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; ` `} ` |

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## 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. ` |

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## 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. ` |

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## 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. ` |

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## 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. ` `?> ` |

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Output:

16

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