Section 11.8

// Guide to Java, Second Edition
// Copyright 2023 by J.T. Streib and T. Soma

import java.util.*;

class Bitp1 {
   static Scanner scanner;
   public static void main (String [] args){

      int x,y=0,answer=0;
      char op;

      // input binary x
      x = input8();
      // output to verify input 
      output8(x); 

      // input operation code
      scanner = new Scanner(System.in);
      System.out.println();
      System.out.print("Enter an operation ( |, ^ , & , ~ ,"
      + " L , R ): ");
      op = scanner.next().charAt(0);

      // check binary operators
      if (op=='|' || op == '^' || op == '&') {
         // input binary y
         y = input8(); 
         //ouptut to verify input
         output8(y);
      }

      // check and perform operation
      switch (op) {
         case '|': answer = x | y;
                   break;
         case '^': answer = x ^ y;
                   break;
         case '&': answer = x & y;
                   break;
         case 'L':
         case 'l': answer = x << 1;
                   break;
         case 'R':
         case 'r': answer = x >>> 1; 
                   break;
         case '~': answer = ~x;
                   break;
         default:
                   System.out.println("Invalid entry");
      }
      // Clear upper bits
      answer = answer & 0b11111111;
      // output results 
      System.out.println();
      output8(answer); 
      System.out.println();
   } 

   // input 8 binary bits
   public static int input8 () {
      int bNum;
      scanner = new Scanner(System.in);
      System.out.println();
      System.out.print("Enter a binary number: ");
      // input base 2
      bNum = scanner.nextInt(2);
      // clear upper bits
      bNum = bNum & 0b11111111;
      return bNum;
   }

   // output 8 binary characters
   public static void output8 (int bNum) {
      String bString,zString;
      // convert to string
      bString = Integer.toBinaryString(bNum);
      // insert leading zeros and output
      zString = String.format("%8s", bString).replace(' ','0');
      System.out.println(" The binary number is: " + zString);
   }
}