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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17.6
数と文字列との変換
321
17.6
数と文字列との変換
標準ライブラリは数字列を解釈して数値を返すさまざまな関数を提供する。これらの関
数を表17-18に示す。数値への変換関数は解釈する文字列型と変換目標型の両方によって
異なる。
char
文字列の関数はヘッダ stdlib.hで、ワイド文字列のはヘッダ wchar.hで宣言
される。さらに、C99は文字列を最大幅の符号付き整数型
intmax_t
または符号なし整数型
uintmax_t
に変換する4関数を導入した。この4関数はinttypes.hで宣言される。
表17-18 数字列の変換
変換 stdlib.hの関数 wchar.hの関数 inttypes.hの関数
ある文字列から
int atoi()
ある文字列から
long atol()
,
strtol() wcstol()
ある文字列から
unsigned long strtoul() wcstoul()
ある文字列から
long long atoll()
,
strtoll() wcstoll()
ある文字列から
unsigned long long strtoull() wcstoull()
ある文字列から
intmax_t
strtoimax()
,
wcstoimax()
ある文字列から
uintmax_t
strtoumax()
,
wcstoumax()
ある文字列から
float strtof() wcstof()
ある文字列から
double atof()
,
strtod() wcstod()
あ
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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.