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 3.1415double circumference(double r){ double cir = 2*PI*r; return cir;}// driver functionint main(){ double r = 5; cout << "Circumference = " << circumference(r); return 0;} |
Java
// Java program to find circumference of circleimport 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 circlePI = 3.1415# utility functiondef circumference(r): return (2 * PI * r)# driver functionprint ('%.3f' % circumference(5))# This code is contributed by Saloni Gupta |
C#
// C# program to find circumference of circleusing 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 circlefunction 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.
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