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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98
6
章 文
6.4
選択文
選択文はプログラム実行のフローを指定された条件に応じて異なる経路に変更する。C
には2つの選択文、
if
および
switch
がある。
6.4.1
if
文
if
文は次の形式をとる。
if (
expression
)
statement1
[ else
statement2
]
else
句はオプション。
expression
がまず評価され、2つの文のどちらを実行するか決める。
式
expression
はスカラ型でなければならない。値が
true
、0と等しくないなら、
statement1
が実行される。それ以外は、
statement2
があれば実行される。
次の例は再帰関数で
if
を使い、再帰終了条件をチェックする。
// power.c :
再帰関数
power()
浮動小数点数の整数べきを計算する。
// ---------------------------------------------------
doubl
e power(double base, unsigned int exp)
{
if (exp == 0) return 1.0;
else return base * power(base, exp-1);
}
複数の
if
文が入れ子だと、
else
句は常に（入れ子のレベルが同じブロックの）まだ
else
句を持たない最後の
if
に属する。
if (n > 0)
if (n % 2 == 0)
puts("n is positive and even");
else //
これは
puts("n ...
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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.