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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17.2
数学関数
315
17.2.5.1
状態フラグにアクセス
表17-9の関数で状態フラグにアクセスできる。関数の 1引数が処理する例外の種類を示
す。次の整数マクロがfenv.hに含まれ、例外型を示す。
FE_DIVBYZERO FE_INEXACT FE_INVALID FE_OVERFLOW FE_UNDERFLOW
これらのマクロは、対応する例外をサポートする実装のときにのみ定義される。マクロ
FE_ALL_EXCEPT
はサポートされる例外型すべてを表す。
表17-9 浮動小数点例外へアクセスできる関数
目的 関数
浮動小数点例外をテスト
fetestexcept()
浮動小数点例外をクリア
feclearexcept()
浮動小数点例外を起こす
feraiseexcept()
浮動小数点例外を保存
fegetexceptflag()
浮動小数点例外を復元
fesetexceptflag()
17.2.5.2
丸めモード
浮動小数点環境は浮動小数点演算に現時点で影響する丸めモードを含む。ヘッダ
fenv.
h
はサポートする丸めモードごとに異なる整数マクロを定義する。次の各マクロは実装が対
応する丸め方向をサポートするときだけ定義される。
FE_DOWNWARD FE_TOWARDZERO FE_TONEAREST FE_UPWARD
実装は他の丸めモードとそのマクロ名を定義できる。マクロの値は関数の戻り値または
引数値として表17-10の関数で使われる。
表17-10 丸めモード関数
目的 関数
現在の丸めモードを取得
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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.