Java switch statement convert hex digit to binary

Question

We would like to write a program that prompts the user to enter a hex digit

Display its corresponding binary number.

Here is a sample run: 

Enter a hex digit: B 
The binary value is 1011 

Enter a hex digit: G 
G is an invalid input 

import java.util.Scanner;

public class Main {
  public static void main(String[] args) {
    Scanner input = new Scanner(System.in);
    System.out.print("Enter a hex character: ");
    char hex = input.nextLine().charAt(0);
    //from   ww w.ja  v a2 s  .c  om
    //your code here

    System.out.println("The binary value is " + result);
  }
}




import java.util.Scanner;

public class Main {
  public static void main(String[] args) {
    Scanner input = new Scanner(System.in);
    System.out.print("Enter a hex character: ");
    char hex = input.nextLine().charAt(0);
    
    String result = "";
    
    switch (hex) {
      case '0': result = "0"; break;
      case '1': result = "1"; break;
      case '2': result = "10"; break;
      case '3': result = "11"; break;
      case '4': result = "100"; break;
      case '5': result = "101"; break;
      case '6': result = "110"; break;
      case '7': result = "111"; break;
      case '8': result = "1000"; break;
      case '9': result = "1001"; break;
      case 'A': result = "1010"; break;
      case 'B': result = "1011"; break;
      case 'C': result = "1100"; break;
      case 'D': result = "1101"; break;
      case 'E': result = "1110"; break;
      case 'F': result = "1111"; break;
      default: System.out.println(hex + " is an invalid input"); System.exit(1);  
    }

    System.out.println("The binary value is " + result);
  }
}



PreviousNext

Related