Question

In: Computer Science

import java.util.Scanner; public class test {    public static void main(String args[]){        char letter;...

import java.util.Scanner;
public class test {
   public static void main(String args[]){
       char letter;
       int number = 0;
       Scanner in = new Scanner(System.in);
       System.out.print("Enter a letter: ");
       letter = in.next().charAt(0);
       if(letter == 'A' || letter == 'B' || letter == 'C') number = 2;
       if(letter == 'D' || letter == 'E' || letter == 'F') number = 3;
       if(letter == 'G' || letter == 'H' || letter == 'I') number = 4;
       if(letter == 'J' || letter == 'K' || letter == 'L') number = 5;
       if(letter == 'M' || letter == 'N' || letter == 'O') number = 6;
       if(letter == 'P' || letter == 'R' || letter == 'S') number = 7;
       if(letter == 'T' || letter == 'U' || letter == 'V') number = 8;
       if(letter == 'W' || letter == 'X' || letter == 'Y') number = 9;
       if(letter == 'Q' || letter == 'Z') number = -1;
       if(number > 0) System.out.println("Letter " + letter + " corresponds to digit " + number);
       else System.out.println("Letter " + letter + " is not used in a telephone");
   }
}

My question is how can I use Switch statement in this program?

Solutions

Expert Solution

ANSWER:-

import java.util.Scanner;
public class test {
public static void main(String args[]){
char letter;
int number = 0;
Scanner in = new Scanner(System.in);
System.out.print("Enter a letter: ");
letter = in.next().charAt(0);
switch(letter)
{
    case 'A':
case 'B':
case 'C':
   number=2;
   break;
case 'D':
case 'E':
case 'F':
   number=3;
   break;
case 'G':
case 'H':
case 'I':
   number=4;
   break;
case 'J':
case 'K':
case 'L':
   number=5;
   break;
case 'M':
case 'N':
case 'O':
   number=6;
   break;
case 'P':
case 'R':
case 'S':
   number=7;
   break;
case 'T':
case 'U':
case 'V':
   number=8;
   break;
case 'W':
case 'X':
case 'Y':
   number=9;
   break;
case 'Q':
case 'Z':
   number=-1;
   break;
}
if(number > 0) System.out.println("Letter " + letter + " corresponds to digit " + number);
else System.out.println("Letter " + letter + " is not used in a telephone");
}
}

// If any doubt please comment

venereology answered 2 months ago
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