如何计算的所有文本文件

Question

我有文本文件t.txt的数字总和，我想计算的所有数字之和在文本文件中 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 -- 

总和2 + 1 + 3 + 1 + 7 我的Ruby代码来计算总和

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

，但我没有得到任何答案？

Answer 1

你的说法是否正确计算。只需添加看跌之前文件的阅读：

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

仅供总结单一的数字：

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

感谢

Answer 2

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." 

要获得所有整数的总和：

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

或获得的所有数字之和为你的例子：

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

PS：我以前sum看到Rails标签。如果您只使用Ruby，则可以使用inject代替。 实例与inject

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