C++语言特性演示 - 类与对象

本文一些代码的形式演示c++语言的特性，关于环境的搭建可以参考 设置 Windows 下的GCC开发环境

1. 代码: c1.cpp

#include<bits/stdc++.h>  
using namespace std;

class Cpoint {
 private:  
     int X,Y; 
 public:  
    void print() {
        cout<<X<<Y; 
    }
    void set(int x,int y) { 
        X=x;  
        Y=y;
    }
};

int main() {
   Cpoint p1,p2;
   p1.set(3,5);
   p2.set(8,10);
   p1.print();
   p2.print();
}

2. 代码: c2.cpp

class Cpoint {
 private:  
     int X,Y; 
 public:
    Cpoint(int a, int b) {
        X = a;
        Y = b;
    }
    void print() {
        cout<<X<<Y; 
    }
    void set(int x,int y) { 
        X=x;  
        Y=y;
    }
};

int main() {
   Cpoint p1(1,10);
   p1.print();
}

3. 代码 c3.cpp

#include<bits/stdc++.h>  
using namespace std;

class Cpoint {
 private:  
     int X,Y; 
 public:
    Cpoint() {
        this->X = 10;
        this->Y = 20;
    }
    void print() {
        cout<<X<<Y; 
    }
};

int main() {
   Cpoint p1;
   p1.print();
}

4. c4.cpp

#include<bits/stdc++.h>  
using namespace std;

class Cpoint {
 private:  
     int X,Y; 
 public:
    Cpoint(int a, int b) {
        this->X = a;
        this->Y = b;
    }

    void print() {
        cout<<X<<Y; 
    }
    Cpoint(Cpoint &p){
        X=p.X; 
        Y=p.Y;
        cout<<"copy initialization called.\n";
    }
    ~Cpoint() {
        cout<<"destructor called\n";
    }

};

int main() {
    Cpoint p1(5,7);
    Cpoint p2(p1); 
    p2.print();  
}

5. c4.cpp

#include<bits/stdc++.h>  
using namespace std;

class Cpoint {
 private:  
     int X,Y; 
 public:
    Cpoint(int a, int b) {
        this->X = a;
        this->Y = b;
    }

    void print() {
        cout<<X<<Y; 
    }
    Cpoint(Cpoint &p){
        X=p.X; 
        Y=p.Y;
        cout<<"copy initialization called.\n";
    }
    ~Cpoint() {
        cout<<"destructor called\n";
    }

};

class  Cpoint1: public Cpoint {
 private:
    int Z; 
 public:
    Cpoint1(int a, int b, int c): Cpoint(a, b) {
        Z = c;
    }

    void print1() {
        cout<<Z;
    }
    void set1(int z) { 
        Z=z;
    }
};

int main() {
    Cpoint1 p1(10, 20, 30);
    p1.print();
    p1.print1();
}

6. c6.cpp

#include<bits/stdc++.h>  
using namespace std;

class point {
 int x,y;
 public:
    point(int x1,int y1) {
        x=x1;
        y=y1;
    }
    virtual int area() {
        return 0;
    }
};

class rect:public point {
    int l,w;
public:
    rect(int x1,int y1,int l1,int w1): point(x1,y1) {
        l=l1;
        w=w1;
    }
    int area() {
        return l * w;
    }
};


void fun(point &p)  {
    cout<<p.area()<<endl;
}

int main() {
    point p(10, 10);
    fun(p);
    rect rec(2,4,10,6);
    fun(rec);
}