How can I round up to the next hundred? Using Ruby 2.3.2.
48 -> 100
52 -> 100
112 -> 200
Tried 48.round(-2) but that rounds down. Trialed some BigDecimal values, but that got me nowhere.
Asked
Active
Viewed 2,866 times
1
Rich_F
- 1,830
- 3
- 24
- 45
-
Searching Google for "round number to next hundred" returns a number of hits, including some on SO, which help explain it such as http://stackoverflow.com/q/19621455/128421, http://stackoverflow.com/q/8866046/128421 – the Tin Man Dec 06 '16 at 23:16
-
3Another way: `def roundup(n) 100*(1+((n-1)/100)) end; roundup(248) #=> 300; roundup(400) #=> 400; roundup(-240) #=> -200; roundup(-200) #=> -200`. – Cary Swoveland Dec 06 '16 at 23:26
-
Tin Man, several items on Google, whilst INCLUDING "Ruby", ran me into nothing but dead ends. It's why I included the version number here. Also, Ruby is not Javascript and has different methods and approaches. Same with Python. – Rich_F Dec 07 '16 at 10:49
2 Answers
14
Divide by 100 first then multiply back.
(48/100.0).ceil * 100
Alejandro C.
- 3,771
- 15
- 18
-
I was close. The significant figure is what would respect the remainder. Thank you. – Rich_F Dec 07 '16 at 10:50
-
0
Use Integer#ceil/Float#ceil, saying that you want it to round to two places before the comma:
48.ceil(-2)
This isn't available in Ruby 2.3.0, but it is in Ruby >= 2.4.0.
Richard Möhn
- 712
- 7
- 15
-
@Sujay, do you like this better? The accepted answer is right for Ruby 2.3.0, but nowadays there is a better way to round up to the next hundred. – Richard Möhn Aug 26 '21 at 21:48