Ruby只为字符串获取/放置？ [英] Ruby gets/puts only for strings?

问题描述

我是Ruby新手，我目前正在研究一些类似于以下内容的练习代码：

I'm new to Ruby and am currently working on some practice code which looks like the following:

puts 'Hello there, Can you tell me your favourite number?'
num = gets.chomp
puts 'Your favourite number is ' + num + '?'
puts 'Well its not bad but  ' + num * 10 + ' is literally 10 times better!'

这段代码只是放了十份num变量并没有实际乘以数字所以我假设我需要将'num'变量设为整数？我没有成功，所以有人能告诉我哪里出错吗？

This code however just puts ten copies of the num variable and doesn't actually multiply the number so I assume I need to make the 'num' variable an integer? I've had no success with this so can anyone show me where I'm going wrong please?

推荐答案

如果您正在使用 to_i ，然后 chomp ，然后才是多余的。所以你可以这样做：

If you are using to_i, then chomp before that is redundant. So you can do:

puts 'Hello there, Can you tell me your favourite number?'
num = gets.to_i
puts 'Your favourite number is ' + num.to_s + '?'
puts 'Well its not bad but  ' + (num * 10).to_s + ' is literally 10 times better!'

但一般来说，使用＃{}更好，因为你不必关心 to_s ，它运行得更快，更容易看到。方法 String＃+ 特别慢。

But generally, using "#{}" is better since you do not have to care about to_s, and it runs faster, and is easier to see. The method String#+ is particularly very slow.

puts 'Hello there, Can you tell me your favourite number?'
num = gets.to_i
puts "Your favourite number is #{num}?"
puts "Well its not bad but  #{num * 10} is literally 10 times better!"

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