
void show_volume();
protected:
double height;
double radius;
};

CCube::CCube(double length)
{
this->length = length;
}

double CCube::area() const
{
return (this->length * this->length * 6);
}

double CCube::volume() const
{
return (this->length * this->length * this->length);
}

CBall::CBall(double radius)
{
this->radius = radius;
}

double CBall::area() const
{
return (4 * PI * this->radius * this->radius);
}

double CBall::volume() const
{
return (PI * this->radius * this->radius * this->radius * 3 / 4);
}

CCylinder::CCylinder(double height, double radius)
{
this->height = height;
this->radius = radius;
}

double CCylinder::area() const
{
return (2 * (PI * this->radius * this->radius) + this->height * (2 * PI * this->radius));
}

double CCylinder::volume() const
{
return (PI * this->radius * this->radius * this->height);
}

int main()
{
CSolid *p;

CCube ccube(5);
CBall cball(4);
CCylinder ccylinder(10, 2);

p = &ccube;

cout << "正方体的表面积是:" << p->area() << endl;
cout << "正方体的体积是:" << p->volume() << endl;

p = &cball;

cout << "球体的表面积是:" << p->area() << endl;
cout << "球体的体积是:" << p->volume() << endl;

p = &ccylinder;

cout << "圆柱体的表面积是:" << p->area() << endl;
cout << "圆柱体的体积是:" << p->volume() << endl;

system("pause");
return 0;
}
</span>