Leap year checker, chapter 7 of Chris Pine

leap_year.rb

# Leap Years
# well, we need a year.
puts 'Pick a year any year!'
year = gets.chomp

# then we need to see if it is divisible by 4 
# and not 100 
# unless it's also divisible by 400

# could use %  which is 'modulus' and divides the number but 
# returns just the remainder
# instead, comparing floats and integers

# first remove those not divisible by 4
if (year.to_f / 4) != (year.to_i / 4)
  puts 'FUCK THAT.'
elsif
  # then get rid of those divisible by 100
  if (year.to_f / 100) != (year.to_i / 100)
    puts year + ' was so rad!'
  elsif
    # . . . except for the ones divisible by 400
    if (year.to_f / 400) != (year.to_i / 400)
      puts 'Nice try.'
    else
      puts 'That\'s the best year ever! Let\'s go back to ' + year + '.'
    end
  end
  puts 'Yeah, ' + year + ' was pretty primo.'
end