leap_year.rb

# Write a function that returns true or false depending on
# whether its input integer is a leap year or not.
#
# A leap year is defined as one that is divisible by 4,
# but is not otherwise divisible by 100 unless it is
# also divisible by 400.
#
# For example, 2001 is a typical common year and 1996
# is a typical leap year, whereas 1900 is an atypical
# common year and 2000 is an atypical leap year.

def leap_year?(input_integer)
  (input_integer % 4 == 0) && divisible_logic?(input_integer)
end

def divisible_logic?(input_integer)
  if input_integer % 100 > 0
    return true
  end

  if input_integer % 400 == 0
    return true
  end
  
  false
end