代码片段的“可比性”（来自“代码完整”一书） [英] `Comparability' of code snippets (from book `Code complete')
问题描述
完成代码一书提到了类似的代码片段，分别是
，并分别讨论了它们的优点。
但我认为这些代码片段在逻辑上是完全不同的，并且它们的功能是不同的。他们没有可比性。
我是对的吗？
/ *代码1 * /
for（i = 0; i< ; N; i ++）{
if（cond）
DoSomething（）;
else
DoOtherthing（） ;
}
/ * code 2 * /
if（cond）{
for （i = 0; i< N; i ++）
DoSomething（）;
} else {
for（i = 0; i < N; i ++）
DoOtherthing（）;
}
The book `Code complete'' mentions similar code snippets as the
followings , and talks about their advantages respectively.
But I think these code snippets are totally different in logic, and
their functionalities are different. They don''t have comparabilities.
Am I right?
/*code 1*/
for (i = 0; i < N; i++){
if (cond)
DoSomething();
else
DoOtherthing();
}
/*code 2*/
if (cond){
for (i = 0; i < N; i++)
DoSomething();
} else {
for (i = 0; i < N; i++)
DoOtherthing();
}
推荐答案
lovecreatesbea。 .. @ gmail.com说：
lovecreatesbea...@gmail.com said:
完成代码一书提到类似的代码片段如下
，并谈及分别是他们的优势。
但我认为这些代码片段的逻辑完全不同，而且他们的功能是不同的。他们没有可比性。
我是对的吗？
The book `Code complete'' mentions similar code snippets as the
followings , and talks about their advantages respectively.
But I think these code snippets are totally different in logic, and
their functionalities are different. They don''t have comparabilities.
Am I right?
这取决于未显示的细节。
-
Richard Heathfield< ; http：//www.cpax.org.uk>
电子邮件：-http：// www。 + rjh @
谷歌用户：< http://www.cpax.org.uk/prg/writings/googly.php>
Usenet是一个奇怪的放置" - dmr 1999年7月29日
It depends on details that are not shown.
--
Richard Heathfield <http://www.cpax.org.uk>
Email: -http://www. +rjh@
Google users: <http://www.cpax.org.uk/prg/writings/googly.php>
"Usenet is a strange place" - dmr 29 July 1999
" lovecreatesbea ... @ gmail.com" < lo *************** @ gmail.comwrote in message
news：d0 *************** ******************* @ s36g2000 prg.googlegroups.com ...
"lovecreatesbea...@gmail.com" <lo***************@gmail.comwrote in message
news:d0**********************************@s36g2000 prg.googlegroups.com...
书籍`代码完整''提到了类似的代码片段，分别是关于他们的优点。
但我认为这些代码片段的逻辑完全不同，
他们的功能是不同的。他们没有可比性。
我是对的吗？
/ *代码1 * /
for（i = 0; i< N; i ++）{
if（cond）
DoSomething（）;
else
DoOtherthing（）;
}
/ * code 2 * /
if（cond）{
for（i = 0; i< N; i ++）
DoSomething（）;
} else {
for（i = 0; i< N; i ++）
DoOtherthing（）;
}
The book `Code complete'' mentions similar code snippets as the
followings , and talks about their advantages respectively.
But I think these code snippets are totally different in logic, and
their functionalities are different. They don''t have comparabilities.
Am I right?
/*code 1*/
for (i = 0; i < N; i++){
if (cond)
DoSomething();
else
DoOtherthing();
}
/*code 2*/
if (cond){
for (i = 0; i < N; i++)
DoSomething();
} else {
for (i = 0; i < N; i++)
DoOtherthing();
}
假设没有尝试要改变cond，i或N中的函数，它们应该具有完全相同的效果。
问题是哪个更有效，哪个是更好的风格。
-
免费游戏和编程好东西。
http://www.personal.leeds.ac.uk/~bgy1mm
Assuming no attempt to alter cond, i or N in the functions, they should have
exactly the same effect.
The question is which is more efficient, and which is better style.
--
Free games and programming goodies.
http://www.personal.leeds.ac.uk/~bgy1mm
lovecreatesbea ... @ gmail.com写道：
lovecreatesbea...@gmail.com wrote:
完整代码一书提到了类似的代码片段，分别是
，并分别讨论了它们的优点。
但是我认为这些代码片段在逻辑上是完全不同的，并且它们的功能是不同的。他们没有可比性。
我是对的吗？
/ *代码1 * /
for（i = 0; i< N; i ++）{
if（cond）
DoSomething（）;
else
DoOtherthing（）;
}
/ * code 2 * /
if（cond）{
for（i = 0; i< N; i ++）
DoSomething（）;
} else {
for（i = 0; i< N; i ++）
DoOtherthing（）;
}
The book `Code complete'' mentions similar code snippets as the
followings , and talks about their advantages respectively.
But I think these code snippets are totally different in logic, and
their functionalities are different. They don''t have comparabilities.
Am I right?
/*code 1*/
for (i = 0; i < N; i++){
if (cond)
DoSomething();
else
DoOtherthing();
}
/*code 2*/
if (cond){
for (i = 0; i < N; i++)
DoSomething();
} else {
for (i = 0; i < N; i++)
DoOtherthing();
}
既不提供DoSomething （）也没有DoNothing（）改变cond
或i的值，它们是相同的，一个好的优化编译器应该能够生成相同的机器码。
Provided neither DoSomething() nor DoNothing() alter the value of cond
or i, they''re identical, and a good optimising compiler should be able
to generate the same machinecode.
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