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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724
21
章
GDB
でデバッグする
*p1
は値20を
*p2
は値10を持ち、正しそうに見える。後2つ
print
コマンドを使いプログ
ラム状態を調べ続ける。
(gdb) p p1
$5 = (int*) 0xbffff230
(gdb) p p2
$6 = (int*) 0xbffff234
(gdb)
この
print
コマンドが示すように、
*p1
と
*p2
で参照されるメモリ番地の内容ではなく、
ポインタ
p1
と
p2
の値が入れ替わってしまう。これが
swap()
のバグだった。関数を、
p1
と
p2
に格納されるポインタ値ではなく、
*p1
と
*p2
で指す
int
値を交換するよう変更する必要
がある。正しいコードを次に挙げる。
void swap(int* p1, int* p2) // *p1
と
*p2
を交換
{
int tmp = *p1;
*p1 = *p2;
*p2 = tmp;
}
コマンド
continue
（省略形は
c
）がプログラム実行を次のブレークポイントかプログラム
の末尾に達するまで実行する。
(gdb) c
Continuing.
The new values: a = 10; b = 20
Program exited normally.
(gdb)
プロンプト
(gdb)
が示すように、デバッガはまだ実行を続けている。終了するにはコマン
ド
quit
または
q
を入力する。
quit
コマンドはデバッグしているプログラムが実行を続けて
いてもデバッガを終了する。しかし、GDBはこの場合にも確認のためにプロンプトを出力
する。
(gdb) q
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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.