Home/ Questions/Q 8763113
In Process

The Archive Base Latest Questions

Editorial Team
  • 0
Asked: 2026-06-13T15:42:16+00:00

Running ruby 1.8.7. (1.005 * 100).round result: 100 (1.006 * 100).round result: 101 100.5.round

  • 0

Running ruby 1.8.7.

(1.005 * 100).round
result: 100

(1.006 * 100).round
result: 101

100.5.round
result: 101

(1.005 * 100)
result: 100.5

What is going on here? Can someone try this in the latest version of ruby please?
Thanks!

Share

Leave an answer

You must login to add an answer.

Need An Account,

1 Answer

  1. Editorial Team

    Floating Point Math is what’s going on.

    For the last one, I do not get 100.5, and you aren’t either, even if for some reason it’s displaying as that:

    Loading development environment (Rails 3.2.8)
1.9.3p194 :001 > (1.005 * 100).round
 => 100 
1.9.3p194 :002 > (1.006 * 100).round
 => 101 
1.9.3p194 :003 > 100.5.round
 => 101 
1.9.3p194 :004 > (1.005 * 100)
 => 100.49999999999999
    • 0