Re: Determining *DS4 support

Paul wrote:
>> C           1             SUBST(P)    DEVCAP:2                 ARTB
>1
>> C                          TESTB         '23'
>> ARTB                         01
>
>FWIW, in RPG IV this can be changed to eliminate the work variable and
>indicator like so:
>
> C         if        (%subst(devCap : 2 : 1) and x'30') = x'30'
>
>Better still would be to define a symbolic constant:
>
> C         if        (%subst(devCap : 2 : 1) and DS4) = DS4
>
>Ideally, it should be possible to just use
>
> C         if        %subst(devCap : 2 : 1) and DS4
>
>but I don't think this behaviour is guaranteed to work.


Damn right that's not going to work!  Here's a radical idea: Why
not compile code snippets before posting?

The reason this code doesn't work is because AND is a logical
operator, not a bitwise operator.  This code snippet fails to
compile because both of the operands to the AND operator are not
valid indicator values.  (Even if the AND operator successfully
compiled, the = comparison would always return *OFF since AND
returns only values of '0' or '1'.)

(Perhaps a future release of RPG may have bitwise operations, but
that's nowhere in plan yet.)

Have a nice day.

Hans Boldt, ILE RPG Development, IBM Toronto Lab, boldt@ca.ibm.com

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