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List Info
Thread: error C2065: 'true' : undeclared identifier
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| error C2065: 'true' : undeclared
identifier |
 
United States |
2007-03-05 11:19:17 |
|
I thought I knew c++ pretty well, but I'm beginning to have some serious doubts.
I found some 'c' code I wanted to try out. (It was written for Linux, but that's not relevant.) In VS2005, I created a new console app project, and added the files I had downloaded. With a few minor tweaks, the program builds and runs. One place in the code, an 'int' variable was used for a boolean concept. I changed the variable to a bool, and fixed all references to it. That's about when I must have lost my mind. I rebuilt the project, and the line: ;
bool ; bWait = true;
produced the following errors:
Error ; 1 error C2061: syntax error : identifier 'bWait' c:...main.c 30
Error ; 2 error C2059: syntax error : ';'
c:...main.c 30
Error ; 3 error C2513: '/*global*/ ' : no variable declared before '=' c:...main.c 30
Error ; 4 error C2065: 'true' : undeclared identifier ; c:...main.c 30
I double-checked my properties to ensure I was building as a c++ project.
What do you do when your c++ compiler doesn't recognize 'true'? (or 'false', or 'bool'?)
Somebody, please, just shoot me!
Jeff Nygren
 
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| Re: error C2065: 'true' : undeclared
identifier |
United States |
2007-03-05 12:07:10 |
|
At 3/5/2007 12:19 PM, J Nygren wrote:
bool bWait = true;
produced the following errors:
It sounds like you didn't include the standard Microsoft header
files.
The stdafx.h should have something like:
// stdafx.h :
include file for standard system include files,
// or project specific include files that are used frequently,
but
// ; are changed infrequently
//
#ifndef
WINVER
#define
WINVER
0x0500
#endif
#define
VC_EXTRALEAN
// Exclude
rarely-used stuff from Windows headers
#include
<afxwin.h>
// MFC core
and standard components
#include
<afxext.h>
// MFC
extensions
#include
<afxhtml.h>
// MFC html
support
#ifndef
_AFX_NO_OLE_SUPPORT
#include
<afxole.h>
// MFC OLE
classes
#include
<afxodlgs.h>
// MFC OLE
dialog classes
#include
<afxdisp.h>
// MFC OLE
automation classes
#endif
//
_AFX_NO_OLE_SUPPORT
#ifndef
_AFX_NO_DB_SUPPORT
#include
<afxdb.h>
// MFC ODBC
database classes
#endif
//
_AFX_NO_DB_SUPPORT
#ifndef
_AFX_NO_DAO_SUPPORT
#include
<afxdao.h>
// MFC DAO
database classes
#endif
//
_AFX_NO_DAO_SUPPORT
#ifndef
_AFX_NO_AFXCMN_SUPPORT
#include
<afxcmn.h>
// MFC
support for Windows 95 Common Controls
#endif
//
_AFX_NO_AFXCMN_SUPPORT
Phil Daley ; <
AutoDesk >
http://www.conknet.com/~p_daley
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|
| Re: error C2065: 'true' : undeclared
identifier |
 
Iran, Islamic Republic of |
2007-03-05 21:42:04 |
J Nygren wrote:
> I thought I knew c++ pretty well, but I'm beginning to
have some serious
> doubts.
>
> I found some 'c' code I wanted to try out. (It was
written for Linux,
> but that's not relevant.) In VS2005, I created a new
console app
> project, and added the files I had downloaded. With a
few minor tweaks,
> the program builds and runs. One place in the code, an
'int' variable
> was used for a boolean concept. I changed the variable
to a bool, and
> fixed all references to it. That's about when I must
have lost my mind.
> I rebuilt the project, and the line:
>
> bool bWait = true;
>
> produced the following errors:
>
> Error 1 error C2061: syntax error :
identifier 'bWait'
> c:...main.c 30
> Error 2 error C2059: syntax error : ';'
> c:...main.c 30
> Error 3 error C2513: '/*global*/ ' : no
variable declared
> before '=' c:...main.c 30
> Error 4 error C2065: 'true' : undeclared
identifier
> c:...main.c 30
>
> I double-checked my properties to ensure I was building
as a c++ project.
>
> What do you do when your c++ compiler doesn't recognize
'true'? (or
> 'false', or 'bool'?)
It's not the C++ compiler, it's the C compiler. See, C
doesn't have the
bool type, and it doesn't also have the true and false
keywords.
Changing the file extension to .cpp (to invoke the C++
compiler on it)
will probably solve this issue (unless there's some C code
elsewhere
which is not valid C++.) If you need to keep it a C file,
then switch
bool with traditional int type used for Boolean values.
Ehsan
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|
|
| Re: error C2065: 'true' : undeclared
identifier |
|
2007-03-06 22:01:37 |
|
Nice catch, Ehsan -- so mystifying at first, so obvious when solved... 
-cleo
On 3/5/07, Ehsan Akhgari < ehsan beginthread.com">
ehsanbeginthread.com> wrote:J Nygren wrote:
>; I thought I knew c++ pretty well, but I'm beginning to have some serious
> doubts.
>
> I found some 'c'; code I wanted to try out. (It was written for Linux,
>; but that's not relevant.) In VS2005, I created a new console app
> project, and added the files I had downloaded. With a few minor tweaks,
> the program builds and runs. One place in the code, an 'int' variable
> was used for a boolean concept. I changed the variable to a bool, and
> fixed all references to it. That's about when I must have lost my mind.
> I rebuilt the project, and the line:
>
> ; bool ; bWait = true;
>
> produced the following errors:
>
> Error ; 1 error C2061: syntax error : identifier 'bWait'
>; c:...main.c 30
> ; Error ; 2 error C2059: syntax error : ';';
> c:...main.c 30
> ; Error ; 3 error C2513: '/*global*/ ' : no variable declared
> before '='; c:...main.c 30
> Error ; 4 error C2065: 'true' : undeclared identifier
> c:...main.c 30
>
> I double-checked my properties to ensure I was building as a c++ project.
>
> What do you do when your c++ compiler doesn't recognize 'true'? (or
> 'false', or 'bool'?)
It's not the C++ compiler, it's the C compiler. See, C doesn't have the
bool type, and it doesn't also have the true and false keywords.
Changing the file extension to .cpp (to invoke the C++ compiler on it)
will probably solve this issue (unless there's some C code elsewhere
which is not valid C++.) ; If you need to keep it a C file, then switch
bool with traditional int type used for Boolean values.
Ehsan
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