13周任务4-优快云博客

本文通过抽象基类Solid定义了几何体的通用接口，并实现了立方体(Cube)、球体(Ball)和圆柱体(Cylinder)的具体计算方法。使用多态特性，通过指向基类的指针调用不同派生类的成员函数，展示了如何统一处理不同类型的几何体。

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#include<iostream>
using namespace std;
class Solid
{
public:
 virtual float area() const=0;
 virtual float volume() const=0;
};
class Cube:public Solid
{
public:
 virtual float area() const
 {
  return 6*lon*lon;
 }

 virtual float volume() const
 {
  return lon*lon*lon;
 }
 Cube(double l):lon(l){}
protected:
 double lon;
};
class Ball:public Solid
{
public:
    virtual float area() const
 {
  return 4*3.14*r*r;
  
 }
 virtual float volume() const
 {
  return (4/3)*3.14*r*r*r;
 }
 Ball(double r1):r(r1){}
protected:
 double r;
};
class Cylinder:public Solid
{
public:
 virtual float area() const
 {
  return 2*3.14*R*R+2*3.14*R*H;
 }

 virtual float volume() const
 {
  return 3.14*R*R*R;
 }
 Cylinder(double r,double h):R(r),H(h){}
protected:
 double R,H;
};
int main()
{
 Cube C1(4);
 Ball B1(3);
 Cylinder Cy1(1,5);
 Solid *p;
 p=&C1;
 cout<<"c1面积："<<p->area()<<' '<<"c1体积："<<p->volume()<<endl;
 p=&B1;
    cout<<"B1面积："<<p->area()<<' '<<"B1体积："<<p->volume()<<endl;
 p=&Cy1;
 cout<<"Cy1面积:"<<p->area()<<' '<<"Cy1体积："<<p->volume()<<endl;
 return 0;

}