PRA_15

/* A program to demonstrate use of friend function */

#include<iostream>

using namespace std;

class Area //defining class
{
	int r;// data member 
	public:
		friend float cirArea(Area);// friend function declaration
		void getRadius() //method to fetch radius
		{
			cout << "Enter Radius : ";
			cin >> r;
		}
		void putArea(float a)//method to display area
		{
			cout << "Circle area = "<< a;
		}
};
float cirArea(Area a) // defining friend function to calculate area
{
	return (3.14)*(a.r)*(a.r);	 	
}
int main()
{
	Area c;
	float A;

	c.getRadius();
	A=cirArea(c);
	c.putArea(A);
	
	return 0;
}
/*
Output :
Enter Radius : 8
Circle area = 200.96
--------------------------------
Process exited after 5.263 seconds with return value 0
Press any key to continue . . .
/*