类和对象-封装-设计案例-立方体类_设计派生类只利用直接基类立方体类的封装

#include<iostream>
#include<string>
using namespace std;
 
//class代表一个类，后面紧跟类名
class Cube
{
public:
	void setm_l(int l)
	{
		m_l = l;
	}
	int getm_l()
	{
		return m_l;
	}
	
	void setm_w(int w)
	{
		m_w = w;
	}
	int getm_w()
	{
		return m_w;
	}
	void setm_h(int h)
	{
		m_h = h;
	}
	int getm_h()
	{
		return m_h;
	}
 
	int getS()
	{
		return 2 * (m_l*m_w + m_l*m_h + m_w*m_h);
	}
 
	int getV()
	{
		return m_l*m_h*m_w;
	}
	//利用成员函数判断两个立方体是否相等
	bool issamebyclass(Cube &c)
	{
		if (m_h == c.getm_h() && m_l == c.getm_l() && m_w == c.getm_w())
			return true;
		return false;
	}
private:
	int m_l; //
	int m_w;     //
	int m_h;//
};
 
//全局函数判断两个立方体是否相等
bool issame(Cube &c1, Cube &c2)
{
	if (c1.getm_h() == c2.getm_h() && c1.getm_l() == c2.getm_l() && c1.getm_w() == c2.getm_w())
		return true;
	return false;
}
int main()
{
	Cube c1;
	
	c1.setm_l(1);
	c1.setm_w(2);
	c1.setm_h(3);
	cout << "c1的面积为：" << c1.getS() << endl;
	cout << "c1的体积为：" << c1.getV() << endl;
 
	Cube c2;
	c2.setm_l(1);
	c2.setm_w(2);
	c2.setm_h(3);
	//全局函数判断是否相等
	bool reet = issame(c1, c2);
	if (reet)
	{
		cout << "c1和c2相等" << endl;
	}
	else
	{
		cout << "c1和c2不等" << endl;
	}
 
	Cube c3;
	c3.setm_l(2);
	c3.setm_w(2);
	c3.setm_h(3);
	//成员函数判断是否相等
	bool ret = c1.issamebyclass(c3);
	if (ret)
	{
		cout << "c1和c3相等" << endl;
	}
	else
	{
		cout << "c1和c3不等" << endl;
	}
	system("pause");
	return 0;
}