Program to print solid and hollow square patterns

06 Jun, 2022
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++
Java
Python3
C#
PHP
Javascript
// C++ program to print// hollow and solid square patterns #include <bits/stdc++.h>using namespace std; // Function for hollow squarevoid 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 squarevoid 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 patternsvoid printPattern(int rows){    cout << "\nSolid Square:\n";    solidSquare(rows);         cout << "\nHollow Square:\n";    hollowSquare(rows);} // Driver programint main(){    int rows = 5;    printPattern (rows);    return 0;}
// 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 program to print# hollow and solid square patterns # Function for hollow squaredef 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 squaredef 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 patternsdef printPattern(rows):     print("Solid Square:")    solidSquare(rows)         print("\nHollow Square:")    hollowSquare(rows) # Driver Coderows = 5printPattern (rows) # This code is contributed by# Mohit kumar 29
// C# program to print// hollow and solid square patternsusing 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 program to print hollow// and solid square patterns // Function for hollow squarefunction 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 == $rows)                    echo "*";                else                    echo " ";         // Move to the next line/row        echo "\n";    }} // Function for Solid squarefunction solidSquare($rows){    for ($i = 1; $i <= $rows; $i++)    {        // Print stars after spaces        for ($j = 1; $j <= $rows; $j++)            echo "*";         // Move to the next line/row        echo "\n";    } } // Utility program to// print all patternsfunction printPattern($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?>
<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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