this指针的使用

#include<bits/stdc++.h>
using namespace std;
class rectangle{
	private:
		int length,width;
	public:
		void set(int x,int y){
			length=x;
			width=y;
		}
		int getlength(){
			return length;
		}
		int getwidth(){
			return width;
		}
		int area(){
			return length*width;
		}
		// write your code here......
        string cancover(rectangle b)
        {
            if(this->area()>=b.area())
            {
                return "yes";
            }else
            {
                return "no";    
            }
        }
};
int main(){
	int l1,w1,l2,w2;
	cin>>l1>>w1>>l2>>w2;
	rectangle a,b;
	a.set(l1,w1);
	b.set(l2,w2);
	cout<<a.cancover(b);
	return 0;
}