[HackerRank] Box it! - easy

https://www.hackerrank.com/challenges/box-it/problem

Box It! | HackerRank

class Box{
// The class should have the following functions : 
private:
int l;
int b;
int h;

public:
// Constructors: 
Box()
{
    l=0;
    b=0;
    h=0;
}
Box(int length,int breadth,int height)
{
    l=length;
    b=breadth;
    h=height;
}
 Box(const Box &ref)
 {
     l=ref.l;
     b=ref.b;
     h=ref.h;
 }

int getLength()
{
    return this->l;
} // Return box's length
int getBreadth ()
{
    return b;
} // Return box's breadth
int getHeight ()
{
    return h;
}  //Return box's height
 long long CalculateVolume()
 {
     return (long long)l*b*h;
     }// Return the volume of the box

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


    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)));
}

//Overload operator << as specified
friend ostream& operator<<(ostream& out, Box& B)
{
    out<<B.getLength()<<" "<<B.getBreadth()<<" "<<B.getHeight();
    return out;
}
};