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From: allebrandi@inland.com (Tom Allebrandi)
Newsgroups: comp.os.msdos.programmer
Subject: Re: #define thisneatmacro
Message-ID: <159.271eb448@inland.com>
Date: 19 Oct 90 08:07:36 GMT
References: <9286@helios.TAMU.EDU>
Organization: Inland Steel Research Labs; East Chicago, IN
Lines: 42

In article <9286@helios.TAMU.EDU>, ctl8588@rigel.tamu.edu (LAUGHLIN, CHET) writes:
> I tried useing the following macro, with some success...
> 
> #define drawch(A,B,C)  {gotoxy(A,B); cput(C);}
> 
> however, the following code won't work...compiler doesn't like
> the extra ; at the end of drawch...
> 
> if (cond)
>    drawch(x,y,ch);
> else
>    printf("ICK!\n");
> 

Think about what you are telling the compiler. What you have typed above
is exactly equivalent to

	if (cond)
	   {gotoxy(A,B); cput(C);};	(1)
	else
	   printf("ICK!\n");

The way I read the language definition in K&R, line (1) is not legal
syntax. However, this is legal:

	   {{gotoxy(A,B); cput(C);};}

meaning that you should do this:

	if (cond)
	  {drawch(x,y,ch);}
	 ... 

Another approach would be to define your macro as

	#define drawch(A,B,C)  gotoxy(A,B), cput(C)

--- Tom
Tom Allebrandi             | Vice-char and mail guru, VMSnet WG, DECUS VAX SIG
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