如何让Ruby程序读取输入数字至输入'end'后计算总和？

Hey there! Let's get your program working correctly. I'll break down the issues in your code first, then show you a couple of simple, working versions tailored for a new programmer. 😊

What was off with your original code? #

• You only read input once at the start (a=gets.to_s), so the loop would keep reusing that first value forever instead of asking for new input each time.
• The while a=a.to_s condition always stays true (non-empty strings count as "true" in Ruby), so the loop would never stop on its own—only if it hits the break.
• Your puts n comes right after break—once you break out of the loop, that line never gets to run!

Working Version 1 (Using loop - super easy to read) #

sum = 0

loop do
  # Get input and remove the extra newline character with chomp
  input = gets.chomp

  # Stop the loop immediately if user types "end"
  break if input == "end"

  # Convert input to integer and add to our total sum
  sum += input.to_i
end

# Print the final sum after the loop finishes
puts "Total sum: #{sum}"

Working Version 2 (Using while loop if you prefer that style) #

If you'd rather stick with a while loop, here's how to structure it properly:

sum = 0
input = ""

while input != "end"
  input = gets.chomp
  # Only add to sum if the input isn't "end"
  sum += input.to_i unless input == "end"
end

puts "Total sum: #{sum}"

Quick tips to remember: #

• Use gets.chomp to clean up user input—it removes the hidden newline character that gets added when you press Enter.
• Always read new input inside the loop, so the program asks for a fresh value every time it runs through the loop.
• Calculate the sum only when the input is a number, and print the final total after the loop has finished.

内容的提问来源于stack exchange，提问作者Lampob02