C# Program to Display Letters from A to Z

C# programs to display uppercase letters from A to Z or lowercase letters from a to z have been shown here. Both the iterative and recursive approaches have been covered.

Page content(s):

1. Program & Output

 1.1. Iterative approach

 1.2. Recursive approach

1. C# program & output to Display Characters from A to Z

1.1. C# program & output to Display Characters from A to Z using Iteration

Code has been copied

/*************************************
	alphabetacoder.com
C# Program to display characters 
from A to Z or a to z using iteration
**************************************/

using System;

namespace DisplayAtoZ {
    class Program {
        static void Main(string[] args) {
            // declare variables
            int i, s;

            // take input
            Console.WriteLine("Enter 1 to display A to Z");
            Console.WriteLine("Enter 2 to display a to z");
            Console.Write("Your choice >> ");
            s = Convert.ToInt32(Console.ReadLine());

            // display result
            if (s == 1) {
                // display uppercase letters
                for (i = 'A'; i <= 'Z'; i++) {
                    Console.Write((char) i + " ");
                }
            } else if (s == 2) {
                // display lowercase letters
                for (i = 'a'; i <= 'z'; i++) {
                    Console.Write((char) i + " ");
                }
            } else
                Console.Write("Wrong choice!");;

            // new line
            Console.WriteLine("");

            // wait for the user to press any key
            Console.ReadKey();
        }
    }
}

Output

Case 1:

Enter 1 to display A to Z

Enter 2 to display a to z

Your choice >> 1

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

Case 2:

Enter 1 to display A to Z

Enter 2 to display a to z

Your choice >> 2

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

Case 3:

Enter 1 to display A to Z

Enter 2 to display a to z

Your choice >> 3

Wrong choice!

1.2. C# program & output to Display Characters from A to Z using Recursion

Code has been copied

/************************************
	  alphabetacoder.com
C# Program to display characters 
from A to Z or a to z using recursion
*************************************/

using System;

namespace DisplayAtoZ {
    class Program {
        // recursive function to print A to Z
        static void print_uppercase(char i, char j) {
            // display current character
            Console.Write(i + " ");

            // exit condition
            if (i == j)
                return;
            // call function
            print_uppercase(++i, j);
        }

        // recursive function to print a to z
        static void print_lowercase(char i, char j) {
            // display current character
            Console.Write(i + " ");

            // exit condition
            if (i == j)
                return;
            // call function
            print_lowercase(++i, j);
        }

        static void Main(string[] args) {
            // declare variables
            int s;

            // take input
            Console.WriteLine("Enter 1 to display A to Z");
            Console.WriteLine("Enter 2 to display a to z");
            Console.Write("Your choice >> ");
            s = Convert.ToInt32(Console.ReadLine());

            // display result
            if (s == 1) {
                // display uppercase letters
                // by calling recursive function
                print_uppercase('A', 'Z');

            } else if (s == 2) {
                // display lowercase letters
                // by calling recursive function
                print_lowercase('a', 'z');
            } else
                Console.Write("Wrong choice!");;

            // new line
            Console.WriteLine("");

            // wait for the user to press any key
            Console.ReadKey();
        }
    }
}

Output

Case 1:

Enter 1 to display A to Z

Enter 2 to display a to z

Your choice >> 1

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

Case 2:

Enter 1 to display A to Z

Enter 2 to display a to z

Your choice >> 2

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

Case 3:

Enter 1 to display A to Z

Enter 2 to display a to z

Your choice >> 0

Wrong choice!