Op&&^Overload, C++ (gcc)

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//g++  7.4.0
//operator overloading: exponentiation and inverse exponentiation
//this code is created by Rezaul Hoque on September 06,2021;contact: jewelmrh@yahoo.com

//note: codes shared by Rezaul Hoque on rextester are not for sale; they are created and shared to facilitate the algorithm learning process; many like Hoque use this platform to practice programming ;Rezaul hopes his contribution helps others to fine tune their learning;

#include <iostream>
#include <cmath>

namespace Garden{
class Vegetable{
private:
double l, b,m;
public:
Vegetable (){}//default constructor
Vegetable (double k){m=k;}
Vegetable (double vl, double vb){ l=vl; b=vb;}
//Vegetable(double,double ) constructor
Vegetable (const Vegetable& v){l=v.l; b=v.b;}//copy constructor
Vegetable operator&&(const int & n);//exponentiation operator
Vegetable operator^(const int & n);// inverse exponentiation operator
Vegetable operator+(const Vegetable &);
const Vegetable & operator++();
double area(){return l*b;}
double getm() { return m;}
double getl(){ return l;}
double getb(){return b;}

};
Vegetable Vegetable::operator &&(const int& n)
{
 return Vegetable(pow(m,n));
}
Vegetable Vegetable:: operator^(const int& n)
{
return Vegetable(pow(1/m,n));
}
Vegetable Vegetable:: operator+(const Vegetable & add)
{
return Vegetable (l+add.l,b+add.b);
}
const Vegetable & Vegetable:: operator++()
{
++l;
++b;
return *this;
}
}
int main()
{
Garden::Vegetable veg1(2,4),veg2(3,5),veg3,veg4;
int m=veg1.area();
std::cout<<"veg1 area= "<<m<<"\n";

veg3=veg1+veg2;
std::cout<<"\nveg3 length = "<<veg3.getl()<<"\n";
std::cout<<"veg3 breadth = "<<veg3.getb()<<"\n";
Garden::Vegetable p= Garden::Vegetable(2);//this is called veg4
Garden::Vegetable q=p&&3;
Garden::Vegetable r= Garden::Vegetable(3);//this is called veg5
Garden::Vegetable o=r^3;

std::cout<<"After exponentiation of veg4: "<< q.getm();
std::cout<<"\nInverse exponentiation of veg5: "<<o.getm();
return 0;
}

Show compiler warnings [ + ] Compiler args [ + ] Show input
Compilation time: 0.42 sec, absolute running time: 0.15 sec, cpu time: 0.01 sec, memory peak: 5 Mb, absolute service time: 0,62 sec