May 2019
Beginner to intermediate
296 pages
6h 58m
Japanese
Content preview from IT用語図鑑 ビジネスで使える厳選キーワード256
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82
関連用語
用語に関連する話
用語の使用例
10進法と2進法、
16進法
10進数から2進数への変換
整数の10進数を2進数に変換する
には、変換したい10進数を商が0
になるまで2で割り続け、求めた
余りを逆から並べる方法がよく
使われる。
16進数が使われる
カラーコード
HTMLなどで色を表現するために
カラーコードと呼ばれる文字列が
使われ、色の RGB 値を16進数で表
現する（例:#FFFFFF は白）。
負の数には2の補数を使う
コンピュータで2進法を使って負
の値を表現する場合、桁数を32
ビットなどで固定し、各桁の0と1
を入れ替えて、1を足した「2の補
数」が使われる。
コンピュータ内 部で の 数 値 表 現
0 〜 9 までの 10 個の数字で数を表す方法を 10 進法と言う。一方、コンピュータは 0 と 1
の 2 つの数字で表す 2 進法を使っている。2 進法では大きい数を表現すると桁数が 多くなっ
てしまうため 、4 桁 分 をまとめ て「 0 〜 F 」の 1 6 種 類 を使った 1 6 進 法 で 書くことが 多 い 。
▶
じっし ん ほう
▶
にしん ほう
▶
じゅうろくしん ほう
Keyword
067
「Windowsの電卓を使えば10進法から2進法、16進法への変換も簡単にできるよ。」
IP アドレスとポート番 号
……P56
CSS
……P158
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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.