ruby-dev

えぐち＠エスアンドイー です。

>>> In message [ruby-dev:6639] -2**2 => 4
    On Thu, 22 Apr 1999 10:41:40 +0900, Inaba Hiroto <inaba@sdd.tokyo-sc.toshiba.co.jp> said:

inaba> 稲葉です.
inaba> 
inaba> fj.sci.mathを読んでいて, 昔Perlでも単項-とべき乗**にからむバグがあった
inaba> (らしい)ことを思いだして, 
inaba> 
inaba>  % perl -le 'print -2**2'
inaba>  -4
inaba> 
inaba> と試してみました. ついでにrubyでやってみたところ, 
inaba> 
inaba>  % ruby -le 'print -2**2'
inaba>  4

興味深い問題ですね。

ruby の挙動(-2 で１つのトークン)も一理あると思います。

ちなみに

  % awk --version
  Gnu Awk (gawk) 2.15, patchlevel 5
  % awk 'BEGIN {print -2**2}'
  -4

でした。(うぅむ)

C には ** ないしなぁ。。
単項マイナスより強い二項演算子ってありましたっけ？

他の言語はどうなんでしょうか、(Fortran とか)

	えぐち

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[#5897] Re: Queue#pop should be Queue#shift — Inaba Hiroto <inaba@...>

[#5901] Re: Ruby 1.3.2-990413 — WATANABE Tetsuya <tetsu@...>

[#5902] Re: Ruby 1.3.2-990413 — 助田 雅紀 <masaki.suketa@...>

[#5903] Re: <<-END — WATANABE Hirofumi <watanabe@...>

[#6537] Ruby 1.3.2-990402 — Yukihiro Matsumoto <matz@...>

[#6538] `step' and `next' in debug.rb — "NAKAMURA, Hiroshi" <nakahiro@...>

[#6540] [patch] ruby-1.3.2-990402 — KIMURA Koichi <kbk@...>

[#6543] substring,subarray — ttate@...

[#6551] Ruby 1.3.2-990405 — Yukihiro Matsumoto <matz@...>

[#6556] Re: [ruby-list:13297] Re: alternative name of iterator — Wakou Aoyama <wakou@...>

[#6558] [Req] const — Shugo Maeda <shugo@...>

[#6562] Re: [REQ] Object#+@ as identity (Re: [REQ] p -10 == p(-10)) — Inaba Hiroto <inaba@...>

[#6565] Ruby 1.3.2-990408 — Yukihiro Matsumoto <matz@...>

[#6567] Ruby 1.2.4 — Wakou Aoyama <wakou@...>

[#6569] Re: Ruby 1.3.2-990405 — 助田 雅紀 <masaki.suketa@...>

[#6571] Re: Ruby 1.3.2-990405 — KIMURA Koichi <kbk@...>

[#6574] when ruby-1.4.x be released? — Dai <MAP2303@...>

[#6575] [Fwd] win32 requiest — gotoken@... (GOTO Kentaro)

[#6586] Re: Ruby 1.3.2-990408 — Inaba Hiroto <inaba@...>

[#6588] <<-END — Wakou Aoyama <wakou@...>

[#6590] Ruby 1.3.2-990413 — Yukihiro Matsumoto <matz@...>

[#6593] Re: Ruby 1.3.2-990413 — SHIROYAMA Takayuki <psi@...>

[#6596] Re: Ruby 1.3.2-990413 — 助田 雅紀 <masaki.suketa@...>

[#6597] Queue#pop should be Queue#shift — Inaba Hiroto <inaba@...>

[#6600] Re: [ruby-list:13674] Re: /.*\n$/ — Wakou Aoyama <wakou@...>

[#6603] Re: Ruby 1.3.2-990413 — 助田 雅紀 <masaki.suketa@...>

[#6614] Re: IPv6-ready ruby (Forward: [ruby-talk:00274]) — gotoken@... (GOTO Kentaro)

[#6616] ruby-1.3.2-990413 AIX patch — Katsuyuki Komatsu <komatsu@...>

[#6617] Re: IPv6 ruby — Jun-ichiro itojun Hagino <itojun@...>

[#6622] [PATCH] RUBYLIB_PREFIX(ruby 1.2.5) — WATANABE Hirofumi <watanabe@...>

[#6628] [BUG] 1.instance_variables ==> SEGV — Yasuhiro Fukuma <yasuf@...>

[#6629] strdup on glibc2.1 — ttate@...

[#6639] -2**2 => 4 — Inaba Hiroto <inaba@...>

[#6641] Re: -2**2 => 4 — Inaba Hiroto <inaba@...>

[#6644] add me — matz <matz@...>

[#6645] [PATCH] AIX CONFIG["LDSHARED"] and installation — Katsuyuki Komatsu <komatsu@...>

[#6646] Re: -2**2 => 4 — Inaba Hiroto <inaba@...>

[#6647] chomp, chop — WATANABE Hirofumi <watanabe@...>

[#6657] Ruby の講師 — hisanori@...

[#6667] Open CVS — matz@... (Yukihiro Matsumoto)

[#6678] RUBYLIB_PREFIX — WATANABE Hirofumi <eban@...>

[#6685] [BUG][patch] String#[]= — Shugo Maeda <shugo@...>

[#6689] Ruby 1.3.3-990430 — matz <matz@...>

[#6693] [BUG] rb_ary_s_create() — Koji Arai <JCA02266@...>

[ruby-dev:6640] Re: -2**2 => 4

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[#5902] Re: Ruby 1.3.2-990413 — 助田　雅紀 <masaki.suketa@...>

[#6569] Re: Ruby 1.3.2-990405 — 助田　雅紀 <masaki.suketa@...>

[#6596] Re: Ruby 1.3.2-990413 — 助田　雅紀 <masaki.suketa@...>

[#6603] Re: Ruby 1.3.2-990413 — 助田　雅紀 <masaki.suketa@...>