Dark horse programmer's ingenuity-package examples

Problem Description:

 

Core 1: In a class, you can make another class as a member of this class . 

//要求：
//判断点与圆的关系
#include<iostream>
#include<string>
using namespace std;

class Circle
{
public:

	void setm_R(double R)
	{
		m_R = R;
	}

	double readm_R()
	{
		return m_R;
	}
	void setcenter(CenterPoint theP)
	{
		p = theP;
	}
	double readcenter_x()
	{
		return p.readpoint_x();
	}
	double readcenter_y()
	{
		return p.readpoint_y();
	}
private://属性设置为私有
	double m_R;
	point p;
	
};
class point
{
public:

	void setpoint_x(double thex)
	{
		point_x = thex;
	}
	double readpoint_x()
	{
		return point_x;
	}
	void setpoint_y(double they)
	{
		point_y = they;
	}
	double readpoint_y()
	{
		return point_y;
	}
private:
	double point_x;
	double point_y;
};
void isSame(Circle c, point p)
{
	if ((p.readpoint_x() - c.readcenter_x()) * (p.readpoint_x() - c.readcenter_x()) +
		(p.readpoint_y() - c.readcenter_y()) * (p.readpoint_y() - c.readcenter_y()) > c.readm_R() * c.readm_R())
	{
		cout << "点在圆外" << endl;
	}
	else if ((p.readpoint_x() - c.readcenter_x()) * (p.readpoint_x() - c.readcenter_x()) +
		(p.readpoint_y() - c.readcenter_y()) * (p.readpoint_y() - c.readcenter_y()) == c.readm_R() * c.readm_R())
	{
		cout << "点在圆上" << endl;
	}
	else
	{
		cout << "点在圆内" << endl;
	}
}
int main()
{
	point cp;
	cp.settpoint_x(10);
	cp.settpoint_y(0);
	Circle c;
	c.setm_R(10);
	c.setcenter(cp);
	point p;
	p.setpoint_x(10);
	p.setpoint_y(9);
	isSame(c, p);
	
	system("pause");
	return 0;
	
}

Core 2: How to split a class into different files: split a class into .h (header file) and .cpp (source file)

.h contains declarations of functions and variables;

.cpp only contains specific functions;

//要求：
//判断点与圆的关系
#include<iostream>
#include<string>
#include"point.h"
#include"Circle.h"
using namespace std;
void isSame(Circle c, point p)
{
	if ((p.readpoint_x() - c.readcenter_x()) * (p.readpoint_x() - c.readcenter_x()) +
		(p.readpoint_y() - c.readcenter_y()) * (p.readpoint_y() - c.readcenter_y()) > c.readm_R() * c.readm_R())
	{
		cout << "点在圆外" << endl;
	}
	else if ((p.readpoint_x() - c.readcenter_x()) * (p.readpoint_x() - c.readcenter_x()) +
		(p.readpoint_y() - c.readcenter_y()) * (p.readpoint_y() - c.readcenter_y()) == c.readm_R() * c.readm_R())
	{
		cout << "点在圆上" << endl;
	}
	else
	{
		cout << "点在圆内" << endl;
	}
}
int main()
{
	point cp;
	cp.setpoint_x(10);
	cp.setpoint_y(0);
	Circle c;
	c.setm_R(10);
	c.setcenter(cp);
	point p;
	p.setpoint_x(10);
	p.setpoint_y(9);
	isSame(c, p);
	
	system("pause");
	return 0;
	
}

point.h 

#pragma once
#include<iostream>
using namespace std;
class point
{
public:

	void setpoint_x(double thex);
	
	double readpoint_x();
	
	void setpoint_y(double they);
	
	double readpoint_y();
	
private:
	double point_x;
	double point_y;
};

point.cpp

#include"point.h"
void point::setpoint_x(double thex)//point作用域下的成员函数
{
	point_x = thex;
}
double point::readpoint_x()
{
	return point_x;
}
void point::setpoint_y(double they)
{
	point_y = they;
}
double point::readpoint_y()
{
	return point_y;
}

	

Circle.h

#pragma once
#include<iostream>
#include"point.h"
using namespace std;
class Circle
{
public:

	void setm_R(double R);
	
	double readm_R();
	
	void setcenter(point theP);
	
	double readcenter_x();
	
	double readcenter_y();
	
private://属性设置为私有
	double m_R;
	point p;

};

Circle.cpp

#include"Circle.h"
void Circle::setm_R(double R)
{
	m_R = R;
}

double Circle::readm_R()
{
	return m_R;
}
void Circle::setcenter(point theP)
{
	p = theP;
}
double Circle::readcenter_x()
{
	return p.readpoint_x();
}
double Circle::readcenter_y()
{
	return p.readpoint_y();
}