I thought I knew this. What's wrong with this Prototype/Call?

[Jim Langston <jlangston@xxxxxxxxxxx>]

Aren't' you supposed to pass parameters by reference when they can
be changed? My understanding is, by reference is by pointer, by value
is a copy of the variable.  Or am I wrong?

D atoi            PR                  EXTPROC('_atoi')
D                               10U 0
D                                 *
D                               10U 0

D  DQD_SplNumber         49     52U 0
D SpoolNumber     S             10A
D @SpoolNumber    S               *

@SpoolNumber = %Addr(SpoolNumber);
atoi(DQD_SplNumber: SpoolNumber: 10);

*RNF7542 30      1 Parameter cannot be passed by reference when it can be
                   changed during the call.

Regards,

Jim Langston