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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86
5
章 式と演算子
_Alignof
のオペランドは、括弧で括った型の名前で、結果の式が次の例に示すように型の
アラインメントを値とする。
_Alignof(char*) // char
ポインタのアラインメント
型のアラインメントはコンパイラが決めるので、
_Alignof
式は
sizeof
式同様、型
size_
t
の整数定数である。プログラムにヘッダファイル stdalign.hが含まれれば、キーワード
_Alignof
の代わりに同義語の
alignof
が使える。
_Alignof
演算子は、関数型や不完全オブ
ジェクト型ではない、完全オブジェクト型にのみ適用できる。オペランドが配列型なら、配
列要素の型のアラインメントを値とする。
5.2.8.5
条件演算子
条件演算子は、次のように3つのオペランドを持つ演算子なので、3項演算子とも呼ばれ
る。
condition
?
expression1
:
expression2
演算はまず条件を評価して、その結果に応じて、続く式のどちらかを評価する。
condition
の評価後に副作用完了点がある。結果が0に等しくないなら（つまり、
condition
が真）、第2オペランド
expression1
だけが評価され、演算全体の値が
expression1
の値になる。
condition
が0（つまり偽）なら、第3オペランド
expression2
だけが評価され、演算全体の値
が
expression2
の値になる。このように、条件演算子はプログラムフローでの条件ジャンプ
を表し、
if-else ...
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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.