ruby code for lift(elevator)

lift_to.rb

class Lift
  GROUND_FLOOR = 1
  TOTAL_FLOOR = 10
  @@previous_floor =0
  TRAVEL_TIME = 3
  DO_DC = 10
 
 
  attr_reader :elevator_on_floor
  attr_accessor :elevator_target_floor, :new_floor
 
  def initialize
      @elevator_target_floor = GROUND_FLOOR
  end

  def call_elevator_to_floor( new_floor,entry_count)
      if new_floor <= TOTAL_FLOOR
          puts "strated to floor #{new_floor}"
          time_to_display = ((new_floor-@@previous_floor)*TRAVEL_TIME).abs
          puts "time left to reach #{time_to_display} seconds"
          @@previous_floor = new_floor
          time_passes(new_floor,time_to_display,$entry_count)
      else
        puts 'Invalid floor enter between (1 -10)'
      end
  end

  def time_passes(new_floor,time_to_display,entry_count)
     if @new_floor != @elevator_target_floor
        sleep time_to_display.abs
        $entry_count-=1
        puts "elevator has arrived at #{new_floor}"
      else
          puts "elevator has arrived at your floor"
      end
  end
end

lift = Lift.new
puts 'Enter the floor number to reach(1-10)'
$entry_count =0
while line = gets
  $entry_count+=1
  line.chomp!
     if line         
          puts lift.call_elevator_to_floor( line.to_i,$entry_count )   
       end
end