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  1.  Home
  2. RPG400-L
  3. March 2006

Re: Quick question (and I think it's come up before)


On 17/03/2006, at 3:25 AM, James H H Lampert wrote:


What I meant was optional parameters to the program
itself. Not to a prototyped procedure call within it.
You can do either. Prototyping just makes it easier to specify the optional ones. Note that you can prototype program calls as well as procedure calls. CALLP means Call with Prototype. It does not mean Call Procedure.
Although both programs and procedures allow optional parameters only procedures allow omissable ones. 


Certainly an easy enough thing to do with MI or C. But I
don't recall whether or not it's doable in RPG.
Whether a program object allows a variable parameter list depends on how it was compiled. Some languages, such as MI, let the programmer decide, others, such as CL, force a fixed parameter list, and still others, such as RPG, make all parameters optional.
DSPPGM will generally show you whether a program allows optional parameters. A single number means a fixed parameter list; two numbers mean a variable list with the first number being the minimum, or required, parameters and the second number being the maximum. 

CL Program:
Program statistics:
  Number of parameters . . . . . . . . . . . . . . :   5       

RPG Program:
Program statistics:
  Number of parameters . . . . . . . . . . . . . . :   0       6  

MI Program:
Program statistics:
  Number of parameters . . . . . . . . . . . . . . :   1       3  

If observability has been removed you won't see this information.

ILE programs all allow optional parameters. They show:

Program statistics:
  Number of parameters . . . . . . . . . . . . . :   0            255 


I've already figured out another way of doing what's
needed, and I'm going to run an experiment to see what
happens if you call a program with fewer parameters than
specified, but I'm still curious. Perhaps morbidly so.
If you call a program with less than the minimum or more than the maximum number of parameters you will get: 
 Message ID . . . . . . :   CPD0172
Message . . . . : Parameters passed on CALL do not match those required. 

followed by:

 Message ID . . . . . . :   CPF0001
 Message . . . . :   Error found on CALL command.

Regards,
Simon Coulter.
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