Day - 40 Constructors in C++

#include<bits/stdc++.h>

using namespace std;
//Implement the class Box  
//l,b,h are integers representing the dimensions of the box

// The class should have the following functions : 

// Constructors: 
// Box();
// Box(int,int,int);
// Box(Box);


// int getLength(); // Return box's length
// int getBreadth (); // Return box's breadth
// int getHeight ();  //Return box's height
// long long CalculateVolume(); // Return the volume of the box

//Overload operator < as specified
//bool operator<(Box& b)

//Overload operator << as specified
//ostream& operator<<(ostream& out, Box& B)

class Box
{
    int l;
    int b;
    int h;
    
    public:
        Box() : l(0), b(0), h(0) {}
        Box(int length, int breadth, int height) : l(length), b(breadth), h(height) {}
        Box(const Box &box) : l(box.l), b(box.b), h(box.h) {}
        
        int getLength() const { return l;}
        int getBreadth() const {return b;}
        int getHeight() const {return h;}
        
        long long CalculateVolume() const { return (long long)l*(long long)h*(long long)b;}
        
        bool operator<(const Box &b) const
        {
            return this->l < b.l || 
            (this->b < b.b && this->l == b.l) ||
            (this->h < b.h && this->b == b.b && this->l == b.l);
        }
        
        friend ostream& operator<<(ostream& out, const Box& B)
        {
            out << B.l << " " << B.b << " " << B.h;
            return out;
        }
};




void check2()
{
	int n;
	cin>>n;
	Box temp;
	for(int i=0;i<n;i++)
	{
		int type;
		cin>>type;
		if(type ==1)
		{
			cout<<temp<<endl;
		}
		if(type == 2)
		{
			int l,b,h;
			cin>>l>>b>>h;
			Box NewBox(l,b,h);
			temp=NewBox;
			cout<<temp<<endl;
		}
		if(type==3)
		{
			int l,b,h;
			cin>>l>>b>>h;
			Box NewBox(l,b,h);
			if(NewBox<temp)
			{
				cout<<"Lesser\n";
			}
			else
			{
				cout<<"Greater\n";
			}
		}
		if(type==4)
		{
			cout<<temp.CalculateVolume()<<endl;
		}
		if(type==5)
		{
			Box NewBox(temp);
			cout<<NewBox<<endl;
		}

	}
}

int main()
{
	check2();
}