初识c++

小鱼儿 2022-07-13 10:45 217阅读 0赞

这几天一直在写网络编程，感觉有点枯燥，今天在看了半个小时的网络后，开始看c++。因为学过c的缘故，c++上手的时候感觉不怎么难，比较容易理解，前面几章看的比较快，在看到构造函数和析构函数、共有结点与友元还有单继承和多继承的时候，感觉就有点吃力了。在理解了几个程序后，大概也理解了60%吧。

1、带参数的构造函数

/*********************************************************************
    File Name:               gouzao.cpp
    Author:                          date:
    Description:            
    Fuction List:			
    ********************************************************************/
    #include <iostream>
    #include <string.h>
    
    using namespace std;
    
    class Cshose
    {
    	public:
    		Cshose();
    		Cshose(int s, char* strcolor);
    		~Cshose();
    		int getsize();
    		char* getcolor();
    	
    	private:
    		int size;
    		char color[10];
    };
    
    Cshose::Cshose()
    {
    	size = 40;
    	strcpy(color, "红色");
    }
    
    Cshose::Cshose(int s, char* strcolor)
    {
    	size = 40;
    	strcpy(color, strcolor);
    }
    
    int Cshose::getsize()
    {
    	return size;
    }
    
    char* Cshose::getcolor()
    {
    	return color;
    }
    
    Cshose::~Cshose()
    {
    	cout<<"销毁对象！"<<endl;
    }
    
    int main()
    {
    	Cshose shose1;
    	Cshose shose2(38,"白色");
    	
    	cout<<"休闲鞋的尺寸为："<<shose1.getsize()<<"\t颜色为："<<shose1.getcolor()<<endl;
    	cout<<"休闲鞋的尺寸为："<<shose2.getsize()<<"\t颜色为："<<shose2.getcolor()<<endl;
    	
    	return 0;
    }

2、子类的构造函数

#include <iostream>
    
    using namespace std;
    
    class Cpoint
    {
    	public:
    		Cpoint();
    		Cpoint(int x, int y);
    		void disp();
    		void getxy(int &x, int &y);
    	
    	private:
    		int m_x;
    		int m_y;
    };
    
    Cpoint::Cpoint()
    {
    	m_x = 0;
    	m_y = 0;
    	cout<<"调用Cpoint默认构造函数"<<endl;
    }
    
    Cpoint::Cpoint(int x, int y)
    {
    	m_x = x;
    	m_y = y;
    	cout<<"调用Cpoint构造函数"<<endl;
    }
    
    void Cpoint::getxy(int &x, int &y)
    {
    	x = m_x;
    	y = m_y;
    }
    
    void Cpoint::disp()
    {
    	cout<<m_x<<","<<m_y<<endl;
    }
    
    class C3point:public Cpoint
    {
    	public:
    		C3point();
    		C3point(int x, int y, int z);
    		void disp();
    		
    	private:
    		Cpoint p;
    		int m_z;
    };
    
    C3point::C3point():Cpoint()
    {
    	m_z = 0;
    	cout<<"调用C3point默认构造函数"<<endl;
    }
    
    C3point::C3point(int x, int y, int z):Cpoint(x, y),p(x, y)
    {
    	m_z = z;
    	cout<<"调用C3point构造函数"<<endl;
    }
    
    void C3point::disp()
    {
    	int x;
    	int y;
    	p.getxy(x, y);
    	cout<<x<<","<<y<<","<<m_z<<endl;
    }
    
    int main()
    {
    	C3point point1;
    	C3point point2(50, 80, 10);
    	Cpoint p(20,30);
    	
    	p.disp();
    	point1.disp();
    	point2.disp();
    	
    	return 0;
    }