c++——this指针

川长思鸟来 2023-08-17 15:44 134阅读 0赞

#include <iostream>
    using namespace std;
    
    class Box 
    { 
    public:
    	Box(double l=2.0,double b=2.0,double h=2.0) 
    	{ 
    		cout << "constructor called." << endl;
    		length = l;
    		breadth = b;
    		height = h;
    	}
    	double Volume() 
    	{ 
    		return length * breadth*height;
    	}
    	int compare(Box box) 
    	{ 
    		return this->Volume()>box.Volume();
    	}
    	Box* get_address() { 
    		return this;
    	}
    
    private:
    	double length;
    	double breadth;
    	double height;
    };
    
    int main() 
    { 
    	Box box1(3.3,1.2,1.5);
    	Box box2(3.4, 1.4, 1.3);
    
    	Box* p = box1.get_address();
    	cout << p << endl;
    
    	p = box2.get_address();
    	cout << p << endl;
    
    	if (box1.compare(box2)) { 
    		cout << "box2 is smaller than box2." << endl;
    	}
    	else { 
    		cout << "box1 is smaller than box2." << endl;
    	}
    }

#include"pch.h"
    #include<iostream>
    
    using namespace std;
    
    class Box{ 
    public:
    	Box() { }
    	~Box(){ }
    	Box* getAddress() { 
    		return this;
    	}
    };
    
    int main() 
    { 
    	Box box1;
    	Box box2;
    
    	Box* box = box1.getAddress();
    	cout << box << endl;
    
    	box = box2.getAddress();
    	cout << box << endl;
    
    	return 0;
    }

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