public static void bitwise(int a, int b){
  System.out.println("a AND b: " + (a & b));
  System.out.println("a OR b: "+ (a | b));
  System.out.println("a XOR b: "+ (a ^ b));
  System.out.println("NOT a: " + ~a);
  System.out.println("a << b: " + (a << b));