gistfile1.txt

def leap_year?(year)
 if (year % 4 == 0)
   return true
  elsif (!(year % 400 == 0) and (year % 100 == 0 and year % 4 == 0))
   return false
  elsif ((year % 100 == 0 and year % 400 == 0) and !(year % 4 == 0))
   return true
 end
end