From: nobu@... Date: 2016-09-22T06:33:07+00:00 Subject: [ruby-core:77349] [Ruby trunk Bug#12548] Rounding modes inconsistency between round versus sprintf Issue #12548 has been updated by Nobuyoshi Nakada. Noah Gibbs wrote: > It appears both tests won't work if we correctly implement the round-even behavior, so the new patch fixes those. That is what I had mentioned. ---------------------------------------- Bug #12548: Rounding modes inconsistency between round versus sprintf https://bugs.ruby-lang.org/issues/12548#change-60595 * Author: Kieran McCusker * Status: Open * Priority: Normal * Assignee: * ruby -v: 2.4.0 * Backport: 2.1: UNKNOWN, 2.2: UNKNOWN, 2.3: UNKNOWN ---------------------------------------- Hi I've found this possible bug with sprintf in our production code, but it seems very odd that no one has reported it so I'm doubting myself. I've tested a few versions (CRuby 2.3.1 and 2.1.9) and it was present in both. To reproduce in irb: sprintf('%1.0f', 12.5) Expected result 13 actual 12 In fact if you look at the number sequence 0.5 -> 99.5 you find the even half will all round down and the odd half round up. 12.5.round produces the correct result (13) If you do the same in jruby 2.2.1 you get the expected result of 13. Many thanks Kieran ---Files-------------------------------- round_even.patch (4.43 KB) -- https://bugs.ruby-lang.org/ Unsubscribe: