Program to find Circumference of a Circle

Given radius of a circle, write a program to find its circumference.

Examples :

Input : 2
Output : Circumference = 12.566

Input : 8
Output : Circumference = 50.264

In a circle, points lie in the boundary of a circle are at same distance from its center. This distance is called radius. Circumference of a circle can simply be evaluated using following formula.

Circumference = 2*pi*r
where r is the radius of circle 
and value of pi = 3.1415.



C++

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// CPP program to find circumference of circle
#include<bits/stdc++.h>
using namespace std;
  
#define PI 3.1415
  
double circumference(double r)
{
    double cir = 2*PI*r;
    return cir;
}
  
// driver function
int main()
{
  double r = 5;
  cout << "Circumference = " 
       << circumference(r);
  return 0;
} 

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Python3














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# Python3 code to find  


# circumference of circle 


  


PI = 3.1415


  


# utility function 


def circumference(r): 


    return (2 * PI * r) 


  


  


# driver function 


print ('%.3f' % circumference(5)) 


  


# This code is contributed by Saloni Gupta 



















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Java














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// Java program to find circumference of circle 


import java.io.*; 


  


class Geometry { 


      


    // utility function 


    static double circumference(double r){ 


  


        double PI = 3.1415; 


        double cir = 2*PI*r; 


        return cir; 


    } 


      


    // driver function 


    public static void main (String[] args) { 


  


        double r = 5; 


        double result = Math.round(circumference(r) * 1000) / 1000.0; 


        System.out.println("Circumference = "+ result); 


    } 


} 


  


// This article is contributed by Chinmoy Lenka 



















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C#














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// C# program to find circumference of circle 


using System; 


  


class GFG { 


      


    // utility function 


    static double circumference(double r){ 


  


        double PI = 3.1415; 


        double cir = 2*PI*r; 


        return cir; 


    } 


      


    // driver function 


    public static void Main () { 


  


        double r = 5; 


        double result = 


              Math.Round(circumference(r) 


                        * 1000) / 1000.0; 


                          


        Console.WriteLine("Circumference = "


                                  + result); 


    } 


} 


  


// This article is contributed by anuj_67. 



















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PHP














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<?php 


// PHP program to find  


// circumference of circle 


  


$PI= 3.1415; 


  


function circumference($r) 


{ 


    global $PI; 


    $cir = 2 * $PI * $r; 


    return $cir; 


} 


  


// Driver Code 


$r = 5; 


echo "Circumference = ", 


circumference($r); 


  


// This code is contributed aj_36 


?> 



















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Output :


Circumference = 31.415



This article is contributed by Saloni Gupta . If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.


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