C++ Program: Association in class Example :Write a code to associate Two class

 

The association is in a relationship between two classes.In this type of relationship, both classes know about the connection.

Following Example :

• Make three-class Person, Woman , Man
• A person has a class inheritance in Woman and man class 
• Man and Woman class has friend function marry to show they are married 
• Man and woman can do more than one marriage so its multiplicities example 

	#include<iostream>
	using namespace std;
	class Person
	{
	protected:
	string name;
	public:
	Person(string n)
	{
	name=n;
	}
	};
	class Man;
	class Woman:public Person
	{
	private:
	Man *husband;//Object of Man class inside Woman
	public:
	Woman(string n):Person{n},husband{nullptr}{}
	friend void marry(Man &m,Woman &w);// Friend function can use both Man and woman class connect as friend
	friend ostream& operator <<(ostream & out,Woman &w);//operator overloading
	};
	class Man:public Person
	{
	private:
	Woman *wife;//Woman class obj inside man class
	public:
	Man(string n):Person{n},wife{nullptr}{}
	public:
	friend void marry(Man &m,Woman &w);
	friend ostream& operator <<(ostream & out,Man &m);
	friend ostream& operator <<(ostream & out,Woman &w);
	};
	ostream & operator<<(ostream & out,Man &m)
	{
	out<<m.name<<endl;
	return out;
	}
	ostream & operator<<(ostream & out,Woman &w)
	{
	out<<w.name<<endl;
	return out;
	}
	void marry(Man &m,Woman &w)
	{
	m.wife=&w;
	w.husband=&m;
	cout<<m<<" marry to "<<w <<endl;
	}
	int main()
	{
	Man hus("Raj");
	Woman wif("Pooja");
	marry(hus,wif);
	cout<<"Pooja and raj are not married not now "<<endl;
	Man hus2("Sammer");
	marry(hus2,wif);
	return 0;
	}

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Raj marry to Pooja

Pooja and raj are not married not now
Sammer marry to Pooja