package rebelsky.pal;

/**
 * Stop a program in PAL, the Pseudo-assembly language.
 *
 * @author Samuel A. Rebelsky
 * @version 1.0 of November 2002.
 */
public class Halt
  implements Instruction
{
  // +--------------+------------------------------------------------------
  // | Constructors |
  // +--------------+

  /** 
   * Build a new halt instruction.
   */
  public Halt()
  {
  } // Halt()


  // +---------+-----------------------------------------------------------
  // | Methods |
  // +---------+

  /** 
   * Execute the instruction on a machine.  The computer is responsible
   * for checking for a halt and stopping, so this is a no-op.
   */
  public void execute(Computer hal)
  {
  } // execute(Computer)

  /** Convert the instruction to a string (usually for printing). */
  public String toString() {
    return "  HALT";
  } // toString()

} // class Halt