Program to print solid and hollow square patterns

For any given number n, print Hollow and solid Squares and Rhombus made with stars(*).
Examples:

Input : n = 4
Output : 

Solid Square:
****
****
****
****

Hollow Square:
****
*  *
*  *
****

1. Solid Square : Solid Square is easiest among all given patterns. To print Solid square with n rows, we should use two loops iterating n times both. Where the outer loop is used for numbers of rows and the inner loop is used for printing all stars in a particular row.
2. Hollow Square : Hollow Square requires a little bit improvisation. Here we should again use two loops, where 1st and last row must have all n-stars and remaining rows have stars only in 1st and last column. 

C++

// C++ program to print
// hollow and solid square patterns

#include <bits/stdc++.h>
using namespace std;

// Function for hollow square
void hollowSquare(int rows)
{
    int i, j;
    for (i=1; i<=rows; i++)
    {
        // Print stars for each solid rows
        if (i==1 || i==rows)
            for (j=1; j<=rows; j++)
                cout << "*";

        // stars for hollow rows
        else
            for (j=1; j<=rows; j++)
                if (j==1 || j==rows)
                    cout << "*";
                else
                    cout << " ";

        // Move to the next line/row
        cout << "\n";
    }
}

// Function for Solid square
void solidSquare(int rows)
{
    int i, j;
    for (i=1; i<=rows; i++)
    {
        // Print stars after spaces
        for (j=1; j<=rows; j++)
            cout << "*";

        // Move to the next line/row
        cout << "\n";
    }

}

// Utility program to print all patterns
void printPattern(int rows)
{
    cout << "\nSolid Square:\n";
    solidSquare(rows);

    cout << "\nHollow Square:\n";
    hollowSquare(rows);
}

// Driver program
int main()
{
    int rows = 5;
    printPattern (rows);
    return 0;
}

Java

// Java program to print
// hollow and solid square patterns

class GFG
{
    // Function for hollow square
    static void hollowSquare(int rows)
    {
        int i, j;
        for (i = 1; i <= rows; i++)
        {
            // Print stars for each solid rows
            if (i == 1 || i == rows)
                for (j = 1; j <= rows; j++)
                    System.out.print("*");

            // stars for hollow rows
            else
                for (j = 1; j <= rows; j++)
                    if (j == 1 || j == rows)
                        System.out.print("*");
                    else
                        System.out.print(" ");

            // Move to the next line/row
            System.out.print("\n");
        }
    }

    // Function for Solid square
    static void solidSquare(int rows)
    {
        int i, j;
        for (i = 1; i <= rows; i++)
        {
            // Print stars after spaces
            for (j = 1; j <= rows; j++)
                System.out.print("*");

            // Move to the next line/row
            System.out.print("\n");
        }

    }

    // Utility program to print all patterns
    static void printPattern(int rows)
    {
        System.out.print("\nSolid Square:\n");
        solidSquare(rows);

        System.out.print("\nHollow Square:\n");
        hollowSquare(rows);
    }

    // Driver program
    public static void main (String[] args)
    {
        int rows = 5;
        printPattern (rows);
    }
}

// This code is contributed by Anant Agarwal.

Python3

# Python3 program to print
# hollow and solid square patterns

# Function for hollow square
def hollowSquare(rows):

    for i in range(1, rows + 1):

        # Print stars for each solid rows
        if (i == 1 or i == rows):
            for j in range(1, rows + 1):
                print("*", end = "")

        # stars for hollow rows
        else:
            for j in range(1, rows + 1):
                if (j == 1 or j == rows):
                    print("*", end = "")
                else:
                    print(end = " ")

        # Move to the next line/row
        print()

# Function for Solid square
def solidSquare(rows):

    for i in range(1, rows):

        # Print stars after spaces
        for j in range(1, rows + 1):
            print("*", end = "")

        # Move to the next line/row
        print()

# Utility program to print all patterns
def printPattern(rows):

    print("Solid Square:")
    solidSquare(rows)

    print("\nHollow Square:")
    hollowSquare(rows)

