2-4.cpp

一个简单的c++案例

#include<iostream.h>
class figure
{
public:
	figure(double a,double b,double c)
	{
		x=a;
		y=b;
		z=c;
	
	}
	virtual void show()
	{};
protected:
	double x,y;
	double z;
};
class yzhu:public figure
{
public:
	yzhu(double a,double b):figure(a,b,b)
	   {};
	   void show()
	   {
		   cout<<"圆柱体的表面积："<<2*3.14159*x*y<<endl;
		   cout<<"圆柱体的体积："<<3.14159*x*x*y<<endl;
	   }
};
class circle:public figure
{
public:circle(double a):figure(a,a,a)
	   {};
	   void show()
	   {
		   cout<<"球体的表面积："<<4.0/3*3.14159*x*x<<endl;
		   cout<<"球体的体积："<<3.14159*x*x*x<<endl;
	   }
	   };

	  
class zhfang:public figure
{
public:
	zhfang(double a):figure(a,a,a)
	   {};
	   void show()
	   {
		   cout<<"正方体的表面积："<<6*x*x<<endl;
		   cout<<"正方体的体积："<<x*x*x<<endl;
	   }
};
class chfang:public figure
{
public:
	chfang(double a,double b,double c):figure(a,b,c)
	   {};
	   void show()
	   {
		   cout<<"长方体的表面积："<<2*(x*y+y*z+z*x)<<endl;
		   cout<<"长方体的体积："<<x*y*z<<endl;
	   }
	   };

void main()
{
	
	yzhu y(1,2);
	y.show();
	circle c(8);
	c.show();
	zhfang q(6);
	q.show();
	chfang t(6,3,4);
	t.show();
}