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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52
4
章 型変換
通り。
The rounding error (f_var - l_var;) is 3.000000
浮動小数点型の値はいずれも、より大きな精度の浮動小数点型で正確に表せる。
double
値が
long double
、あるいは、
float
値が
double
または
long double
に変換されるときには、
値は正確に保存される。精度の大きな型から小さな型への変換では、変換される値が新た
な型の値範囲を超えかねない。変換した型の値範囲を超えたときの変換結果は未定義であ
る。値範囲に収まってはいるが、変換した型の精度では正確に表現できないなら、結果は
大小問わず最も近い表現可能値になる。例2-2のプログラムは、精度の低い浮動小数点型へ
の変換による丸め誤差を示している。
複素数を実浮動小数点型に変換するときには、虚部は捨てられ、結果が複素数の実部に
なるが、この節で述べた変換先の型への変換がさらに生じることもある。
4.1.5.5
複素浮動小数点型への変換
整数または実浮動小数点数を複素型に変換するとき、前節で述べたように結果の実部は、
その値を対応する実浮動小数点型に変換して得られる。虚部は0だ。
複素数を異なる複素型に変換するときは、実部と虚部を別々に実浮動小数点型の規則に
従って変換する。
#include <complex.h> //
虚数定数
I
のようなマクロを定義
double _Complex dz = 2;
float _Complex fz = dz + I;
この2つの初期化の最初
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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.