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.
13.5
ランダムファイルアクセス
227
これらの指定子はすべて、読み込んだ数値を型
float
の浮動小数点値に変換格納する。
型
double
または
long double
に変換格納したいなら、長さ修飾子
l
を
double
、
L
を
long
double
（
ll
ではない）に挿入する。例を挙げる。
float x = 0.0F;
double xx = 0.0;
// 2
つの浮動小数点数を読み込む。
1
つは
float
にもう
1
つは
double
に変換
if (scanf("%f %lf", &x, &xx) < 2)
{
/* ... */
}
この
scanf()
呼び出しが入力列
12.3 7\n
を受け取れば、値12.3を
float
変数
x
に、値7.0
を
double
変数
xx
に格納する。
13.5
ランダムファイルアクセス
ランダムファイルアクセスはファイルのどの位置でも直接情報を読んだり変更する機能
を指す。これは所与のストリームに結び付いたファイルの現在のアクセス位
置を示すファイ
ル位置表示子の取得 /設定で行う。
13.5.1
現在のファイル位置を取得
次の関数が現在のファイルアクセス位置を返す。後で戻るためにファイルの位置を求め
る必要があるときに、これらの関数の1つを使う。
long ftell(FILE*
fp
);
ftell()
は
fp
で指定したストリームのファイル位置を返す。バイナリストリームで
は、ファイルのこの位置までの文字数と同じ、すなわち、ファイルの先頭から現
在の文字までのオフセットである。エラーが起こると
ftell() ...
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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.