Virtual Resto, C++ (gcc)

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//g++  7.4.0
//Virtual Resto
// This code is created by Rezaul Hoque on April 30,2021
//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()
{
Breakfast br;
Lunch ln;
Dinner din;
cout<<"  Virtual Resto!\n";
cout<<"****Breakfast****\n";
br.greeting();
br.menu();
br.cost();
br.thankYou();
cout<<"****Lunch****\n";
ln.greeting();
ln.menu();
ln.cost();
ln.thankYou();
cout<<"****Dinner****\n";
din.greeting();
din.menu();
din.cost();
din.thankYou();
return 0;
}

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Compilation time: 0.32 sec, absolute running time: 0.15 sec, cpu time: 0.01 sec, memory peak: 5 Mb, absolute service time: 0,55 sec