RE: strtok

[Scott Klement <rpg400-l@xxxxxxxxxxxxxxxx>]

Hi Charles,

> In other words, I was thinking gettok() would be called once and every
> element of tokens would be assigned the same value.  But what you're saying
> is that gettok() gets called multiple times, once for every element.

Yep, that's what I'm saying.

That's not the only place where the distinction is important, either.  For
example, how many times will gettok() be called in this code:

     if gettok( foo : '|' : pos ) = 'custno'
         or gettok( foo : '|' : pos ) = 'test';
     endif;

The answer is, "it depends."  If the first token is 'custno' it's called
twice.  If not, it's called once.

Or the opposite:


    if gettok( foo : '|' : pos ) = 'a'
       and gettok( foo : '|' : pos ) = 'b'
       and gettok( foo : '|' : pos ) = 'c'
       and gettok( foo : '|' : pos ) = 'd';
    endif;

If foo contains "a|d|c|b", gettok() is called twice.   If it contains
"|b|c|d" it is called once.  If it contains "a|b|c|e" it's called 4
times...

It's important to understand how expressions work in ILE RPG.
Fortunately, they work the same way as they do in C, C++, Java, etc.  Once
you've learned one of them, the others all fall into place. :)