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Display a Filled and Hollow Rectangle in C#

This C# program demonstrates how to write two functions that display rectangles on the console screen. The first function, WriteRectangle, takes the width and height as parameters and displays a filled rectangle using asterisks. The second function, WriteHollowRectangle, displays only the border of the rectangle, leaving the inside empty. These functions can be useful for visualizing patterns or simple graphics in a console application.



Group

Functions in C#

Objective

1. Implement the WriteRectangle function to print a filled rectangle.
2. Use a loop to print rows and columns of asterisks based on the width and height parameters.
3. Implement the WriteHollowRectangle function to print only the border of the rectangle.
4. In WriteHollowRectangle, ensure the inside of the rectangle is empty, except for the border.
5. Test the functions with different sizes for both filled and hollow rectangles.

Write a C# function WriteRectangle to display a (filled) rectangle on the screen, with the width and height indicated as parameters, using asterisks. Complete the test program with a Main function.

Example C# Exercise

 Copy C# Code 
using System;

class Program
{
    // Function to display a filled rectangle with asterisks
    static void WriteRectangle(int width, int height)
    {
        // Loop through each row
        for (int i = 0; i < height; i++)
        {
            // Loop through each column in the row and print an asterisk
            for (int j = 0; j < width; j++)
            {
                Console.Write("*");
            }
            // Move to the next line after printing the row
            Console.WriteLine();
        }
    }

    // Function to display a hollow rectangle with asterisks on the border
    static void WriteHollowRectangle(int width, int height)
    {
        // Loop through each row
        for (int i = 0; i < height; i++)
        {
            // Loop through each column in the row
            for (int j = 0; j < width; j++)
            {
                // Print asterisk for the first and last rows or first and last columns
                if (i == 0 || i == height - 1 || j == 0 || j == width - 1)
                {
                    Console.Write("*");
                }
                else
                {
                    // Print space for the inside of the rectangle
                    Console.Write(" ");
                }
            }
            // Move to the next line after printing the row
            Console.WriteLine();
        }
    }

    static void Main()
    {
        // Test the WriteRectangle function with a width of 4 and height of 3
        Console.WriteLine("Filled Rectangle:");
        WriteRectangle(4, 3);
        
        // Test the WriteHollowRectangle function with a width of 3 and height of 4
        Console.WriteLine("\nHollow Rectangle:");
        WriteHollowRectangle(3, 4);
    }
}

 Output

Filled Rectangle:
****
****
****

Hollow Rectangle:
***
* *
* *
***

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