Question

hello. i need help with number 2 ONLY

1. Use if statements to write a Java program that inputs a single letter and prints out the corresponding digit on the telephone. The letters and digits on a telephone are grouped this way 2=ABC 3 = DEF 4 GHI 5 JKL 6 - MNO 7 - PRS 8 - TUV 9-WXY No digit corresponds to either Qor Z. For these 2 letters your program should print a message indicating that they are not sed on a telephone. The program may operate like this (sample output): Enter a single letter and you will get the corresponding digit on the telephone: R The digit 7 corresponds to the letter R on the telephone Another sample: Enter a single letter and you will get the corresponding digit on the telephone: Z There is no digit on the telephone that corresponds to Z NOTE: Your program should accept only uppercase letters (error message for special characters or lowercase letters) 2. Rewrite the program - this time use a switch statement 3. Write a program to assign a letter grade according to the following scheme: A: total score >= 90 B: 80 total score <90 C: 70 total score < 80 D: 60 total score < 70 F: total score <60 Output - the student's total score (float, 2 decimals) and letter grade Testing - test your program with the following input data: testi -95; test2 = 80; final - 90: assignments - 80 The expected output is: score - 86.25 and letter grade-B.

Answer 1

/*
* The java program that prompts user to enter the letter
* from the console and then using switch case to find the digit corresponding to
* on the telephone and then display the digit corresponding to the letter
* and otherwise print an error message indicating that there
* is not digit corresponding to letter.
* */
//Exercise_2.java
import java.util.Scanner;
public class Exercise_2
{
   public static void main(String[] args)
   {
       //Create a Scanner class object to read input from console
       Scanner kboard=new Scanner(System.in);
       char letter;
       int digit = 0;
       //read letter from console
       System.out.print("Enter a single letter and you will get the corresponding digit on the telephone: ");
       letter=kboard.nextLine().charAt(0);
       /*Switch case to match the case label for letter*/
       switch(letter)
       {
       case 'Q':
       case 'Z':
           //set digit to -1 for Q and Z letters
           digit=-1;
           break;
          
       case 'A':
       case 'B':
       case 'C':
           digit=2;
           break;
          
       case 'D':
       case 'E':
       case 'F':
           digit=3;
           break;
          
       case 'G':
       case 'H':
       case 'I':
           digit=4;
           break;
          
       case 'J':
       case 'K':
       case 'L':
           digit=5;
           break;
       case 'M':
       case 'N':
       case 'O':
           digit=6;
           break;
          
       case 'P':
       case 'R':
       case 'S':
           digit=7;
           break;
          
       case 'T':
       case 'U':
       case 'V':
           digit=8;
           break;
          
       case 'W':
       case 'X':
       case 'Y':
           digit=9;
           break;

       }
       /*Check if digit is -1 the print the error message*/
       if(digit==-1)
           System.out.println("There is no digit on the telephone that corresponds to "+letter);
       else
           //Otherwise print the letter corresponding to the digit
           System.out.println("The digit "+digit+" corresponds to the letter "+letter+" on the telephone.");

   }

}
----------------------------------------------Sample Output------------------------------------------------------

Run#1

Enter a single letter and you will get the corresponding digit on the telephone: Z There is no digit on the telephone that corresponds to Z

Run#2

Enter a single letter and you will get the corresponding digit on the telephone: R the digit 7 corresponds to the letter R on the telephone.