在“for”中声明的int var不是本地人？ [英] int var declared in "for" not local?

问题描述

我的代码出现了一个奇怪的错误：


...

案例WM_COMMAND：

{

开关（LOWORD（wParam））//开关（控制ID）

{

...

case IDC_RAIN_ENABLE_SIMPLE：

{

if（BN_CLICKED == HIWORD（wParam））

{

for（int i = 0; i< 11; + i）

{

ShowWindow（GetDlgItem（hDlg，RainControls [i]），SW_SHOW）;

}


for（int i = 11; i< 25; + i）// !!!错误!!!错误!!!

错误!!!

{

ShowWindow（GetDlgItem（hDlg，RainControls [i]），SW_HIDE）;

}

}

休息;

}

...

休息;

}

...

休息;

}

...

休息;

...

我的编译器在工作中（MS VC ++ 6.0）标记在标记的行

" ERROR"以上。它说这是一个重新定义。我的。

怎么会这样？对于每个声明，我不是我的本地人吗？并不是
0到10的结束大括号。声明使我

超出范围？因此，在下一个声明中定义一个新的i

应该是完全可以的，不应该吗？


我在这里遗漏了什么，或者这是MS VC ++ 6.0中的一个错误？


-

困惑，

Robbie Hatley

孤独在pac bell dot net的狼intj

解决方案

Robbie Hatley写道：

我'这个代码出现了一个奇怪的错误：

......
案例WM_COMMAND：
{
开关（LOWORD（wParam））//开关（控件ID ）
{
...
案件IDC_RAIN_ENABLE_SIMPLE：
{
if（BN_CLICKED == HIWORD（wParam））
{
for（ int i = 0; i< 11; + i）
{ShowWindow（GetDlgItem（hDlg，RainControls [i]），SW_SHOW）;
}

FO r（int i = 11;我< 25; + i）// !!!错误!!!错误!!!
错误!!!
{ShowWindow（GetDlgItem（hDlg，RainControls [i]），SW_HIDE）;
}
}
休息;
}
...休息;
}
...
休息;
}
...
打破;
...

我的编译器在工作中（MS VC ++ 6.0）标记为错误的行。以上。它说这是一个重新定义。我是怎么回事？对于每个声明，我不是我的本地人吗？并不是0到10的结束大括号。声明使我
超出范围？所以在下一个声明中定义一个新的我应该是完全没问题的，不应该吗？

我在这里遗漏了什么，或者这是MS VC ++ 6.0中的一个错误？

它在VC ++ 6中是不可靠的。他们的标准解决方案是将

升级到VC.NET，这可能很昂贵或者否则，不需要，在一组花括号中包装

，这是丑陋的，或使用宏：


#define for if（0 ）;否则为


干杯！ --M

" mlimber" <毫升***** @ gmail.com>在消息中写道


新闻：11 ********************* @ g43g2000cwa.googlegro ups.com ... < [...] ; ERROR"以上。它说这是一个重新定义。我是怎么回事？对于每个声明，我不是我的本地人吗？ ...

它在VC ++ 6中是不可靠的。

我明白了！谢谢（你的）信息。看起来MS正在处理

var。 decls。对于parens。如果我没记错的话就像C的一些旧的一样，如果我没记错的话。

（这不就是K& RC这样做的吗？）我'' ll只需要

记住我的范围是封闭的封锁

for语句。


我想的方式我会处理就是这样：


case BLAT：

{

int i;

for（i = 0; i< 11; ++ i）

{

DoSomeStuff（Splat [i]）;

}

for（i = 11; i< 25; ++ i）

{

DoOtherStuff（Splat [i]）;

}

休息;

}


是的，有效。


-

干杯！

Robbie Hatley

孤独的狼inj at pac bell dot net

mlimber< ml ***** @ gmail.com>写道：

Robbie Hatley写道：

for（int i = 0; i< 11; + i）

ShowWindow（GetDlgItem（hDlg，RainControls [i]），SW_SHOW）;
}
for（int i = 11; i< 25; + i）// !!!错误!!!错误!!!
错误!!!
{ShowWindow（GetDlgItem（hDlg，RainControls [i]），SW_HIDE）;
}

我的这里的编译器（MS VC ++ 6.0）在标记为ERROR的行上标记为ERROR。以上。它说这是一个重新定义。我是怎么回事？对于每个声明，我不是我的本地人吗？并不是0到10的结束大括号。声明使我
超出范围？所以在下一个声明中定义一个新的我应该是完全没问题的，不应该吗？

我在这里遗漏了什么，或者这是MS VC ++ 6.0中的一个错误？

这是VC ++ 6中的不合规。他们的标准解决方案是升级到VC.NET，这可能是昂贵的或其他不合需要的，以包装对于一组花括号中的循环，这是丑陋的，或使用宏：

#define为if（0）;否则为

此外，即使使用VC.NET 2003，您也必须将命令行选项

传递给编译器以强制执行此规则：


/ Zc： arg1 [，arg2] C ++语言一致性，其中参数可以是：

forScope - 为范围规则强制执行标准C ++

wchar_t - wchar_t是本机类型，而不是typedef


-

Marcus Kwok

I''m getting a bizarre error with this code:

