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# Ruby variables

  a = 1
  puts a


  b = "Hello"
  puts b

#  Types of variables

   local variables
   instance variables
   global variables
   constants



# Global variables

  # Globals have a $ in front and are typically written in lower case 
  # You don't use it very often

# Constants
  # WRITTEN IN ALL UPPER CASE

# Local Variable
  # Typically written in lower case and underscored - lower case
  # You can access any whee else just inside de function ex: def order

# Instance Variable 
  # local vs instance (this is available trought out your class -  it can be access inside order) - lower case

$toppings = false  #  $toppings -  Global variables

class Burger   # class name use camel the first letter is uppercase
	AVAILABLE_TOPPINGS = ["lettuce", "tomato", "onion", "pickles", "relish"] # AVAILABLE_TOPPINGS - Constants

    attr_reader :options

 def initialize
 	@toppings = [] # @toppings - instance variables
 end

 def order
 	print "How many burgers would you like? "
 	number = get.chomp                         # number - local variable
 	puts "#{number} burgers coming right up."
 end

end

burger = Burger.new("lettuce")
burger.order

# Control Flow

a = 3

if a == 1
    puts "a is 1"
elsif a == 2
    puts "a is 2"
else 
	puts " I don't know the value of a"
end

-------
# case statement 

case a
when 1
    puts "a is 1"
when 2
    puts "a is 2"
else 
	puts " I don't know the value of a"
end