如何计算文本文件中所有数字的总和

Question

我有文本文件t.txt，我想计算文本文件中所有数字的总和 示例

    --- t.txt ---
The rahul  jumped in 2 the well. The water was cold at 1 degree Centigrade. There were 3 grip holes on the walls.  The well was 17 feet deep.
--- EOF --

求和 2+1+3+1+7 我的 ruby 计算总和的代码是

ruby -e "File.read('t.txt').split.inject(0){|mem, obj| mem += obj.to_f}"

但是我没有得到任何答复？？

Answer 1

str = "The rahul  jumped in 2 the well. The water was cold at 1 degree Centigrade. There were 3 grip holes on the walls.  The well was 17 feet deep."

获取所有整数的总和：

str.scan(/\d+/).sum(&:to_i)
# => 23 

或者像您的示例一样获取所有数字的总和：

str.scan(/\d+?/).sum(&:to_i)
# => 14

PS：我用了sum看到Rails标签。如果您只使用 Ruby，则可以改用 inject。 inject

示例

str.scan(/\d/).inject(0) { |sum, a| sum + a.to_i }
# => 14
str.scan(/\d+/).inject(0) { |sum, a| sum + a.to_i }
# => 23

Answer 2

您的语句计算正确。只需在 File read as 之前添加 puts:

ruby -e "puts File.read('t.txt').split.inject(0){|mem, obj| mem += obj.to_f}"
# => 23.0

仅对个位数求和：

ruby -e "puts File.read('t.txt').scan(/\d/).inject(0){|mem, obj| mem += obj.to_f}"
# => 14.0

谢谢