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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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.
458
18
章 標準ライブラリ関数
■
参照
●
isgreater()
,
isgreaterequal()
,
isunordered()
islower
文字が小文字かテストする
#include <ctype.h>
int islower(int
c
);
関数
islower()
は文字引数が小文字かどうかをテストする。どの文字が英字でどの英字
が小文字かは
setlocale()
関数でクエリと変更ができるロケールカテゴリ
LC_CTYPE
のロ
ケール設定に依存する（
isalpha()
の文字クラスとロケールについての注記参照）。
文字が小文字なら
islower()
は非ゼロ値（真）を返す。それ以外は0（偽）を返す。
デフォルトのロケールCでは、
isupper()
と
islower()
の値は英字について相互排他であ
る。しかし、他のロケールでは英字だが大文字と小文字の両方が
true
を返すのがあったり、
大文字でも小文字でもない文字がある。
■
例
本章の
isprint()
の例を参照。
■
参照
●
isupper()
,
tolower()
,
toupper()
●
ワイド文字の対応C99関数
iswlower()
●
isalnum()
,
isalpha()
,
isblank()
,
iscntrl()
,
isdigit()
,
isgraph()
,
isprint()
,
ispunct()
,
isspace()
,
isxdigit()
,
setlocale()
isnan
C99
浮動小数点値が
NaN
かどうかをテストする ...
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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.