puts 'Hello World!'
greeting = 'Good morning!'
puts greeting


forecast = "rainy" # string
temperature = 32 # number
is_summer = true # boolean
# overwrite the existing value with a new one
forecast = "sunny"
print "It's going to be #{forecast}, #{temperature} degrees outside today. "


# output to the same line.
print 'It\'s going to be a great day!'