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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508
18
章 標準ライブラリ関数
modf
浮動小数点数を整数部と小数部に分ける
#include <math.h>
double modf(double
x
, double* intpart);
float modff(float
x
, float* intpart); (C99)
long double modfl(long double
x
, long double* intpart); (C99)
modf()
関数は浮動小数点数を分析して整数と大きさが1より小さい小数部に分ける。整
数部分は第2引数が指すアドレス位置に格納し、小数部分が戻り値になる。
modf()
関数には型総称マクロはない。
■
例
double x, integer = 0.0, fraction = 0.0;
x = 1.23;
fraction = modf(x, &integer);
printf("%10f = %f + %f\n", x , integer, fraction);
x = -1.23;
fraction = modf(x, &integer);
printf("%10f = %f + %f\n", x , integer, fraction);
出力
1.230000 = 1.000000 + 0.230000
-1.230000 = -1.000000 + -0.230000
■
参照
●
frexp()
mtx_destroy
C11
指定した
mutex
を破壊する
#include <threads.h>
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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.