https://codereview.stackexchange.com/q/191522/128441

give_me_a_number.rb

#!/usr/bin/env ruby

# Solution to the below question:
# https://codereview.stackexchange.com/questions/191522

# Initialise a variable to store the accumulating total.
total = 0

# Start an infinite loop. (When writing these, make sure there's a
# 'break' command somewhere within the loop, or it will loop forever)
loop do

  # Prompt the user for their input.
  puts 'give me a number'

  # Get the user input and chomp to remove trailing white-space.
  input = gets.chomp

  # Break out of the loop if 'stop' was input.
  break if input == 'stop'

  # Now that we know the input String is supposed to be a number,
  # we can convert it to Integer, and add it to the total.
  total += input.to_i
end

# Output the final total.
puts total