NamespaceOverload, C++ (gcc)

NamespaceOverload

//g++  7.4.0
//namespace & operator overloading: use of different namespaces and operator overloading
//this code is created by Rezaul Hoque on August 29,2021;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>
namespace Garden{
class Vegetable{
friend int operator==( const Vegetable& x, const Vegetable& y){
return (x.l*x.b == y.l*y.b) ;}//equality operator
private:
int l, b;
public:
Vegetable (){}//default constructor
Vegetable (int vl,int vb){ l=vl; b=vb;}//Vegetable(int,int ) constructor
Vegetable (const Vegetable& v){l=v.l; b=v.b;}//copy constructor

Vegetable& operator=(const Vegetable& eq){ l=eq.l; b=eq.b; return *this;}//assignment operator
int area(){return l*b;}
void greet(){ std::cout<<"This is the vegetable plot.";}
void tomato(){std::cout<<"tomato ";}
void cucumber(){std::cout<<"cucumber ";}
void pumpkin(){std::cout<<" pumpkin";}
void ocra(){ std::cout<<"ocra ";}
void lettuce(){std::cout<<"lettuce";}
void brinjal(){std::cout<<"brinjal ";}
};

class Flower{
friend int operator==( const Flower& x, const Flower& y){
return (x.l*x.b == y.l*y.b) ;}
private:
int l, b;
public:
Flower(){}
Flower(int fll,int flb){ l=fll; b=flb;}
Flower(const Flower& f){l=f.l; b=f.b;}
Flower& operator=(const Flower& eq){ l=eq.l; b=eq.b; return *this;}
int area(){ return l*b;}
void greet(){ std::cout<<"This is the flower plot.";}
void rose(){ std::cout<<"rose";}
void nightqueen(){std::cout<<"night queen ";}
void chirose(){std::cout<<"china-rose\t";}
void sunfl(){std::cout<<"sunflower.";}

};
class Fruit {
friend int operator==( const Fruit& x, const Fruit& y){
return (x.l*x.b == y.l*y.b);}
private:
int l, b;
public:
Fruit(){}
Fruit (int fl,int fb){ l=fl; b=fb;}
Fruit (const Fruit& f){l=f.l; b=f.b;}
Fruit& operator=(const Fruit& eq){ l=eq.l; b=eq.b; return *this;}
int area(){ return l*b;}

void greet(){ std::cout<<"This is the fruit plot.";}
void guava(){std::cout<<"guava ";}
void mango(){std::cout<<"mango\t";}
void muskmelon(){std::cout<<"muskmelon\t";}
void jujube (){std::cout<<"jujube\t";}
void strawberry(){std::cout<<"strawberry";}
void papaya(){std::cout<<"papaya ";}
};
}
namespace Greetings{
void Start(){std::cout<<"Welcome to my garden.";}
void Pose(){std::cout<<"Isn’t it beautiful?";}
void Fin(){std::cout<<"Hope you enjoy the tour at my garden.";}
void look(){std::cout<<"Over there,that’s my neighbor's garden.\t";}

}
int main()
{
Garden::Vegetable veg(4,5),veg2(5,4),veg3;
Garden::Flower flow(4,4),flow2(3,4);
Garden::Fruit fr(6,5),fr2(7,5);
Greetings::Start();
std::cout<<"\n";
veg.greet();
std::cout<<"\n";
std::cout<<"Here we have ";
veg.tomato();
std::cout<<",";
veg.cucumber();
std::cout<<"&";
veg.pumpkin();
std::cout<<".";
std::cout<<" \n";
Greetings::Pose();
std::cout<<"\n";
flow.greet();
std::cout<<"\n";
std::cout<<"Here we have ";
flow.nightqueen();
std::cout<<"&";
flow.rose();
std::cout<<".";
std::cout<<"\n";
Greetings::Pose();
std::cout<<"\n";
fr.greet();
std::cout<<"\n";
std::cout<<"Here we have ";
fr.guava();
std::cout<<",";
fr.papaya();
std::cout<<"& ";
fr.strawberry();
std::cout<<".";
std::cout<<"\n";
Greetings::look();
std::cout<<"There,in the vegetable plot,he grows ";
veg2.ocra();
std::cout<<",";
veg2.brinjal();
std::cout<<"& ";
veg2.lettuce();
std::cout<<".";
std::cout<<"\n";
std::cout<<"There, in the flower plot,he grows ";
flow2.chirose();
std::cout<<"& ";
flow2.sunfl();
std::cout<<"\n";
std::cout<<"Sizes of my vegetable plot,flower plot and fruit plot are "<<veg.area()<<" sq. meter"<<flow.area()<<" sq. meter & "<<fr.area()<<" sq. meter respectively.\n";
veg3=veg;//assignment operator is called
if(veg3==veg2) //equality operator is called
std::cout<<"Me and my neighbor have  vegetable plots of same size but we grow different crops.\n";
else
std::cout<<"Me and my neighbor have  vegetable plots of different size and we grow different crops.\n";

Greetings::Fin();
return 0;
}


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