Telephone keypads have an international standard for mapping the alphabet to the

Question

Telephone keypads have an international standard for mapping the alphabet to the number keys. This can be seen in the image below: Write a program which can take a series of 10 letters and converts them to the corresponding phone number. Input Validation: The input must be exactly 10 characters, no more, no less. Requirements: The output must be formatted in the following format (###) ###-####. You are NOT allowed to use loops or arrays. You may only use coding techniques found in chapters. Your program must work for any input. Sample Output: Enter input: CODEISLIFE Phone Number: (263) 347-5433

Explanation / Answer

Please find the required program and output below: Please find the comments against each line for the description:

import java.util.Scanner;
class Test {
  
   public static void main(String args[]){
      
       Scanner scanner = new Scanner(System.in);
      
       System.out.println("Enter input: ");
       String input = scanner.next();   //read the input from user

       if(input.length() != 10){   //if the input string length in not 10
           System.out.println("Invalid input...It must be 10 characters.");
       }else{
           input = input.toUpperCase(); //convert input to upper case
           String output = "(";   //create the output format
           output += getNumber(input.charAt(0));
           output += getNumber(input.charAt(1));
           output += getNumber(input.charAt(2));
           output += ") ";
           output += getNumber(input.charAt(3));
           output += getNumber(input.charAt(4));
           output += getNumber(input.charAt(5));
           output += "-";
           output += getNumber(input.charAt(6));
           output += getNumber(input.charAt(7));
           output += getNumber(input.charAt(8));
           output += getNumber(input.charAt(9));
          
           System.out.println("Phone Number: "+output);
       }

   }
  
   //returns the corresponding number mapping of an alphabet
   public static int getNumber(char c){
       switch(c){
           case 'A':
           case 'B':
           case 'C': return 2;
           case 'D':
           case 'E':
           case 'F': return 3;
           case 'G':
           case 'H':
           case 'I': return 4;
           case 'J':
           case 'K':
           case 'L': return 5;
           case 'M':
           case 'N':
           case 'O': return 6;
           case 'P':
           case 'Q':
           case 'R':
           case 'S': return 7;
           case 'T':
           case 'U':
           case 'V': return 8;
           case 'W':
           case 'X':
           case 'Y':
           case 'Z': return 9;
           default :
               return -1;
       }
   }

-------------------------------------------------------------

OUTPUT:

Enter input:
CODEISLIFE
Phone Number: (263) 347-5433

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