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

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