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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Improved By : jit_t, vt_m