Re: RPG/400 pgm strange behavior

[Douglas Handy <dhandy1@xxxxxxxxxxxxx>]

Richard,

>Are the RPG prototypes "externally described" 

I typically use /COPY members for prototypes, so in a sense you could
call them "externally described".

>or could I create a program
>with a wrong prototype, compile it successfully, the run the program and
>cause a failure?

Granted, if you created a prototype using ExtPgm and defined the
parameters wrong then used a CALLP consistent with the prototype (but
not consistent with what the program expected), then you're back to
the same potential problem and memory corruption.

However, /COPY prototypes can be created at the same time as the
program or procedure, as part of the original work and testing.  If
they are just included in future programs needing to do the calls, it
provides an effective compile-time safeguard against parameter
mismatchs.

Doug
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