def prompt
   print ">> "
 end

 puts "welcome to the weight-calc 3000! Enter you weight below!"

 prompt; weight = Integer(gets.chomp())

 if weight > 100 && weight < 300
   puts "your healthy!"
 elsif weight > 300
   puts "your fat"
 elsif weight < 100
   puts "your skinny"
 elsif weight == 150
   puts "your perfect"
 end

if weight > 100 && weight < 300