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Program to find Circumference of a Circle
  • Difficulty Level : Hard
  • Last Updated : 24 Mar, 2021

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++




// 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;
}

Java




// 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

Python3




# 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

C#




// 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.

PHP




<?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
?>

Javascript




<script>
 
// Javascript program to find circumference of circle
 
function circumference(r)
{
    let cir = 2*3.1415*r;
    return cir;
}
 
// driver function
  
let r = 5;
document.write("Circumference = "
    + circumference(r));
 
//This code is contributed by Manoj
 
</script>

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.
Please write comments if you find anything incorrect, or you want to share more information about the topic discussed above.
 

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