Re: Clever UNIX/C Constructs -- RPG400-L



boldt@ca.ibm.com wrote:
> 
> This debate is still raging?!?

nah - more like simmering ;)
> 

> Actually, the listed price is $10.  But it probably should have been
> listed as $2.  I wouldn't say it's a "lunch-time diversion", but it's
> not much work at all.  In fact, I have it working already in my own
> development library!  The only work remaining is a diagnostic or two,
> and testing.  (Oh yeah, also writing up the description of the
> function.)
> 
> So the question of whether or not this should be implemented is, as
> far as I'm concerned, moot.
> 
> Also, it's not the same as ADD.  Using +=, you can code stuff like:
> 
>        string += ' ' + productCode;
>        total += cost + tax;
> 
> You can't do that with ADD.
> 

True - I was think about adding a single value - not multiple.  Of
course another good reason to use it.

> 
> And maintainability.  As others have pointed out, if you're
> incrementing some complex expression, it's easier to get it right
> if you only have to type it once.
> 
> Oh yeah, also performance.  Consider the statements:
> 
>       Totals(FindItem('xyz')) += incr;
>       Totals(FindItem('xyz')) = Totals(FindItem('xyz')) + incr;
> 
> One statement calls procedure FindItem once, the other twice.
> You just might find some use for this.
> 
> > Indicator logic may be a poor example since newer versions of RPG are
> >eliminating them.  But I would like to see some of the better features
> >of RPG added back into C
> 
> I'm curious - could you name some RPG things you'd like to see in C?
> (Besides, of course, better string manipulation.)

Well try writing a report program in c.  To do it right you will end up
with a library of functions to handle what is built into RPG.  Not that
a library of functions is a bad thing but each implementation of c will
handle printer output a little differently  (DIPLOMAC vs IBM c - both on
an AS400)

> 
> BTW, we're not eliminating indicators, just making them less
> necessary.
> 

Of course that is what I meant to say.

> Here's another take on this argument.  Much of what we've been doing
> to the language in the past few releases has been to relieve the
> programmer of having to deal with those existing quirks.  I would
> argue that a program written to take advantage of the V5R1 language
> would be much more maintainable than more traditional RPG programming
> style.
> 

I agree.  RPG IV is much easier for non RPG programmers to learn.  Using
%eof, %error etc is a hundred times clearer than using right hand
indicators on a read statement.

John Hall
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