/*
   Project 5-3
   A class that displays the binary representation of a value.
*/
class ShowBits {
  int numbits;

  ShowBits(int n) {
    numbits = n;
  }

  void show(long val) {
    long mask = 1;

    // left-shit a 1 into the proper position
    mask <<= numbits-1;

    int spacer = 0;
    for(; mask != 0; mask >>>= 1) {
      if((val & mask) != 0) System.out.print("1");
      else System.out.print("0");
      spacer++;
      if((spacer % 8) == 0) {
        System.out.print(" ");
        spacer = 0;
      }
    }
    System.out.println();
  }
}

// Demonstrate ShowBits.
class ShowBitsDemo {
  public static void main(String[] args) {
    ShowBits b = new ShowBits(8);
    ShowBits i = new ShowBits(32);
    ShowBits li = new ShowBits(64);

    System.out.println("123 in binary: ");
    b.show(123);

    System.out.println("\n87987 in binary: ");
    i.show(87987);

    System.out.println("\n237658768 in binary: ");
    li.show(237658768);

    // you can also show low-order bits of any integer
    System.out.println("\nLow order 8 bits of 87987 in binary: ");
    b.show(87987);
  }
}