Re: simple questions-cannot find answers in common books

["R. Bruce Hoffman, Jr." <rbruceh@xxxxxxx>]

christopher sagayam wrote:

> in rpg programming
>
> 1.in form type I what is the use of SEQUENCE  eg.AA etc
>

This goes back to RPG II where multiple record types (formats) where in a flat
file and processed in a certain order.  Unless you have to maintain old code,
don't worry, be happy.  If you have to maintain old code, you might just want to
leave it alone.

> 2.how are indicators U0-U9,MR used.
>

U0 through U9 are external switch indicators.  On the AS/400 you alter them on 
or
off with either another program or use the CL command CHGJOB with the SWS
parameter.  (I think its the SWS or maybe SWITCH, I forget.)

MR is beyond the scope of e-mail.  Matching record indicator.  Used with M1
through M9 to build match fields between two or more files.  Causes the files to
be merged in a "keyed" order according to rules for M1 through M9.  Usefull, but
many people avoid it.  Again, it comes from the orginal RPG specs.  Many 
consider
it "antiquated".

> 3.is there any way i can try out RPG programs using internet ie
> downloading or etc.
>

Downloads of RPG are somewhat hard to find on the internet.  But you still need 
a
compiler to truely learn.

> 4.can a subfile be used to access data from different physical files if
> so how can an update pgm work on different physical files.
>

I am not sure, but I think you have the wrong impression of a subfile.  A 
subfile
allows multiple records of your own design to be displayed on a screen at one
time.  Handling of rollup and rolldown keys is supported and the programmer does
not have to do a whole lot of coding to make this "screen magic" happen.  So if
you read multiple files and populate the subfile and then display it...  it
happens.

b.

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--
===========================================================
R. Bruce Hoffman, Jr. -- IBM Certified AS/400 Administrator

-- The sum of all human knowledge is a fixed constant.
    It's the population that keeps growing!


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