Ruby 总是围捕
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Ruby Always Round Up
提问by Brandon
I feel like a crazy person. I'd like to round all fractions up to the nearest whole number.
我觉得自己是个疯子。我想将所有分数四舍五入到最接近的整数。
For example, 67/30 = 2.233333333334. I would like to round that up to 3. If the result is not a whole number, I never want to round down, only up.
例如，67/30 = 2.233333333334。我想把它四舍五入到 3。如果结果不是整数，我从不想向下舍入，只想向上舍入。
This is what I'm trying:
这就是我正在尝试的：
puts 67/30.to_f.ceil
Here are examples of what I'm looking for:
以下是我正在寻找的示例：
- 67/30 = 3
- 50/100 = 1
- 2/2 = 1
- 67/30 = 3
- 50/100 = 1
- 2/2 = 1
Any ideas? Thanks much!
有任何想法吗？非常感谢！
回答by fivedigit
The problem is that you're currently calling ceilon 30.to_f. Here's how Ruby evaluates it:
问题是，你现在叫ceil上30.to_f。以下是 Ruby 评估它的方式：
(67)/(30.to_f.ceil)
# .ceil turns the float into an integer again
(67)/(30.0.ceil)
# and now it's just an integer division, which will be 2
67/30 # = 2
To solve this, you can just add parenthesis:
要解决这个问题，您只需添加括号：
puts (67/30.to_f).ceil # = 3
