Bug #13599: Float#ceil(n) doesn't work for small floats

• Status: Closed
• Assignee: -
• Target version: -
• ruby -v: 2.4.1
• Backport: 2.2: DONTNEED, 2.3: DONTNEED, 2.4: DONE

[Jalada (David Somers)]

When using ceil to round up to n digits (as opposed to nearest integer) with the optional first argument, it doesn't work for very small floats:

2.4.1 :001 > 0.0000000001.ceil(1)
 => 0.0   # => Expected output: 0.1

# Doing it by hand:
2.4.1 :002 > (0.0000000001 * 10).ceil / 10.0
 => 0.1

[nobu (Nobuyoshi Nakada)]

• Status changed from Open to Closed

Applied in changeset trunk|r58913.

---

numeric.c: fix for small number

• numeric.c (flo_floor, flo_ceil): should not return zero for small
  number. [ruby-core:81394] [Bug #13599]

[nagachika (Tomoyuki Chikanaga)]

• Backport changed from 2.2: UNKNOWN, 2.3: UNKNOWN, 2.4: UNKNOWN to 2.2: UNKNOWN, 2.3: UNKNOWN, 2.4: REQUIRED

[usa (Usaku NAKAMURA)]

• Backport changed from 2.2: UNKNOWN, 2.3: UNKNOWN, 2.4: REQUIRED to 2.2: DONTNEED, 2.3: DONTNEED, 2.4: REQUIRED

[nagachika (Tomoyuki Chikanaga)]

• Backport changed from 2.2: DONTNEED, 2.3: DONTNEED, 2.4: REQUIRED to 2.2: DONTNEED, 2.3: DONTNEED, 2.4: DONE

ruby_2_4 r59505 merged revision(s) 58913.