# Program to print Square inside a Square

Given a number N, print a hollow square of side with N asterisks(‘*’), and inside it print a hollow square of side N-4 asterisks(‘*’).

Examples :

```Input : 6
Output :
******
*    *
* ** *
* ** *
*    *
******

Input :9
Output :
*********
*       *
* ***** *
* *   * *
* *   * *
* *   * *
* ***** *
*       *
*********
```

## Recommended: Please try your approach on {IDE} first, before moving on to the solution.

The idea is to run two nested loops from 1 to n for rows and columns and now to check for conditions when to print an asterisk(‘*’) and when to print space(‘ ‘). The condition for printing asterisks will be:

```// This will print asterisks on the boundary
(i == 1 || i == n || j == 1 || j == n)

// This will print the asterisks on the boundary
// of inner square
(i >= 3 && i = 3 && j <= n - 2) &&
(i == 3 || i == n - 2 || j == 3 || j == n - 2))
```

All of the indexes which do not satisfy the above condition will contain space.

Below is the implementation of above idea:

## C

 `// C program to print square inside ` `// a square pattern ` `#include ` ` `  `// Function to print the pattern square  ` `// inside a square ` `void` `printPattern(``int` `n)  ` `{ ` `    ``int` `i, j; ` `     `  `    ``// To access rows of the square ` `    ``for` `(i = 1; i <= n; i++)  ` `    ``{ ` `        ``// To access columns of the square ` `        ``for` `(j = 1; j <= n; j++) ` `        ``{ ` `     `  `            ``// For printing the required square pattern  ` `            ``if` `((i == 1 || i == n || j == 1 || j == n) || ` `                ``(i >= 3 && i <= n - 2 && j >= 3 && j <= n - 2) && ` `                 ``(i == 3 || i == n - 2 || j == 3 || j == n - 2)) ` `            ``{ ` `                ``// Prints star(*) ` `                ``printf``(``"*"``);  ` `            ``}  ` `            ``else` `            ``{ ` `                ``// Prints space(" ") ` `                ``printf``(``" "``);  ` `            ``} ` `        ``} ` `     `  `        ``printf``(``"\n"``); ` `    ``} ` `} ` ` `  `// Driver Code ` `int` `main()  ` `{ ` `    ``int` `n = 7;  ` `    ``printPattern(n);  ` `    ``return` `0; ` `} `

## Java

 `// Java program to print square inside ` `// a square pattern ` `import` `java.lang.*; ` ` `  `class` `GFG { ` `     `  `// Function to print the pattern square ` `// inside a square ` `static` `void` `printPattern(``int` `n) { ` ` `  `    ``// To access rows of the square ` `    ``for` `(``int` `i = ``1``; i <= n; i++) { ` `         `  `    ``// To access columns of the square ` `    ``for` `(``int` `j = ``1``; j <= n; j++) { ` ` `  `        ``/*** For printing the required square pattern ***/` `        ``if` `((i == ``1` `|| i == n || j == ``1` `|| j == n) || ` `            ``(i >= ``3` `&& i <= n - ``2` `&& j >= ``3` `&& j <= n - ``2``) && ` `                ``(i == ``3` `|| i == n - ``2` `|| j == ``3` `|| j == n - ``2``))  ` `        ``{ ` `        ``// Prints star(*)             ` `        ``System.out.print(``"*"``);  ` `        ``}  ` `        ``else` `        ``{ ` `        ``// Prints space(" ")     ` `        ``System.out.print(``" "``);  ` `        ``} ` `    ``} ` ` `  `    ``System.out.print(``"\n"``); ` `    ``} ` `} ` ` `  `// Driver code ` `public` `static` `void` `main(String[] args) { ` `    ``int` `n = ``7``; ` `    ``printPattern(n); ` `} ` `} ` ` `  `// This code is contributed by Anant Agarwal. `

