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);
}
} // |
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
Time Complexity: O(1), since there is no loop or recursion.
Auxiliary Space: O(1), since no extra space has been taken.
This article is contributed by Saloni Gupta .