Re: A Blast from the Past

My home grown version of CRTMIPGM allows a %INCLUDE directive to pull in 
standardized common MI
routines and a conditional pair of bracketing %IFDEF and %END which optionally 
includes code based on
comparison with a parameter on the command.  This was useful for MI differences 
between S/38 and
AS400.  Depth of nesting allows %INCLUDEs within %INCLUDEs to the second level.

Jim Langston wrote:

> Just a comment on the 2nd type.
>
> If MI follows C, then they are not quite the same.
>
> #Define NAMED-CONSTANT = 'ANYTHING'
> When you use that in your program, the compiler will replace NAMED-CONSTANT 
>with 'ANYTHING'.
>
> DD  CON  NAMED-CONSTANT  CHAR(10)  INIT('ANYTHING');
> When you use that in your program, the compiler will the address of the 
>constant.
>
> The main difference being that the #Define uses the object stack.  The CON 
>uses the program stack.
>
> That's how it would work in C, anyway.  It may actually work different in MI.
>
> Regards,
>
> Jim Langston
>
> -----Original Message-----
> From: Richard Hart [mailto:rhart@ATCDG.COM]
>
> About two kinds of macros:
>
> (1)  complicated ones
> (2)  simple ones (as:  %Define CARRIAGE-RETURN = X'0D'  /* In Ascii */
>
> The second kind is really just a named constant, right?  I guess we have the
>
>                 DD  CON  NAMED-CONSTANT  CHAR(10)  INIT('ANYTHING');
>
> Definition type for that.
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