Re: Help with parameter passing

Eric,

> One of the functions is passing tax_amt and tax_rate as
> 
> double *pTransTotalTax,
> double *pTransCombRate,

This c function is actually asking for a pointer to a double.  Note the
asterisk just before the variable name.

> 
> which we've coded as
> 
> D  pTransExtdAmt                 8f         
> D  pTransTotalTx                 8f         

Try coding it
  D  pTransExtdAmt                  *
  D  pTransTotalTx                  *

> 
> So far so good.  Now the problem.  The use of this api states:
> 
> "Total tax amount for the transaction. This parameter is used when 
> processing special (tax-only debit and tax-only credit) transactions. 
> This parameter is ignored if NULL is passed. Passing 0 results in zero

> tax being calculated."
> 
> Entended amount is fine, since we will have a calculated value for 
> that every time we call the api.  But for the call to work properly, 
> we must send the other parm as NULL.  How in the he!! am I supposed to

> do that?  Does C consider a parm to be null if the address is null?

In RPG use *Null

HTH,
Andy Holmer