PRA_16

/* A program to use friend function to swap data of two classes using call by reference. */

#include<iostream>

using namespace std;

class ar_2;//forward declaration

class ar_1
{
	int a[100],n;
	public:
		
		void getElemnt()
		{
			cout <<"ARRAY 1"<< endl << "Enter number of Elements : ";
			cin >> n;
			cout << endl << "Enter "<<n<<" Elements :"<< endl;
			for(int i=0;i<n;i++)
			{
				cin >> a[i];
			}
			cout << endl ;
		}
	void putElemnt()
	{
		cout <<endl<<"ARRAY 1"<<endl << "Present Elements :";
		for(int i=0;i<n;i++)
		{
			cout << a[i] << "\t";
		}
		cout << endl;
		
	}	
		friend void tranElemnt(ar_1 &,ar_2 &);
};

class ar_2
{
	int a[100],n;
	public:	
	void getElemnt()
	{
		cout <<"ARRAY 2"<< endl << "Enter number of Elements : ";
		cin >> n;
		cout << endl << "Enter "<<n<<" Elements :"<< endl;
		for(int i=0;i<n;i++)
		{
			cin >> a[i];
		}
		cout << endl ;
	}
	void putElemnt()
	{
		cout <<endl<<"ARRAY 2"<<endl << "Present Elements :";
		for(int i=0;i<n;i++)
		{
			cout << a[i] << "\t";
		}
		cout << endl;
		
	}
	friend void tranElemnt(ar_1 &,ar_2 &);	
	
	
};

void tranElemnt(ar_1 &a1,ar_2 &a2)//definition of friend
{
	int t[100],T;
	for(int i=0;i<(a2.n);i++)
	{
		t[i]=a2.a[i];
	}
	for(int i=0;i<(a1.n);i++)
	{
		a2.a[i]=a1.a[i];
	}
	for(int i=0;i<(a2.n);i++)
	{
		a1.a[i]=t[i];
	}
	T=(a2.n);
	(a2.n)=(a1.n);
	(a1.n)=T;
	cout << endl << "DATA HAS BEEN SWAPED ..."<< endl;
}

int main()
{
	ar_1 p;
	ar_2 q;
	//To fetch elements to array 
	p.getElemnt();
	q.getElemnt();
	//To display elements of array
	p.putElemnt();
	q.putElemnt();
	
	tranElemnt(p,q);//swaping of elements

	p.putElemnt();
	q.putElemnt();
	
	return 0;
}
/*
ARRAY 1
Enter number of Elements : 4

Enter 4 Elements :
1 4 7 8

ARRAY 2
Enter number of Elements : 6

Enter 6 Elements :
2 5 6 9 3 0


ARRAY 1
Present Elements :1     4       7       8

ARRAY 2
Present Elements :2     5       6       9       3       0

DATA HAS BEEN SWAPED ...

ARRAY 1
Present Elements :2     5       6       9       3       0

ARRAY 2
Present Elements :1     4       7       8

--------------------------------
Process exited after 30.84 seconds with return value 0
Press any key to continue . . .
/*