Question

C++程序设计表面积和体积的计算程序,简单些，与别人不一样就好

大神们，事情很急的，求速解。。。谢谢
要求就在图片上，亲们

Answer 1

#include <iostream>
using namespace std;
#define PI 3.1415926
class Area
{
public:
	virtual double biaoarea()=0;
	virtual double volumn()=0;
};

class Ball:public Area
{
private:
	double r;
public:
	Ball():Area()
	{
		r=0.0;
	}

	virtual double biaoarea()
	{
		double k;
		k=4.0*PI*r*r;
		return k;
	}
	virtual double volumn()
	{
		double k=4.0/3.0;
		k=k*PI*r*r*r;
		return k;
	}
	void set(double t)
	{
		r=t;
	}
};

class Cube:public Area
{
private:
	double length;
	double width;
	double high;
public:
	Cube():Area()
	{
		length=0.0;
		width=0.0;
		high=0.0;
	}
	virtual double volumn()
	{
		double k;
		k=length*width*high;
		return k;
	}
	virtual double biaoarea()
	{
		double k;
		k=2.0*(length*width+length*high+width*high);
		return k;
	}
	void set(double a,double b,double c)
	{
		length=a;
		width=b;
		high=c;
	}
};

class Cylinder:public Area
{
private:
	double r;
	double high;
public:
	Cylinder():Area()
	{
		r=0.0;
		high=0.0;
	}
	virtual double biaoarea()
	{
		double k;
		k=PI*r*r+2.0*PI*r*high;
		return k;
	}
	virtual double volumn()
	{
		double k;
		k=PI*r*r*high;
		return k;
	}
	void set(double a,double b)
	{
		r=a;
		high=b;
	}
};


class Taper:public Area
{
private:
	double r;
	double l;
	double hight;
public:
	Taper():Area()
	{
		r=0.0;
		l=0.0;
		hight=0.0;
	}
	virtual double biaoarea()
	{
		double k;
		k=PI*r*r+PI*r*l;
		return k;
	}
	virtual double volumn()
	{
		double k;
		k=(1.0/3.0)*PI*r*r*hight;
		return k;
	}
	void set(double a,double b,double c)
	{
		r=a;
		l=b;
		hight=c;
	}
};
int main()
{
	double length,width,high,rr;
	Ball mm;
	Cube nn;
	Taper kk;
	Cylinder tt;
	int chioce;
	do 
	{
		cout<<"请输入你需要计算的集合体：（1.球   2.立方体  3.圆锥体  4.圆柱体  5.退出）："<<endl;
		cin>>chioce;
		switch(chioce)
		{
		case 1:
			cout<<"请输入需要计算的球的半径r：";
			cin>>rr;
			mm.set(rr);
			cout<<"该球的表面积为："<<mm.biaoarea()<<endl;
			cout<<"该球的体积为：  "<<mm.volumn()<<endl;
			break;
		case 2:
			cout<<"请输入需要计算的立方体的长、宽、高：";
			cin>>length>>width>>high;
			nn.set(length,width,high);
			cout<<"该立方体的表面积为："<<nn.biaoarea()<<endl;
			cout<<"该立方体的体积为：  "<<nn.volumn()<<endl;
			break;
		case 3:
			cout<<"请输入需要计算的圆锥体的半径、母线长、高：";
			cin>>rr>>length>>high;
			kk.set(rr,length,high);
			cout<<"该圆锥的表面积为："<<kk.biaoarea()<<endl;
			cout<<"该圆锥体的体积为："<<kk.volumn()<<endl;
			break;
		case 4:
			cout<<"请输入需要计算的圆柱体的半径和高：";
			cin>>rr>>high;
			tt.set(rr,high);
			cout<<"该圆柱体的表面积为："<<tt.biaoarea()<<endl;
			cout<<"该圆柱体的体积为：  "<<tt.volumn()<<endl;
			break;
		case 5:
			cout<<"退出成功！"<<endl;
			break;
		default:
			cout<<"输入错误，请重新输入！"<<endl;
			break;
		}
	} while (chioce != 5);
	return 0;
}

Answer 2

楼上的函数写错了。
double CCube::area()const
{
return light*light;
}
以及
CCube x(10);
cout<<"立方体边长为30"<<endl;

Answer 3

#include <iostream>

using namespace std;

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

class CCube:public CSolid
{
public:
CCube(double l):light(l) {}
virtual double area() const;
virtual double volume()const;
private:
double light;
};

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

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

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

double CBall::area()const
{
return 4*3.14*radius*radius;
}

double CBall::volume()const
{
return (4*3.14*radius*radius*radius)/3;
}

class CCylinder:public CSolid
{
public:
CCylinder(double r,double h):radius(r),height(h) {}
virtual double area()const;
virtual double volume()const;
private:
double radius;
double height;
};

double CCylinder::area()const
{
return (2*(3.14*radius*height+3.14*radius*radius));
}

double CCylinder::volume()const
{
return 3.14*radius*radius*height;
}

int main( )
{
CSolid *p;
double s,v;
CCube x(10);
cout<<"立方体边长为30"<<endl;
p=&x;
s=p->area( );
v=p->volume( );
cout<<"表面积："<<s<<endl;
cout<<"体积："<<v<<endl;
cout<<endl;
CBall y(5);
cout<<"球体半径为5"<<endl;
p=&y;
s=p->area( );
v=p->volume( );
cout<<"表面积："<<s<<endl;
cout<<"体积："<<v<<endl;
cout<<endl;
CCylinder z(10,20);
cout<<"圆柱体底面半径、高分别为10, 20"<<endl;
p=&z;
s=p->area( );
v=p->volume( );
cout<<"表面积："<<s<<endl;
cout<<"体积："<<v<<endl;
cout<<endl;
return 0;
}
其他的，直接继承基类，然后写个计算公式就可以了