/*
  Module: tr2_q3.cpp
  Author: Yariv Amar

  What?
  This program calculates S and P for any given radius of a circle.
  Input : Radius of circle
  Output: P & S of the circle
  Assumptions on input: Non negativ number.

  How?
  Algorithm : trivial
  P=2*PI*R
  S=PI*R*R
*/

# include <iostream.h>

void main()
{
	const double PI=3.141592654; //define PI as a constant variable
	double  Radius ;

	cout << "Please enter the radius of the circle :";
	cin >> Radius;	// Get radius from the user
	cout <<"=======================================\n";
	// The next 2 lines will calculate and print S & P
	cout <<"The S  (area)  of the circle is: "<<PI*Radius*Radius<<"\n";
	cout <<"The P (length) of the circle is: "<<2*PI*Radius<<"\n"; 
}

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