1  import java.util.Scanner;

  2  

  3  /**

  4     This program simulates an elevator panel that skips the 13th floor, checking for 

  5     input errors.

  6  */

  7  public class ElevatorSimulation2

  8  {

  9     public static void main(String[] args)

 10     {  

 11        Scanner in = new Scanner(System.in);

 12        System.out.print("Floor: ");

 13        if (in.hasNextInt())

 14        {

 15           // Now we know that the user entered an integer

 16  

 17           int floor = in.nextInt();

 18  

 19           if (floor == 13)

 20           {

 21              System.out.println("Error: There is no thirteenth floor.");

 22           }

 23           else if (floor <= 0 || floor > 20)

 24           {

 25              System.out.println("Error: The floor must be between 1 and 20.");

 26           }

 27           else

 28           {

 29              // Now we know that the input is valid

 30  

 31              int actualFloor = floor;

 32              if (floor > 13)

 33              {  

 34                 actualFloor = floor - 1;

 35              }

 36  

 37              System.out.println("The elevator will travel to the actual floor "

 38                 + actualFloor);

 39           }

 40        }

 41        else

 42        {

 43           System.out.println("Error: Not an integer.");

 44        }

 45     }

 46  }