...
case WM_COMMAND:
{
switch (LOWORD(wParam)) // switch (control ID)
{
...
case IDC_RAIN_ENABLE_SIMPLE:
{
if (BN_CLICKED == HIWORD(wParam))
{
for ( int i = 0 ; i < 11 ; +i)
{
ShowWindow(GetDlgItem(hDlg, RainControls[i]), SW_SHOW);
}

for ( int i = 11 ; i < 25 ; +i) // !!! ERROR !!! ERROR !!!
ERROR !!!
{
ShowWindow(GetDlgItem(hDlg, RainControls[i]), SW_HIDE);
}
}
break;
}
...
break;
}
...
break;
}
...
break;
...
My compiler here at work (MS VC++ 6.0) balks at the line marked
"ERROR" above. It says this is a "redefinition" of i .
How can this be? Isn''t i local to each for statement? Doesn''t
the closing curly brace of the "0 to 10" for statement make i
go out of scope? So defining a new i in the next for statement
should be perfectly ok, shouldn''t it?

Am I missing something here, or is this a bug in MS VC++ 6.0?

--
Puzzled,
Robbie Hatley
lone wolf intj at pac bell dot net

解决方案

Robbie Hatley wrote:

I''m getting a bizarre error with this code:

...
case WM_COMMAND:
{
switch (LOWORD(wParam)) // switch (control ID)
{
...
case IDC_RAIN_ENABLE_SIMPLE:
{
if (BN_CLICKED == HIWORD(wParam))
{
for ( int i = 0 ; i < 11 ; +i)
{
ShowWindow(GetDlgItem(hDlg, RainControls[i]), SW_SHOW);
}

for ( int i = 11 ; i < 25 ; +i) // !!! ERROR !!! ERROR !!!
ERROR !!!
{
ShowWindow(GetDlgItem(hDlg, RainControls[i]), SW_HIDE);
}
}
break;
}
...
break;
}
...
break;
}
...
break;
...
My compiler here at work (MS VC++ 6.0) balks at the line marked
"ERROR" above. It says this is a "redefinition" of i .
How can this be? Isn''t i local to each for statement? Doesn''t
the closing curly brace of the "0 to 10" for statement make i
go out of scope? So defining a new i in the next for statement
should be perfectly ok, shouldn''t it?

Am I missing something here, or is this a bug in MS VC++ 6.0?

It''s a non-conformancy in VC++ 6. Their standard solution is to upgrade
to VC.NET, which might be expensive or otherwise undesirable, to wrap
for loops in a set of curly braces, which is ugly, or to use a macro:

#define for if(0);else for

Cheers! --M

"mlimber" <ml*****@gmail.com> wrote in message

news:11*********************@g43g2000cwa.googlegro ups.com...

Robbie Hatley wrote:

...
My compiler here at work (MS VC++ 6.0) balks at the line marked
"ERROR" above. It says this is a "redefinition" of i .
How can this be? Isn''t i local to each for statement? ...

It''s a non-conformancy in VC++ 6.

I see! Thanks for the info. Looks like MS is handling
var. decls. in for parens. the same way as some old
implimentations of C did, if I remember correctly.
(Wasn''t this the way K&R C did it?) I''ll just have to
remember that the scope of i is the block ENCLOSING
the for statement.

I think the way I''ll handle that is like so:

case BLAT:
{
int i;
for ( i = 0; i < 11; ++i )
{
DoSomeStuff(Splat[i]);
}
for ( i = 11; i < 25; ++i )
{
DoOtherStuff(Splat[i]);
}
break;
}

Yes, that works.

--
Cheers!
Robbie Hatley
lone wolf intj at pac bell dot net

mlimber <ml*****@gmail.com> wrote:

Robbie Hatley wrote:

for ( int i = 0 ; i < 11 ; +i)
{
ShowWindow(GetDlgItem(hDlg, RainControls[i]), SW_SHOW);
}

for ( int i = 11 ; i < 25 ; +i) // !!! ERROR !!! ERROR !!!
ERROR !!!
{
ShowWindow(GetDlgItem(hDlg, RainControls[i]), SW_HIDE);
}

My compiler here at work (MS VC++ 6.0) balks at the line marked
"ERROR" above. It says this is a "redefinition" of i .
How can this be? Isn''t i local to each for statement? Doesn''t
the closing curly brace of the "0 to 10" for statement make i
go out of scope? So defining a new i in the next for statement
should be perfectly ok, shouldn''t it?

Am I missing something here, or is this a bug in MS VC++ 6.0?

It''s a non-conformancy in VC++ 6. Their standard solution is to upgrade
to VC.NET, which might be expensive or otherwise undesirable, to wrap
for loops in a set of curly braces, which is ugly, or to use a macro:

#define for if(0);else for

Additionally, even with VC.NET 2003, you must pass a commandline option
to the compiler to enforce this rule:

/Zc:arg1[,arg2] C++ language conformance, where arguments can be:
forScope - enforce Standard C++ for scoping rules
wchar_t - wchar_t is the native type, not a typedef

--
Marcus Kwok

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