Banner C# Exercise - C# Programming Course

using System;  // Import the System namespace for basic functionality

class Program  // Define the main class
{
    static void Main()  // The entry point of the program
    {
        Console.Write("Enter the text to display in a banner: ");  // Prompt the user to input the text
        string input = Console.ReadLine();  // Read the input from the user

        // Call the method to display the banner with the input text
        DisplayBanner(input);
    }

    // Method to display a banner with the given text
    static void DisplayBanner(string text)
    {
        // Define the font for the banner using big letters
        string[] letters = new string[] 
        {
            "A B C D E F G H I J K L M N O P Q R S T U V W X Y Z",
            "A   A BBBBB  CCCCC D   D EEEEE FFFFF G   G H   H I   J K   K L     M   M N   N O   O P   P Q   Q R   R S   S T   T U   U V   V W   W X   X Y   Y Z   Z",
            "A   A B   B C     D   D E     F     G   G H   H I   J K   K L     MM MM NN NN OO OO PP PP QQ QQ RR RR S     T   T U   U V   V W   W X   X Y   Y Z",
            "AAAAA BBBBB  C     D   D EEEE  FFFFF GGGGG HHHHH I   J KKKK  L     M M M N   N O   O PPPP  Q  Q RRRR  SSSS  T   T U   U V   V W   W X   X Y   Y Z",
            "A   A B   B C     D   D E     F     G   G H   H I   J K   K L     M   M NN NN OO OO PP   P Q   Q RR RR S     T   T U   U V   V W   W X   X Y   Y Z",
            "A   A BBBBB  CCCCC DDDDD EEEEE F     G   G H   H I   J K   K LLLLL M   M N   N O   O P   P Q   Q R   R SSSS  T   T UUUU  V   V W   W X   X Y   Y Z   Z"
        };

        // Loop through each row in the big letters to create the banner
        for (int i = 0; i < 6; i++)  // We have 6 lines for the letters
        {
            foreach (char c in text.ToUpper())  // Iterate through each character in the input text (convert to uppercase)
            {
                if (c == ' ')  // If the character is a space, just print a space in the banner
                {
                    Console.Write("     ");  // Adjust space size for proper alignment
                }
                else if (c >= 'A' && c <= 'Z')  // Check if the character is a valid letter (A-Z)
                {
                    // Calculate the position of the character in the alphabet (0-25)
                    int charIndex = c - 'A';

                    // Calculate the starting index for the letter in the string (each letter is 6 characters long)
                    int startIndex = charIndex * 6;

                    // Check if the startIndex is within bounds of the current row string
                    if (startIndex + 6 <= letters[i].Length)
                    {
                        // Print the corresponding row of the letter in the banner
                        Console.Write(letters[i].Substring(startIndex, 6));  // Use length 6 to include the space
                    }
                }
                else
                {
                    // If the character is invalid (not A-Z), just print spaces
                    Console.Write("      ");
                }
            }
            Console.WriteLine();  // Move to the next line in the banner
        }
    }
}