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
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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.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.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.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.
76
5
章 式と演算子
BooleanAND, OR, NOTの他にビット排他和演算子がある。すべて表5-11に示される。
表5-11 Booleanビット演算子
演算子 意味 例 各ビット位置の結果（1=true,0=false）
&
ビット積
x & y x
と
y
がともに1なら1。
x
と
y
のどちらかが0なら0
|
ビット和
x | y x
と
y
のどちらかが1なら1。
x
と
y
ともに0なら0
^
ビット排他和
x ^ y x
と
y
が同じでなければ1。
x
と
y
が同じなら0
~
ビット否定（1の補数）
~x x
が0なら1。
x
が1なら0
ビット演算子のオペランドは整数型でなければならず、通常の算術型変換の対象となる。
オペランドの共通型が結果の型になる。表5-12はこれらの演算の結果を示す。
表5-12 ビット演算の結果
式（または宣言） ビットパターン
int a = 6; 0
…
0 0 1 1 0
int b = 11; 0
…
0 1 0 1 1
a & b 0
…
0 0 0 1 0
a | b 0
…
0 1 1 1 1
a ^ b 0
…
0 1 1 0 1
~a 1
…
1 1 0 0 1
整数変数
a
のビットを対応するビットが0の整数とビット積を取ることでクリアでき、結
果を
a
に代入できる。ビットマスクと呼ばれる第2オペランドのセットされていたビットは
第1オペランドと同じ値を持つ。例えば、ビットマスク
0xFF
は、下位8ビットを除いてビッ
トクリアする。
a &= 0xFF; // a = a & 0xFF;
と等価な表記
この例からわかるよ ...
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
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.