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ビット演算 [3]:特定のビットを0にする

More than 5 years have passed since last update.

変数の特定のビットの値を 0 にしたい場合は、そのビットのマスクの反転と算術論理積を行うといいぞ。

例えば、x の下位4ビットを0にしたい場合は以下のように記述する

x &= ~0x0f;

vivisuke
ぼちぼちソフト作家。 テニス・オセロ・ゲーム類が趣味の年齢不詳のおじさんです。vi と C++が好き。 お持ち帰りのお仕事募集中でござるぞ。 迷走中・・・
http://vivi.dyndns.org/
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