## Python3

 `# Python program to ` `# print square inside ` `# a square pattern ` ` `  `# Function to print ` `# the pattern square  ` `# inside a square ` `def` `printPattern(n): ` `     `  `    ``# To access rows of the square ` `    ``for` `i ``in` `range``(``1``,n``+``1``):  ` `     `  `        ``# To access columns of the square ` `        ``for` `j ``in` `range``(``1``,n``+``1``): ` `         `  `            ``# For printing the required square pattern  ` `            ``if` `((i ``=``=` `1` `or` `i ``=``=` `n ``or` `j ``=``=` `1` `or` `j ``=``=` `n) ``or` `                ``(i >``=` `3` `and` `i <``=` `n ``-` `2` `and` `j >``=` `3` `and` `j <``=` `n ``-` `2``) ``and` `                    ``(i ``=``=` `3` `or` `i ``=``=` `n ``-` `2` `or` `j ``=``=` `3` `or` `j ``=``=` `n ``-` `2``)): ` `             `  `                ``print``(``"*"``,end``=``"") ``# Prints star(*) ` `             `  `            ``else``: ` `             `  `                ``print``(``" "``,end``=``"``") # Prints space("` `") ` `             `  `        ``print``() ` `         `  ` `  `# Driver code ` ` `  `n ``=` `7`    `printPattern(n) ` ` `  `# This code is contributed ` `# by Anant Agarwal. `

## C#

 `// C# program to print square inside ` `// a square pattern ` `using` `System; ` ` `  `class` `GFG { ` `     `  `    ``// Function to print the pattern square ` `    ``// inside a square ` `    ``static` `void` `printPattern(``int` `n) { ` `     `  `        ``// To access rows of the square ` `        ``for` `(``int` `i = 1; i <= n; i++) { ` `             `  `            ``// To access columns of the square ` `            ``for` `(``int` `j = 1; j <= n; j++) { ` `         `  `                ``/*** For printing the required  ` `                     ``square pattern ***/` `                ``if` `((i == 1 || i == n || j == 1  ` `                       ``|| j == n) || (i >= 3 &&  ` `                        ``i <= n - 2 && j >= 3 &&  ` `                      ``j <= n - 2) && (i == 3 ||  ` `                        ``i == n - 2 || j == 3 || ` `                                   ``j == n - 2))  ` `                ``{ ` `                     `  `                    ``// Prints star(*)      ` `                    ``Console.Write(``"*"``);  ` `                ``}  ` `                ``else` `                ``{ ` `                     `  `                    ``// Prints space(" ")  ` `                    ``Console.Write(``" "``);  ` `                ``} ` `            ``} ` `         `  `            ``Console.WriteLine(); ` `        ``} ` `    ``} ` `     `  `    ``// Driver code ` `    ``public` `static` `void` `Main() { ` `         `  `        ``int` `n = 7; ` `         `  `        ``printPattern(n); ` `    ``} ` `} ` ` `  `// This code is contributed by vt_m. `

## PHP

 `= 3 && ``\$i` `<= ``\$n` `- 2 &&  ` `                ``\$j` `>= 3 && ``\$j` `<= ``\$n` `- 2) && ` `                ``(``\$i` `== 3 || ``\$i` `== ``\$n` `- 2 || ` `                ``\$j` `== 3 || ``\$j` `== ``\$n` `- 2)) ` `            ``{ ` `                ``// Prints star(*) ` `                ``echo` `"*"``;  ` `            ``}  ` `            ``else` `            ``{ ` `                ``// Prints space " " ` `                ``echo` `" "``;  ` `            ``} ` `        ``} ` `     `  `        ``echo``"\n"``; ` `    ``} ` `} ` ` `  `// Driver Code ` `\$n` `= 7;  ` `printPattern(``\$n``); ` ` `  `// This code is contributed by Mithun Kumar ` `?> `

Output :

```*******
*     *
* *** *
* * * *
* *** *
*     *
*******
```

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Improved By : Mithun Kumar