变量声明：位置 [英] Declaration of Variables: Location
问题描述
当我今天浏览一个教程的时候，我遇到了一个信息
，标准C变量必须在
块的开头处进行decalred。含义：
/ *********************************** *************** ** /
/ * ...通常包含和* /
int var = 1;
if（var = 1）{
printf（" hello world \ n"）;
}
int a = 10;
int b = 30;
printf（"％d％d"， a，b）;
/ *结束归还等。* /
/ ******************** ****************************** ** /
会形成某种形式错误，需要更换为：
/ ******************************** ****************** ** /
/ * ...通常包括和* /
int var = 1;
if（var = 1）{
printf（" hello world \ n"）;
}
{
int a = 10;
int b = 30;
printf（"％d ％d，a，b）;
}
/ *结束返回等。* /
/ ******* ******************************************* ** /
这对我来说是新闻，因为我从未听过或看到过这样的事情。
事实上，我已经假设（但从未确认）C甚至是
装备具有裸露块特征。任何人都可以提供任何洞察力
到这里发生的事情。另外请纠正我，如果我已经错误地预测了我可能有的东西。
Nori
Whilest I was browesing a tutorial today I came across the infromation
that in standard C variables must be decalred at the beginning of a
block. Meaning:
/************************************************** **/
/* ... usual includes and such */
int var = 1;
if(var = 1){
printf("hello world\n");
}
int a = 10;
int b = 30;
printf("%d %d", a, b);
/* end return etc. */
/************************************************** **/
Would form some kind of error and would need to be replaced with:
/************************************************** **/
/* ... usual includes and such */
int var = 1;
if(var = 1){
printf("hello world\n");
}
{
int a = 10;
int b = 30;
printf("%d %d", a, b);
}
/* end return etc. */
/************************************************** **/
This is news to me as I have never heard or seen anything like this.
Infact I have assumed (but have never confirmed) that C was even
equiped with a "naked block" feature. Can anyone offer any insight as
to what is going on here. Also please correct me if I have
misinturpreted someting as I expect that I might have.
Nori
推荐答案
no*********@gmail.com 写道：
当我今天浏览一个教程时，我遇到了这样的信息，即在标准C变量中必须在
块的开头处进行十字转换。
Whilest I was browesing a tutorial today I came across the infromation
that in standard C variables must be decalred at the beginning of a
block.
对于C99之前的代码是真的，在C99中修复。
-
Ian Collins。
True for pre C99 code, fixed in C99.
--
Ian Collins.
这是旧的sytle c ....现在c可以处理任何地方的
变量的声明，只要它只在那之后被引用点。
标准比大多数编译器接受的标准更严格（包括gcc
）。如果你想要严格使用
gcc -pedantic ...
This is the old sytle c....now c can handle the declaration of a
variable any where, as long as it is only referenced after that point.
The standard is more strict than what most compilers accept(gcc
included). If you want strict use
gcc -pedantic ...
Ian Collins写道：
Ian Collins wrote:
no*********@gmail.com 写道：
当我今天浏览一个教程时，我遇到了这样的信息，即在标准C变量中必须在
块的开头处进行十字转换。
Whilest I was browesing a tutorial today I came across the infromation
that in standard C variables must be decalred at the beginning of a
block.
对于预C99代码为真，在C99中修复。
True for pre C99 code, fixed in C99.
我想指出代码更容易阅读如果所有的
变量声明位于每个块的顶部。它还允许你
轻松查看什么是和不在范围内，假设你缩进每一层
到块。
Of当然，这只是我的偏好。
-
Andrew Poelstra< http：//www.wpsoftware.net/blog>
系列中的每个素数作为一个笑话
当我拿到最后一个toke时使所有模式清晰
- 数字（沉没复杂性）
I''d like to point out that code is far easier to read if all the
variable declarations are at the top of each block. It also allows you
to easily see what is and isn''t in scope, assuming you indent each layer
to blocks.
Of course, that is just a preference of mine.
--
Andrew Poelstra <http://www.wpsoftware.net/blog>
Every prime number in a series as a joke
Made all the patterns clear when I took that final toke
-- Numbers (Sunken Complexity)
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