December 2016
Intermediate to advanced
440 pages
9h 44m
Japanese
Content preview from アルゴリズムクイックリファレンス 第2版
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44
■
3
章 アルゴリズムの構成要素
ず、正しいコードを書くことが実に難しくなる。さらに追加すれば、この解法では、
値の符号（
0
、正、負）を用いて決定する共線問題は解くことができない。
3.4.4
特殊な値
64
ビットのあらゆる値が、有効な浮動小数点数として表現できるが、
IEEE
標準
では、特別な数として解釈されるいくつかの値を表3-4のように定義している（これ
らは
ADD
や
MULT
のような標準数学計算には使えないことも多い）。これらの値
は、
0
による除算、負数の平方根、オーバーフロー、アンダーフローなどのよく生
じるエラーからの回復を容易にするように設計されている。正のゼロと負のゼロと
いう値もこの表に含まれていることに注意。これらは、計算に使用できる。
表3-4 特別なIEEE 754の値
特別な値 64ビット IEEE754 表現
正の無限大
0x7ff0000000000000L
負の無限大
0xfff0000000000000L
非数（
NaN
）
0x7ff0000000000001L
から
0x7fffffffffffffffL
および
0xfff0000000000001L
から
0xffffffffffffffffL
負のゼロ
0x8000000000000000
正のゼロ
0x0000000000000000
これらの特殊な値は、計算結果が受容可能な範囲から外れたときに生じる。
Java
計算の式
double x=1/0.0
は正の無限大になる。
double x=1/0
という文であるなら、
Java
仮想機械は
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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.