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Top Forums Programming A trivial XOR doubt in a program Post 302247330 by jim mcnamara on Wednesday 15th of October 2008 12:05:00 PM
Old 10-15-2008
The short answer - it is an undefined operation. Means that the C standard regards this as garbage, and your compiler was polite enough to produce spaces.
The reason: there are no sequence points in the line between important steps.

A ; character creates a sequence point. So the first version works. This means the compiler can do any of those calculations in any order...

By the way, that 'swap' algorithm in general is a bad idea; it has unsafe properties. You should use a temp variable. It may look cool to you, but that is about it.
 

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dxuil(1X)																 dxuil(1X)

Name
       dxuil - user interface language compiler for X window system

Syntax
       dxuil [ options ] file

Arguments
       file		   Specifies the file to be compiled through the UIL compiler.

Description
       The  dxuil  command invokes the UIL compiler.  The XUI User Interface Language (UIL) is a specification language for describing the initial
       state of a user interface for an XUI application.  The specification describes the objects (menus, dialog boxes, labels, push buttons,  and
       so on) used in the interface and specifies the routines to be called when the interface changes state as a result of user interaction.

       For more information about the UIL compiler, see the Guide to the XUI User Interface Language Compiler.

Options
       -Ipathname	   Specify this option followed by a pathname, with no intervening spaces, to locate include files when the include direc-
			   tive is used.  This option causes the compiler to look for include files in the  directory  specified  if  the  include
			   files have not been found in the paths that have already been searched.

       -m		   Machine  code  is  listed.  This directs the compiler to place in the listing file a description of the records that it
			   added to the UID database.  This helps you isolate errors.  The default is no machine code.

       -o file		   Directs the compiler to produce a user interface database (UID).  By default, UIL creates a UID with  the  name  a.uid.
			   The	file  specifies  the filename for the UID.  No UID will be produced if the compiler issues any diagnostics catego-
			   rized as error or severe.

       -v file		   Directs the compiler to generate a listing.	The file specifies the filename for the listing.  If the -v option is  not
			   present, no listing is generated by the compiler.  The default is no listing.

       -w		   Specifies  that  the compiler suppress all warning and informational messages.  If this option is not present, all mes-
			   sages will be generated, regardless of the severity.

See Also
       X(1X)
       Guide to the XUI User Interface Language Compiler

																	 dxuil(1X)
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