Button Challenge.

count_symbols.rb

# # When Kevin turns on the machine, the screen displays the symbol '@'. When the button is pressed, the display of the screen changes in the following way:
#  - 1st time button is pressed: '@' turns to '&&'
#  - 2nd time button is pressed: '&&' turns to '&@&@'
#  - 3rd time button is pressed: '&@&@' turns to '&@&&&@&&'
#  - the 4th time the button is pressed: '&@&&&@&&' turns to '&@&&&@&@&@&&&@&@' and so forth.

# Requirements:
#  - Create a function called `count_symbols` that will count the number of '@'s and '&'s that are displayed on the screen after the button has been pressed ñ number of times.

def count_symbols(clicker)
  at = 1
  amp,a,b=0
  
  while (0 != clicker)
    a = amp
    b = amp + (at * 2)
    
    at = a
    amp = b
    clicker -= 1
  end
  
  return a, b
end