Re: [Sdcc-user] Binary constants?

[Jesus Calvino-F. <Je...@ec...>]

Hi,

As far as I know binary constants are not supported in C.  Many years ago 
when I switched from PLM to C that was the only think I really 
missed...  Anyhow, the work around I use for 8 bit numbers is to define 
each one of them in an include file.  The file can be created with a simple 
program like:

--- cut here ---
#include <stdio.h>

void main (void)
{
         char binnum[9]="00000000";
         int i, j, mask;

         for(j=0; j<256; j++)
         {
                 for(i=0, mask=0x80; i<8; i++)
                 {
                         binnum[i]=(mask&j)?'1':'0';
                         mask/=2;
                 }
                 printf("#define B%s (0x%02x)\n", binnum, j);
         }
}
--- cut here ---

Suppose the previous file creates an executable called 'binconst.exe'.  The 
include file can be created by executing:

binconst > binnums.h

'binnums.h' should look like:

#define B00000000 (0x00)
#define B00000001 (0x01)
#define B00000010 (0x02)
.
.
.
#define B11111110 (0xfe)
#define B11111111 (0xff)

Just #include "binnums.h" into your program and use the binary constants 
you need...

At 01:03 PM 7/30/02 -0700, Erik Walthinsen wrote:
>After spending the last week learning PIC programming from scratch with
>asm while working up to a complete development environment that doesn't
>suck (webpage with docs, code, tips & tricks coming soon), I've gotten
>somewhat used to having binary constants, i.e. b'01001110'.  A search
>through the entire sdcc source tree doesn't reveal any obvious way to use
>such constants in C.  Am I missing something, or is that indeed a feature
>that hasn't been implemented?  If so, what would it take to add them?
>
>TIA,
>    Omega
>
>       Erik Walthinsen <om...@te...> - System Administrator
>         __
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