## Exercise 14: Calculating A Circle's Diameter, Circumference And Area

Date completed: 13/09/2017

Write a program that reads the radius of a circle (as a double value) and computes and prints the diameter, the circumference and the area. Use the value 3.14159 for Π.

### The Code: Circle.cpp

```                ```
/*
* Circle.cpp
*
*/

/*
* (Calculating a Circle‘s Diameter, Circumference and Area) Write a program that reads the
* radius of a circle (as a double value) and computes and prints the diameter, the
* circumference and the area. Use the value 3.14159 for pi.
*
* The following formulas are used:
* diameter = 2r
* circumference = 2*pi*r
* area = pi*r*2
*
*/

#include <iostream>     // Allows program to output data to the screen.

using namespace std;

// The function main() begins program execution.
int main() {

// Variable declarations
double PI = 3.14159;

cout << "Enter the radius: ";	// prompt the user for the first integer

// Calculation and output of the variables
cout << "\n" <<  "The diameter of the circle  is "
<< 2*radius << "\n" << endl;
cout << "The circumference of the circle  is "
<< 2*PI*radius << "\n" << endl;
cout << "The diameter of the circle  is "