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From: fisher@sc2a.unige.ch (Markus Fischer)
Newsgroups: comp.os.msdos.programmer
Subject: Re: #define thisneatmacro
Message-ID: <275@sc2a.unige.ch>
Date: 19 Oct 90 15:38:08 GMT
References: <9286@helios.TAMU.EDU>
Organization: University of Geneva, Switzerland
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");
> 
> Any ideas out there?

If you really want it, try one of the following:

#define drawch(A,B,C)   do { gotoxy((A),(B)); cput(C); } while(0)
#define drawch(A,B,C)   gotoxy((A),(B)), cput(C)
#define drawch(A,B,C)   cputc(( gotoxy((A),(B)), (C) ))

whichever you like.

All four (your's included) follow the general rule for lowercase macros,
which is to use every parameter exaclty once.  Thus

	drawch( col++, row, *(string++) );

works as expected.

The last one is neat, it reads: call function cputc with parameter
"( evaluate gotoxy, with params A and B, drop the return value, use C )",
and keep return value of cputc for future use.  ( In fact the equivalent
`putch' of TC returns nothing... )

Enjoy

Markus Fischer, Dpt. of Anthopology, Geneva.