# Driver Code
rows = 5
printPattern (rows)

# This code is contributed by
# Mohit kumar 29

C#

// C# program to print
// hollow and solid square patterns
using System;

class GFG
{
    // Function for hollow square
    static void hollowSquare(int rows)
    {
        int i, j;
        for (i = 1; i <= rows; i++)
        {
            // Print stars for each solid rows
            if (i == 1 || i == rows)
                for (j = 1; j <= rows; j++)
                    Console.Write("*");

            // stars for hollow rows
            else
                for (j = 1; j <= rows; j++)
                    if (j == 1 || j == rows)
                        Console.Write("*");
                    else
                        Console.Write(" ");

            // Move to the next line/row
            Console.WriteLine();
        }
    }

    // Function for Solid square
    static void solidSquare(int rows)
    {
        int i, j;
        for (i = 1; i <= rows; i++)
        {
            // Print stars after spaces
            for (j = 1; j <= rows; j++)
                Console.Write("*");

            // Move to the next line/row
            Console.WriteLine();
        }

    }

    // Utility program to print all patterns
    static void printPattern(int rows)
    {
        Console.Write("\nSolid Square:\n");
        solidSquare(rows);

        Console.Write("\nHollow Square:\n");
        hollowSquare(rows);
    }

    // Driver program
    public static void Main ()
    {
        int rows = 5;
        printPattern (rows);
    }
}

// This code is contributed by vt_m.

PHP

<?php
// php program to print hollow
// and solid square patterns

// Function for hollow square
function hollowSquare($rows)
{
    for ($i = 1; $i <= $rows; $i++)
    {

        // Print stars for each solid rows
        if ($i == 1 || $i == $rows)
            for ($j = 1; $j <= $rows; $j++)
                echo "*";

        // stars for hollow rows
        else
            for ($j = 1; $j <= $rows; $j++)
                if ($j == 1 || $j == $rows)
                    echo "*";
                else
                    echo " ";

        // Move to the next line/row
        echo "\n";
    }
}

// Function for Solid square
function solidSquare($rows)
{
    for ($i = 1; $i <= $rows; $i++)
    {
        // Print stars after spaces
        for ($j = 1; $j <= $rows; $j++)
            echo "*";

        // Move to the next line/row
        echo "\n";
    }

}

// Utility program to
// print all patterns
function printPattern($rows)
{
    echo "\nSolid Square:\n";
    solidSquare($rows);

    echo "\nHollow Square:\n";
    hollowSquare($rows);
}

    // Driver code
    $rows = 5;
    printPattern ($rows);

// This code is contributed by mits
?>

Javascript

<script>

      // JavaScript program to print
      // hollow and solid square patterns

      // Function for hollow square
      function hollowSquare(rows) {
        var i, j;
        for (i = 1; i <= rows; i++) {
          // Print stars for each solid rows
          if (i == 1 || i == rows)
            for (j = 1; j <= rows; j++) document.write("*");

          // stars for hollow rows
          else
            for (j = 1; j <= rows; j++)
              if (j == 1 || j == rows) document.write("*");
              else document.write("  ");

          // Move to the next line/row
          document.write("<br>");
        }
      }

      // Function for Solid square
      function solidSquare(rows) {
        var i, j;
        for (i = 1; i <= rows; i++) {
          // Print stars after spaces
          for (j = 1; j <= rows; j++) document.write("*");

          // Move to the next line/row
          document.write("<br>");
        }
      }

      // Utility program to print all patterns
      function printPattern(rows) {
        document.write("Solid Square:<br>");
        solidSquare(rows);

        document.write("<br>Hollow Square:<br>");

        hollowSquare(rows);
      }

      // Driver program
      var rows = 5;
      printPattern(rows);

</script>

Output : 

Solid Square:
*****
*****
*****
*****
*****

Hollow Square:
*****
*   *
*   *
*   *
*****

Time Complexity: O(n²), where n represents the given input.
Auxiliary Space: O(1), no extra space is required, so it is a constant.

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