Program to find area of a circle

Area of a circle can simply be evaluated using following formula.

Area-of-circle

Area = pi * r2
where r is radius of circle 

C++

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// C++ program to find area
// of circle
#include <iostream>
const double pi = 3.14159265358979323846;
using namespace std;
  
// function to calculate the area of circle
float findArea(float r)
{
    return (pi * r * r);
}
// driver code
int main()
{
    float r, Area;
    r = 5;
  
    // function calling
    Area = findArea(r);
    // displaying the area
    cout << "Area of Circle is :" << Area;
    return 0;
}

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C

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// C program to find area
// of circle
#include <stdio.h>
#include <math.h>
#define PI 3.142
  
double findArea(int r)
{
   return PI * pow(r, 2);
}
  
int main()
{
    printf("Area is %f", findArea(5));
    return 0;
}

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Java

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// Java program to find area
// of circle
      
class Test
{
    static final double PI = Math.PI;
           
    static double findArea(int r)
    {
       return PI * Math.pow(r, 2);
    }
           
    // Driver method
    public static void main(String[] args) 
    {
        System.out.println("Area is " +  findArea(5));
    }
}

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Python3

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# Python3 program to find Area of a circle
  
def findArea(r):
    PI = 3.142
    return PI * (r*r);
  
# Driver method
print("Area is %.6f" % findArea(5));
  
# This code is contributed by Chinmoy Lenka

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C#

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// C# program to find area of circle
using System;
  
class GFG
{
    static double PI = Math.PI;
          
    static double findArea(int r)
    {
    return PI * Math.Pow(r, 2);
    }
          
    // Driver method
    static void Main() 
    {
        Console.Write("Area is " + findArea(5));
    }
}
  
// This code is contributed by Sam007.

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PHP

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<?php
// PHP program to find area
// of circle
       
function findArea( $r)
{
    $PI =3.142;
    return $PI * pow($r, 2);
}
   
// Driver Code
echo("Area is ");
echo(findArea(5));
return 0;
  
// This code is contributed by vt_m.
?>

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Output:

Area is 78.550000


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