C#: Check whether a character is an alphabet or not and if so, check for the case

Last update on August 25 2025 12:50:38 (UTC/GMT +8 hours)

Write a C# Sharp program to check whether a character is an alphabet and not and if so, check for the case.

Sample Solution:-

C# Sharp Code:

using System;

// Define the Exercise18 class
public class Exercise18
{
    // Main method - entry point of the program
    static void Main()
    {
        // Prompt the user to check whether a character is an alphabet or not
        Console.Write("\n\nCheck whether a character is alphabet or not and if so, check for case :\n");
        Console.Write("-----------------------------------------------------------------------------\n");

        // Prompt the user to input a character
        Console.Write("Input a character: ");

        // Read a single character from the console input
        char ch = (char)Console.Read();

        // Check if the entered character is an alphabet
        if (Char.IsLetter(ch))
        {
            // Check if the alphabet is uppercase
            if (Char.IsUpper(ch))
            {
                // Display a message indicating the character is uppercase
                Console.WriteLine("\nThe character is uppercase.\n");
            }
            else
            {
                // Display a message indicating the character is lowercase
                Console.WriteLine("\nThe character is lowercase.\n");
            }
        }
        else
        {
            // Display a message indicating that the entered character is not an alphabet
            Console.WriteLine("\nThe entered character is not an alphabetic character.\n");
        }
    }
}

Sample Output:

Check whether a character is alphabet or not and if so, check for case :                                      
-----------------------------------------------------------------------------                                 
Input a character: a                                                                                          
The character is lowercase.

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