sum = 0.0
count = 0
loop do
  puts "Enter a number and hit enter: this program will output your number, add
        it to any previous numbers, and average all numbers you've entered so
        far. Hit enter without providing a number to exit the program."
  input = gets.chomp
  break if input == ""
  input=Float(input) rescue false
  if input then
    count = count+1
    puts "You entered #{input}"
    sum = sum + input
    puts "The sum so far is #{sum}"
    average = sum / count
    puts "The average so far is #{average}"
    puts "---"
  else puts "That's not a number. Enter a valid number. "
  end
end