composition_of_classes

// Composition of classes 2
/*
 Person class has a member of type Birthday:
 Composition is used for objects that share a has-a relationship, as in "A Person has a
 Birthday */

class Person {
 public:
  Person(string n, Birthday b)
  : name(n),
    bd(b)
  {
  }
 private:
  string name;
  Birthday bd;
};

// EXAMPLE2
#include <iostream>
using namespace std;

class Birthday{
public:
    Birthday(int d, int m, int y)
    :Day(d),Month(m),Year(y){
    }

    void PrintBirthday(){
        cout << Day << "/" << Month << "/" << Year << endl;
    }
private:
    int Day, Month, Year;
};

class People{
public:
    People(string name, Birthday bd)
    :Name(name), Birth(bd){
    }
void PrintInfo(){
        cout << "Name: " << Name << "\n" << "Birthday: ";
        Birth.PrintBirthday();
    }
private:
    string Name;
    Birthday Birth;
};

int main(){
    Birthday Birthday1st(15,10,2003);
    People People1st("Adrit",Birthday1st);

    People1st.PrintInfo();
    return 0;

}

//  ''People's'' constructor, taking two parameters and initializing its private members: name and dateOfBirth
People::People(string x, Birthday bo)
 :name(x), dateOfBirth(bo) 
   {  
   }
   
// a printInfo() function
// Notice that we can call the bd member's printDate() function, since it's of type Birthday, which has that function defined

class Person {
 public:
  Person(string n, Birthday b)
  : name(n),
  bd(b)
  {
  }
  void printInfo()
  {
   cout << name << endl;
   bd.printDate();
  }
 private:
  string name;
  Birthday bd;
};

// define the printInfo() function, which prints ''People's'' name and birthdate, using dateOfBirth's printDate() function

void People::printInfo () 
{
 cout << name << endl;
 dateOfBirth .printDate ();
}