笑死，和宝哥同时生病了 

一，封装-案例

1.0 立方体类

#include<iostream>//分别用全局函数和成员函数判定立方体是否相等
using namespace std;class Cube
{
public:int m_area;int m_vol;int geth(){return m_h;}int getl() { return m_l; }int getw() { return m_w; }void setcube(int h,int l,int w){m_h = h;m_l = l;m_w = w;}int getarea(int h, int l, int w){int area = 2 * (h * l + h * w + l * w);return area;}int getvolume(int h, int l, int w){int vol = h * l * w;return vol;}int ifsamehlw(Cube c1, Cube c2){if ((c1.m_h + c1.m_l + c1.m_w) == (c2.m_h + c2.m_l + c2.m_w))//和相等{if (c1.m_h != c2.m_h || c1.m_h != c2.m_l || c1.m_h != c2.m_w)//一条边相等{if (c1.m_l != c2.m_h || c1.m_l != c2.m_l || c1.m_l != c2.m_w)//两条边相等{return 1;}}}return 0;}int ifsamehlwtt(Cube &c2)//{if ((m_h + m_l + m_w) == (c2.m_h + c2.m_l + c2.m_w))//和相等{if (m_h != c2.m_h || m_h != c2.m_l || m_h != c2.m_w)//一条边相等{if (m_l != c2.m_h || m_l != c2.m_l || m_l != c2.m_w)//两条边相等{return 1;}}}return 0;}
private:int m_h;int m_l;int m_w;
};
bool ifsame(Cube& c1, Cube& c2);//不能放在类的前面！显示未设定的标识符
int main()
{Cube c1, c2;c1.setcube(3, 5, 6);c2.setcube(6, 5, 3);c1.m_area = c1.getarea(c1.geth(), c1.getl(), c1.getw());c1.m_vol= c1.getvolume(c1.geth(), c1.getl(), c1.getw());cout << "C1面积" << c1.m_area << "\tC1体积" << c1.m_vol << endl;c2.m_area = c2.getarea(c2.geth(), c2.getl(), c2.getw());c2.m_vol = c2.getvolume(c2.geth(), c2.getl(), c2.getw());cout << "C2面积" << c1.m_area << "\tC2体积" << c1.m_vol << endl;if (c1.ifsamehlw(c1, c2))//可以用，但是有点奇怪{cout << "xiangdneg" << endl;}if (c1.ifsamehlwtt(c2))//正常了，笑死{cout << "xiangdneg" << endl;}if (ifsame(c1, c2))//int &c1=c1；变量传入参数，用引用的方式接受，看不见的赋值运算{cout << "xiangdneg" << endl;}return 0;system("pause");
}//bool逻辑
bool ifsame(Cube& c1, Cube& c2)//引用的方式传递，不会再拷贝一份数据了
{if (c1.geth() + c1.getl() + c1.getw() == c2.geth() + c2.getl() + c2.getw())//和相等{if (c1.geth() != c2.geth() || c1.geth() != c2.getl() || c1.geth() != c2.getw())//一条边相等{if (c1.getl() != c2.geth() || c1.getl() != c2.getl() || c1.getl() != c2.getw())//两条边相等{return true;}}}return false;
}

1.1 点和⚪关系

0.1 没有嵌套

#include<iostream>//判断点和圆的位置关系
using namespace std;
class Circle
{int c_x;int c_y;int c_r;
public:void setc(int x, int y, int r){c_x = x;c_y = y;c_r = r;}int getcx() { return c_x; };int getcy() { return c_y; };int getcr() { return c_r; };
};
class Point
{int p_x;int p_y;
public:void setp(int x, int y){p_x = x;p_y = y;}int getpx() { return p_x; };int getpy() { return p_y; };
};
void relaction(Circle& c, Point& p);
int main()
{Circle c;Point p,p1;c.setc(0, 0, 10);p.setp(10, 0);p1.setp(11, 0);relaction(c, p);relaction(c, p1);return 0;system("pause");
}void relaction(Circle &c, Point &p)
{int distance = (c.getcx() - p.getpx()) * (c.getcx() - p.getpx()) +(c.getcy() - p.getpy()) * (c.getcy() - p.getpy());int rdistance = c.getcr() * c.getcr();if (distance == rdistance){cout << "点("<<p.getpx()<<","<<p.getpy()<<")在圆上" << endl;}else if (distance > rdistance){cout << "点(" << p.getpx() << "," << p.getpy() << ")在圆外" << endl;}else{cout << "点(" << p.getpx() << "," << p.getpy() << ")在圆内" << endl;}
}

