什么是单词边界？ [英] what is word boundary?
问题描述
有人可以指导我什么是单词边界吗？
google对我来说没有好处
提前感谢
Can some one guide me what is word boundary?
google is no good for me for this
thanks in advance
推荐答案
On Sun，2005年9月18日00:15:43 +0100，Singleton
< ku ***** @ homecall.co。 UK>在comp.lang.c ++中写道：
On Sun, 18 Sep 2005 00:15:43 +0100, "Singleton"
<ku*****@homecall.co.uk> wrote in comp.lang.c++:
有人可以指导我什么是单词边界吗？
谷歌对我来说对此没有好处
感谢提前
Can some one guide me what is word boundary?
google is no good for me for this
thanks in advance
是什么让你决定在这里提出这个问题？没有这样的术语
由C ++语言定义。
-
Jack Klein
主页： http://JK-Technology.Com
comp.lang.c的常见问题解答 http://www.eskimo.com/~scs/C-faq/top.html
comp.lang.c ++ http://www.parashift.com/c++-faq-lite/
alt.comp.lang.learn.c-c ++
http://www.contrib.andrew.cmu.edu/~a...FAQ-acllc.html
What made you decide to ask this question here? There is no such term
defined by the C++ language.
--
Jack Klein
Home: http://JK-Technology.Com
FAQs for
comp.lang.c http://www.eskimo.com/~scs/C-faq/top.html
comp.lang.c++ http://www.parashift.com/c++-faq-lite/
alt.comp.lang.learn.c-c++
http://www.contrib.andrew.cmu.edu/~a...FAQ-acllc.html
I刚刚在脑海中进行了c ++考试。其中一个问题是
问：）根据C ++标准，内存中的对象'内部
表示保证是什么？
选择1：连续
选择2：在筹码上
选择3：已初始化
选择4：在单词边界
选择5：在堆上
即使是一家公司的c ++技术测试之一也在询问相同的问题。
事实上在Google中有许多c ++网站在讨论单词
边界的问题。
希望你确信。
问候，
S
无知是幸福
" Jack Klein" < JA ******* @ spamcop.net>在消息中写道
news：fm ******************************** @ 4ax.com ...
I just took c++ exam in brainbnch . one of the question is
Q:)According to the C++ standard, what is an object''s internal
representation in memory guaranteed to be?
Choice 1 : Contiguous
Choice 2 : On the stack
Choice 3 : Initialized
Choice 4 : On a word boundary
Choice 5 : On the heap
Even one of the c++ technical test for a company was asking the same
question.
In fact in Google there are many c++ sites talking about problems with word
boundary.
hope you are convinced.
Regards,
S
ignorance is bliss
"Jack Klein" <ja*******@spamcop.net> wrote in message
news:fm********************************@4ax.com...
On Sun，2005年9月18日00:15:43 +0100，Singleton
< ku ***** @ homecall.co.uk>在comp.lang.c ++中写道：
On Sun, 18 Sep 2005 00:15:43 +0100, "Singleton"
<ku*****@homecall.co.uk> wrote in comp.lang.c++:
有人可以指导我什么是单词边界吗？
谷歌对我来说对此没有好处
感谢提前
Can some one guide me what is word boundary?
google is no good for me for this
thanks in advance
是什么让你决定在这里提出这个问题？没有这样的术语由C ++语言定义。
-
Jack Klein
主页： http://JK-Technology.Com
comp.lang.c的常见问题解答 http://www.eskimo.com/~scs/C-faq/top.html
comp.lang.c ++ http：// www。 parashift.com/c++-faq-lite/
alt.comp.lang.learn.c-c ++
http://www.contrib.andrew.cmu.edu/~a...FAQ-acllc.html
这取决于单词的大小。在今天的很多机器上，一个字是32美元b $ b位。这意味着在单词边界上的地址是
0
4
8
12
16
等......十年前左右b $ b一个字曾经是16（8086）位，之前是8位
很常见（6502,6800,6809）
通常使用处理器会有一点性能提升
原生大小。因此，使用32位和单词
边界上的内存地址可以更有效。比非32位-16位的存储器地址
甚至非32-非16位但是8位地址，即使后者更小，你也可能会因为速度慢而导致
使用这些大小和地址时的代码。在您的
代码中。
-
问候，Ron AF Greve
http://moonlit.xs4all.nl
" Singleton" <ク***** @ homecall.co.uk>在消息中写道
news：43 ********** @ mk-nntp-2.news.uk.tiscali.com ...
Hi,
It depends on how large a word is. On a lot of machines today a word is 32
bit. That means on a word boundary is at address
0
4
8
12
16
etc...
ten years ago or so a word used to be 16 (8086) bits and before that 8 bit
was common (6502, 6800, 6809)
Usually there is a bit of a performance gain working with the processors
native size. So using 32 bits and memory addresses that are on a word
boundary can be more efficient. than memory addresses at non-32 bit -16 bit
or even non 32- non- 16 but 8 bit addresses even the latter is smaller you
might end up with slower code when using those sizes and addresses . in your
code.
--
Regards, Ron AF Greve
http://moonlit.xs4all.nl
"Singleton" <ku*****@homecall.co.uk> wrote in message
news:43**********@mk-nntp-2.news.uk.tiscali.com...
Can有人指导我什么是单词边界？
谷歌对我来说没有好处
提前感谢
Can some one guide me what is word boundary?
google is no good for me for this
thanks in advance
这篇关于什么是单词边界？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
