Program to find the area of a Square

What is a square ? 
Square is a flat shape, in one plane, defined by four points at the four corners. A square has four sides all of equal length, and four corners, all right angles (90 degree angles). A square is a kind of rectangle but with all sides equal. 

Formula :

Examples: 

Input : 4
Output :16

Input :8
Output :64

CPP

// CPP program to find the area of a square
#include <iostream>
using namespace std;

// function to find the area
int area_fun(int side)
{
int area = side * side;
return area;
}

// Driver program
int main()
{
int side = 4;
int area = area_fun(side);
cout << area;
return 0;
}

Java

// Java program to find
// the area of a square

class GFG
{

// function to find the area
static int area_fun(int side)
{
int area = side * side;
return area;
}

// Driver code
public static void main(String arg[])
{
    int side = 4;
    int area = area_fun(side);
    System.out.println(area);
}
}

// This code is contributed
// by Anant Agarwal.

Python3

# Python program to find
# the area of a square

# function to find the area
def area_fun(side):
    area = side * side
    return area

# Driver program
side = 4
area = area_fun(side)
print (area)

# This Code is Contributed
# by Azkia Anam.

C#

// C# program to find
// the area of a square
using System;

class GFG {

    // function to find the area
    static int area_fun(int side)
    {
        int area = side * side;
        return area;
    }

    // Driver code
    public static void Main()
    {
        int side = 4;
        int area = area_fun(side);
        Console.WriteLine(area);
    }
}

// This code is contributed by vt_m.

PHP

<?php
// PHP program to find the
// area of a square

// function to find the area
function area_fun($side)
{
    $area = $side * $side;
    return $area;
}

// Driver program
$side = 4;
$area = area_fun($side);
echo( $area);

// This code is contributed
// by vt_m.
?>

Javascript

<script>

// Javascript program to find the area of a square

// function to find the area
function area_fun(side)
{
  let area = side * side;
  return area;
}

// Driver program
let side = 4;
let area = area_fun(side);
document.write(area);

// This code is contributed by Mayank Tyagi
</script>

Output: 

16

Time complexity: O(1)

space complexity: O(1)

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