VirtualRestoPoint, C++ (gcc)

VirtualRestoPoint

//g++  7.4.0
//Virtual Resto Point: ADT, derived class and use of pointer to call correct instances and methods
//code is created by Rezaul Hoque on May 08,2021
//please contact at jewelmrh@yahoo.com
#include <iostream>
using namespace std;
 
//This class is the Abstract Data Type with three pure virtual functions,which will be overridden in the subsequent derived classes 
class EatOut{
public:
virtual void greeting()=0;
virtual void menu()=0;
virtual void cost() =0;
virtual void thankYou()=0;
};
void EatOut::thankYou(){
cout<<"Thank you for choosing us.\n";}//implementation of pure virtual function in ADT, rare case, in order to provide common feature in all the subsequent overridden functions 
class Breakfast : public EatOut{
public:
void greeting() { cout<<"Good morning.\n";}
void menu() { cout<<"To kick start your day we are offering:\n";
cout<<" lemonade(1 glass),  rumali roti(2 pieces),  dal bhuna(1 cup), vegetable stew(1 cup) and  chaï( 1 cup).\n";
}
void cost() { cout <<" The Breakfast package costs Tk 50.\n";
}
void thankYou(){ cout<<"Hope you like our breakfast.\n";
EatOut::thankYou();
}
};
class Lunch : public EatOut{
public:
void greeting() { cout<<"Good afternoon.\n";}
void menu() { cout<<"Our lunch menu for one can easily satisfy two people and we are offering:\n";
cout<<" coke(1 glass), shorshe shak(1 plate), rice (2 plates),  lentil soup(1 cup), shol fish dopeyaja(1 cup) and  kheer( 1 cup).\n";
}
void cost() { cout <<" The lunch package costs Tk 90.\n";
}
void thankYou(){ cout<<"Dhonnobad.\n";
EatOut::thankYou();
}
};
class Dinner : public EatOut{
public:
void greeting() { cout<<"Good evening.\n";}
void menu() { cout<<"We have the best dinner menu in the town and we are offering:\n";
cout<<" borhani(1 glass), moglaï parota(1 piece),salad(1 plate) and  mishti doï( 1 cup).\n";
}
void cost() { cout <<" The dinner package costs Tk 50.\n";
}
void thankYou(){ cout<<"Bon appétit.\n";
EatOut::thankYou();
}
};
int main()
{
EatOut *point = NULL;//point is a pointer to EatOut type and initialized to NULL
int pick;
bool fQuit = false;
while(true)// alternatively fQuit== false
{
cout<<"(1) Breakfast (2) Lunch (3) Dinner (0) Quit:\n";
cin>>pick;
switch(pick)
{
//point is used to point to the instances of derived classes 
case 1: point = new Breakfast;
break;
case 2: point = new Lunch;
break; 
case 3: point = new Dinner;
break;
default: fQuit = true;
break;
}
if (fQuit) // fQuit== true
break;
//Reading the user's choice, correct methods are called 
point->greeting();
point->menu();
point->cost();
point->thankYou();
delete point;
cout<<"\n";
}
return 0;
}


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