confuse of using define preprocessor directive

Index > Macroinstructions > confuse of using define preprocessor directive

Author

Thread

primer

Joined: 05 Nov 2010
Posts: 12

primer 16 Nov 2010, 13:28

Hi all!
I'm confusing of using define, I've added this code to win32ax.inc

Code:

if defined CRT
 display "CRT defined",13,10
       display CRT,13,10
else
   define CRT 'msvcrt.dll'
   display "use default CRT",13,10
   display CRT,13,10
end if

and in my program

Code:

format PE console
define CRT 'msvcr100.dll'
include 'win32ax.inc'
display CRT
.code
start:
        invoke ExitProcess,0
.end start

and it print in compile console

Code:

flat assembler  version 1.69.25  (1229413 kilobytes memory)
CRT defined
msvcr100.dll
msvcrt.dll
3 passes, 0.1 seconds, 2048 bytes.

so I don't know why it set CRT to msvcrt.dll?

16 Nov 2010, 13:28

bitRAKE

Joined: 21 Jul 2003
Posts: 4227
Location: vpcmpistri

bitRAKE 16 Nov 2010, 14:07

DEFINE is handled by the preprocessor before code is processed by assembler. IF/ELSE are handled by assembler. This separation between preprocessor and assembler is most important -- like two completely different languages -- like using PHP to generate content for browser.

16 Nov 2010, 14:07

primer

Joined: 05 Nov 2010
Posts: 12

primer 16 Nov 2010, 15:45

bitRAKE wrote:

DEFINE is handled by the preprocessor before code is processed by assembler. IF/ELSE are handled by assembler. This separation between preprocessor and assembler is most important -- like two completely different languages -- like using PHP to generate content for browser.

understood Smile

, thank you.

16 Nov 2010, 15:45

JohnFound

Joined: 16 Jun 2003
Posts: 3499
Location: Bulgaria

JohnFound 16 Nov 2010, 17:06

But we have to admit, that using "define" and "defined" in such different meanings is somehow confusing for beginners... Smile

16 Nov 2010, 17:06

< Last Thread | Next Thread >

Forum Rules:

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum