Bug #10136: printf("%.60f\n", 0.1r) shows 0.100000000000000005551115123125782702118158340454101562500000

• Status: Closed
• Assignee: -
• Target version: -
• ruby -v: ruby 2.2.0dev (2014-08-15 trunk 47187) [x86_64-linux]
• Backport: 2.0.0: UNKNOWN, 2.1: UNKNOWN

[akr (Akira Tanaka)]

printf shows 0.1r (rational) not 0.1 as follows.

% ./ruby -ve 'printf "%.60f\n", 0.1r'
ruby 2.2.0dev (2014-08-15 trunk 47187) [x86_64-linux]
0.100000000000000005551115123125782702118158340454101562500000

It seems printf converts the rational argument to a float.

I expect 0.100000000000000000000000000000000000000000000000000000000000 instead of
0.100000000000000005551115123125782702118158340454101562500000.

[naruse (Yui NARUSE)]

• Related to Bug #10135: Time.at is inaccurate added

[nobu (Nobuyoshi Nakada)]

• Status changed from Open to Closed
• % Done changed from 0 to 100

Applied in changeset r47214.

---

sprintf.c: rational 'f' format

• sprintf.c (rb_str_format): support rational 'f' format.
  [ruby-core:64382] [Bug #10136]