4.12 (Hex to binary) Write a program that prompts the user to enter a hex digit and displays 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
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 ProgrammingEx4_12 { public static void main(String[] args) { Scanner input = new Scanner(System.in); System.out.print("Enter a hex digit: "); String hexString = input.nextLine(); // Check if the hex string has exactly one character if (hexString.length() != 1) { System.out.println("You must enter exactly one character"); System.exit(1); } // Display decimal value for the hex digit char ch = Character.toUpperCase(hexString.charAt(0)); int value = 0; if (ch <= 'F' && ch >= 'A') { value = ch - 'A' + 10; } else if (Character.isDigit(ch)) { value = ch - '0'; } else { System.out.println(ch + " is an invalid input"); System.exit(0); } System.out.println("The decimal value for hex digit " + ch + " is " + Integer.toBinaryString(value)); } }
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