Question

Write Java program that asks a user to input a letter, converts the user input to uppercase if the user types the letter in lowercase, and based on the letter the user the user enters, display a message showing the number that matches the letter entered.

For letters A or B or C display 2

For letter D or E or F display 3

For letter G or H or I display 4

For letter J or K or L display 5

For letter M or N or O display 6

For letter P or Q or R or S display 7

For letter T or U or V display 8

For W or X or Y or Z display 9

Use a switch statement in this program

Sample input and output would be user entering a small letter a and the output being:

"The letter you entered was A"

"The number associated with the letter you entered is 2"

Another example of input and output would be the used entering a small m and the output being:

"The letter you entered was M"

The number associated with the letter you entered is 6"

Answer 1

The below code gives the result as oer the requirement given in the question.

The code has been well commented to understand the logic.

Code:

import java.util.*;
public class Main {
    public static void main(String args[]) {
      String letter;
                System.out.println("Enter a letter: ");
                
                Scanner sc = new Scanner(System.in);  // craete a Scanner class object to take input from user
                letter = sc.nextLine();  // store the input in the variable
                System.out.println("The letter you entered was "+ letter.toUpperCase() );  // string.toUpperCase() to convert into upper case
                
                switch(letter.toLowerCase() ){  // the switch statement to generate the number associated with the letter
                    case "a":  // multiple condition same result type of case statement
                    case "b":
                    case "c":
                        System.out.println("The number associated with the letter you entered is 2" ); // print statement for each case to generate the associated number
                        break;
                    case "d":
                    case "e":
                    case "f":
                        System.out.println("The number associated with the letter you entered is 3" );
                        break;
                    case "g":
                    case "h":
                    case "i":
                        System.out.println("The number associated with the letter you entered is 4" );
                        break;
                    case "j":
                    case "k":
                    case "l":
                        System.out.println("The number associated with the letter you entered is 5" );
                        break;
                    case "m":
                    case "n":
                    case "o":
                        System.out.println("The number associated with the letter you entered is 6" );
                        break;
                    case "p":
                    case "q":
                    case "r":
                    case "s":
                        System.out.println("The number associated with the letter you entered is 7" );
                        break;
                    case "t":
                    case "u":
                    case "v":
                        System.out.println("The number associated with the letter you entered is 8" );
                        break;
                    case "w":
                    case "x":
                    case "y":
                    case "z":
                        System.out.println("The number associated with the letter you entered is 9" );
                        break;
                }
    }
}

Output Screenshot :