0.2 嵌套类

#include<iostream>//判断点和圆的位置关系
using namespace std;
class Point
{int p_x;int p_y;
public:void setp(int x, int y){p_x = x;p_y = y;}int getpx() { return p_x; };int getpy() { return p_y; };
};
class Circle
{Point c_center;int c_r;
public:void setcr( int r){c_r = r;}void setcenter(Point &center){c_center = center;//两个点类相等就行}Point getcenter(){return c_center;}/*不对—不能直接访问点C_CENTER，只能通过行为访问int getcx() { return c_center.getpx(); };int getcy() { return c_center.getpy(); };*/int getcr() { return c_r; };
};
void relaction(Circle& c, Point& p);
int main()
{Circle c;Point p,p1,p2,center;//c.c_center.setp(0, 0);不可访问center.setp(0, 0);p.setp(10, 0);p1.setp(9, 0);p2.setp(12, 0);//初始化圆类c.setcr(10);c.setcenter(center);relaction(c, p);relaction(c, p1);relaction(c, p2);return 0;system("pause");
}void relaction(Circle &c, Point &p)
{int distance = (c.getcenter().getpx() - p.getpx()) * (c.getcenter().getpx() - p.getpx()) +(c.getcenter().getpy() - p.getpy()) * (c.getcenter().getpy() - p.getpy());int rdistance = c.getcr() * c.getcr();if (distance == rdistance){cout << "点("<<p.getpx()<<","<<p.getpy()<<")在圆上" << endl;}else if (distance > rdistance){cout << "点(" << p.getpx() << "," << p.getpy() << ")在圆外" << endl;}else{cout << "点(" << p.getpx() << "," << p.getpy() << ")在圆内" << endl;}
}

0.3 嵌套且分文件

调试的时候发现，全局函数运行的时候，每到一个局部函数就会跳到类里面执行，就还蛮好玩的乐 ，今天就学这么多吧，噶

#pragma once//防止重复包含
#include <iostream>
using namespace std;//头文件只保存声明
class Point
{int p_x;int p_y;
public:void setp(int x, int y);int getpx();int getpy();
};

#pragma once
#include <iostream>
#include "point.h"
using namespace std;class Circle
{Point c_center;int c_r;
public:void setcr(int r);void setcenter(Point& center);Point getcenter();int getcr() ;
};

#include "point.h"//只保留行为语句,函数的实现void Point::setp(int x, int y)//加上作用域，不加上就是全局函数
{Point::p_x = x;Point::p_y = y;
}
int Point::getpx() { return Point::p_x; }
int Point::getpy() { return Point::p_y; }

#include "point.h"
#include "circle.h"void Circle::setcr(int r)
{Circle::c_r = r;
}
void Circle::setcenter(Point& center)
{Circle::c_center = center;//两个点类相等就行
}
Point Circle::getcenter()
{return Circle::c_center;
}
int Circle::getcr(){ return Circle::c_r; }

 

#include<iostream>//判断点和圆的位置关系
using namespace std;
#include "point.h"
#include "circle.h"void relaction(Circle& c, Point& p);
int main()
{Circle c;Point p,p1,p2,center;//c.c_center.setp(0, 0);不可访问center.setp(0, 0);p.setp(10, 0);p1.setp(9, 0);p2.setp(12, 0);//初始化圆类c.setcr(10);c.setcenter(center);relaction(c, p);relaction(c, p1);relaction(c, p2);return 0;system("pause");
}void relaction(Circle &c, Point &p)
{int distance = (c.getcenter().getpx() - p.getpx()) * (c.getcenter().getpx() - p.getpx()) +(c.getcenter().getpy() - p.getpy()) * (c.getcenter().getpy() - p.getpy());int rdistance = c.getcr() * c.getcr();if (distance == rdistance){cout << "点("<<p.getpx()<<","<<p.getpy()<<")在圆上" << endl;}else if (distance > rdistance){cout << "点(" << p.getpx() << "," << p.getpy() << ")在圆外" << endl;}else{cout << "点(" << p.getpx() << "," << p.getpy() << ")在圆内" << endl;}
}