[ColorForth] Question regarding if

[Kristopher Johnson <kristopher_d_johnson@xxxxxxxxx>]

The ? (question-mark) word will test the top-of-stack and set CPU flags.

So you may be able to write your word like

: tst ? if 1 ; then 2 ;

(I can't test this myself.)

-- Kris


--- Alex Thiel <alex.lists@xxxxxxxxxx> wrote:
> Hello,
> 
> I want to write a word that test the TOS for a non-zero value. I have tried
> 
> : tst if 1 ; then 2 ;
> : foo 0 tst 1 tst ;
> 
> Execution of foo leaves 0 2 1 2 on the stack, i.e. pushing a constant does
> not 
> seem to affect the flags. Is this expected behavior?
> 
> As a workaround I do
> : tst 0 or if 1 ; then 2 ;
> 
> Does anyone have a better idea?
> 
> Cheers,
> 
> 	Alex


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