Question

To make telephone numbers easier to remember, some companies use letters to show their telephone number. For example, using letters, the telephone number 438-5626 can be shown as GET LOAN. In some cases, to make a telephone number meaningful, companies must see more than seven letters. For example, 255-5466 can be displayed as CALL HOME, which uses eight letters.

Write a program that prompts the user to enter a telephone expressed in letters and outputs the corresponding telephone number in digits. If the user enters more than seven letters, then process only the first seven letters. Also output the - (hyphen) after the third digit. Allow the user to use both uppercase and lowercase letters as well as spaces between words.

* Java program free from syntax, logic and run time errors

* Used appropriate String and Character methods to handle blank spaces, digits, letters and others.

* Code optimisation: no unnecessary variables, if statements and counters.

* Shown with 3 Cases (at least one with blank spaces etc.). Descriptive block and inline comments included

Answer 1

Answer:--                                                                   Date:--27/02/2019

FILE NAME:CONVERSION.JAVA

import java.util.Scanner;

public class Conversion {

   public static void main(String[] args) {
       // TODO Auto-generated method stub
       Scanner sc=new Scanner(System.in);
       int sum = 0;
       System.out.println("enter the input :");
       String input=sc.nextLine();
       String sb=input.toLowerCase();
       for(int i=0;i<sb.length();i++)
       {
           if (sb.charAt(i) != ' ' && sb.charAt(i) >= 'a' && sb.charAt(i) <= 'z' && sb.charAt(i) >= 'A' && sb.charAt(i) <= 'z') sum++;
         
         
           if(sum == 4) {System.out.print("-");}
         
       switch (sb.charAt(i)) {
         
       case 'a':
       case 'b':
       case 'c':
       System.out.print( "2");
       break;
       case 'd':
       case 'e':
       case 'f':
       System.out.print( "3");
       break;
       case 'g':
       case 'h':
       case 'i':
       System.out.print( "4");
       break;
       case 'j':
       case 'k':
       case 'l':
   System.out.print( "5");
       break;
       case 'm':
       case 'n':
       case 'o':
           System.out.print( "6");
       break;
       case 'p':
       case 'q':
       case 'r':
       case 's':
       System.out.print( "7");
       break;
       case 't':
       case 'u':
       case 'v':
       System.out.print( "8");
       break;
       case 'w':
       case 'x':
       case 'y':
       case 'z':
       System.out.print( "9");
       System.out.print( "\n");
       break;
  
       default:
           System.out.print( "9");
       }
       }
       sc.close();
   }
  

}