How can I force a decimal to be formatted with two digits?

Question

I'm trying to figure out how I can format a number, like 29.9, as 29.90. I've tried this so far:

number = 29.90
#=> 29.9

number.to_s
#=> "29.9"

number.round(2).to_s
#=> "29.9"

What method should I use to get "29.90"?

Not duplicate because I don't want to set the precision. I want to fill with 0. — Bastien Vandamme, Jun 16 '16 at 06:56
Hey, I've done my best to fix up the English in this question. Look it over and see if I messed anything up. (I assumed you meant just formatting it as a string, rather than printing it, because of your code example) — Nic, Jun 16 '16 at 07:27
@B413 in case you're wondering why I've renamed the variable: [`p`](http://ruby-doc.org/core-2.3.1/Kernel.html#method-i-p) is a method in Ruby that prints its arguments. And since you're question is related to formatting / output, a variable with the same name can be quite confusing. — Stefan, Jun 16 '16 at 07:32

score 1 · Accepted Answer · edited Jun 16 '16 at 07:33

1

'%.02f' % number
#=> "29.90"

Thanks to Gourav Naik

edited Jun 16 '16 at 07:33

Stefan

answered Jun 16 '16 at 07:03

Bastien Vandamme

devanand · Answer 2 · 2016-06-16T07:56:59.040

0

Is this working for you?

printf( "%.02f", 22.9 )

edited Jun 16 '16 at 07:56

answered Jun 16 '16 at 06:57

devanand

2 Answers2