November 2016
Beginner to intermediate
816 pages
19h 58m
Japanese
Content preview from Cクイックリファレンス 第2版
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1.6
識別子
13
表1-2 トライグラフ
トライグラフ 等価文字
??( [
??) ]
??< {
??> }
??= #
??/ \
??! |
??' ^
??- ~
トライグラフを使えば、7ビットASCIIに対応する1991年 ISO/IEC 646で定義された文
字だけでCプログラムを書ける。コンパイラのプリプロセッサがコンパイルの第1段階でト
ライグラフを等価な文字に置き換える。これは、ダイグラフと異なり、トライグラフが文字
定数、文字列リテラル、コメント、プリプロセッサ指令など、どこにあっても等価な文字に
置き換えられることを意味する。例えば、プリプロセッサは、次の文の2番目と3番目の疑
問符をトライグラフの開始と解釈する。
printf("Cancel???(y/n) ");
したがって、この行は、意図しないプリプロセッサ出力になってしまう。
printf("Cancel?[y/n) ");
このような3文字連をトライグラフとして解釈されないようにするには、疑問符をエス
ケー
プシーケンスで表す。
printf("Cancel\?\?\?(y/n) ")
疑問符2つの次の文字が表1-2にない文字であれば、それはトライグラフではないので置
き換わることはない。
ダイグラフとトライグラフの他に、記号の代替として、
C
の論理演算子と
ビット演算子の代替表現を定義するマクロはヘッダファイル
iso646.h
に含
まれる。
&&
の
and
や
^
の
xor
など。
16
章を参照。
1.6
識別子
識別子という用語はCプログラムで定義される変数、関数、マク ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.