ruby-dev

福間@福岡 です。

記事 <200006081625.BAA05749@hanare00.math.sci.hokudai.ac.jp> にて、
gotoken@math.sci.hokudai.ac.jp (GOTO Kentaro) さんは書きました:

> C言語では % 演算子が負のオペランドについてどう振る舞うべきか
> は決まっていますか?? 現状では、rb_fix_modulo() が % を使って
> いるので、もしCの % が処理系依存ならRubyもそれを引き継いでい
> ることになると思いました。

JIS X 3010-1993, 6.3.5 (乗除演算子) より引用:

  整数同士の除算で割り切れない場合, (中略) 一方のオペランドが負の値を
  もつ場合, / 演算子の結果が代数的な商以下の最大の整数とするか, 又は
  代数的な商以上の最小の整数とするかは, 処理系定義とし, % 演算子の結果の
  符号も処理系定義とする。商 a/b が表現できる場合, 式 (a/b)*b+a%b は,
  a に等しくなければならない。

---
 FUKUMA Yasuhiro (福間 康弘) as Yasu.F @ Kitakyushu.Fukuoka.Japan
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[#9956] Re: [ruby-list:22341] Re: undefined method — Masaki Suketa <CQN02273@...>

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[#9986] % in C — gotoken@... (GOTO Kentaro)

[#9990] Generational GC — Masato KIYAMA <masato@...>

[#10006] Re: File Utilities — WATANABE Hirofumi <eban@...>

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[#10019] NT build problem — matz@... (Yukihiro Matsumoto)

[#10032] compile error on cygwin — "Nobuyoshi.Nakada" <nobu.nakada@...>

[#10042] [PATCH] mswin32: rubytest.rb — Katsuyuki Komatsu <komatsu@...>

[#10050] sleep on Solaris — とみたまさひろ <tommy@...>

[#10051] UnixWare での Ruby のコンパイル — 市村 光康 <ichimura@...>

[#10052] win32ole and NONAMELESSUNION — Katsuyuki Komatsu <komatsu@...>

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[#10075] text/tabs.rb — Wakou Aoyama <wakou@...>

[#10081] [PATCH] module === string.extend(module).dup — nobu.nakada@...

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[#10089] Re: [ruby-ext:00646] have_func in extconf.rb — Hiroshi IGARASHI <igarashi@...>

[#10092] 正規表現で見落とし？ — ARIMA Yasuhiro <fit0298@...>

[#10095] Re: 正規表現で見落とし？ (PR#2) — matz@... (Yukihiro Matsumoto)

[#10103] pause() macro — WATANABE Hirofumi <eban@...>

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[#10109] bit fix for net/protocol.rb — Toshiro Kuwabara <toshirok@...3.so-net.ne.jp>

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[#10122] [Patch] ftpup -> ftpsync — "NAKAMURA, Hiroshi" <nakahiro@...>

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[#10124] select( [dev], nil, nil, timeout ) — ARIMA Yasuhiro <fit0298@...>

[#10125] configure.in — Tadayoshi Funaba <tadf@...>

[#10135] don't use mktemp() — Shugo Maeda <shugo@...>

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[#10145] Re: [ruby-list:23495] Re: Ruby 1.4.5 — Wakou Aoyama <wakou@...>

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[#10156] [BUG] ruby 1.5.4 (2000-06-28) [i586-linux] — Wakou Aoyama <wakou@...>

[ruby-dev:9989] Re: % in C

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[#10051] UnixWare での Ruby のコンパイル — 市村光康 <ichimura@...>

[#10116] Re: [ruby-list:23480] Re: mod_ruby での FILE — Shugo Maeda <shugo@...>