十四周项目3

来源：互联网发布：电信4g网络不稳定编辑：程序博客网时间：2024/05/02 21:32

代码;

#include<iostream>
#define PI 3.1415926
using namespace std;
class CSolid{
public:
virtual double area()=0;
virtual double voumal()=0;
};
class CCube:public CSolid{
public:
   CCube(double x):x(x){}
   double area(){
   return x*x*6;
   }
double voumal(){
    return x*x*x;
}
private:
double x;

};
class CBall:public CSolid{
public:
CBall(double r):r(r){}
double area(){

return 4*PI*r*r;
}
double voumal(){
return 4/3*PI*r*r*r;
}

private:
double r;

};
class CCylinder:public CSolid{
public:
CCylinder(double r,double h):r(r),h(h){}
double area(){

return PI*r*r*2+2*PI*r*h;
}
double voumal(){
return PI*r*r*h;
}

private:
double r,h;

};
int main(){
   CSolid *p;
   CCube a(12);
   p=&a;
   cout<<"边长是12的正方体表面积是"<<p->area()<<endl;
   cout<<"边长是12的正方体体积是"<<p->voumal()<<endl;
   CBall b(4);
   p=&b;
   cout<<"半径是4的球体表面积是"<<p->area()<<endl;
   cout<<"半径是4的球方体体积是"<<p->voumal()<<endl;
   CCylinder c(2,3);
   p=&c;
   cout<<"底面半径是2，高是3的圆柱体表面积是"<<p->area()<<endl;
   cout<<"底面半径是2，高是3的圆柱体体积是"<<p->voumal()<<endl;

return 0;
}

运行结果：