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From: Ron Aaron <rambamist@gmail.com>
Newsgroups: comp.lang.forth
Subject: Re: FP stack
Date: Wed, 10 May 2017 11:00:54 +0300
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On 05/10/17 10:53, Alex wrote:
> On 5/10/2017 08:24, Elizabeth D. Rather wrote:

>> Ok, I'll bite, how do you know 1. doesn't occupy 4 cells?


> d       double-cell signed number   2 cells
> +d      double-cell non-negative number     2 cells
> ud      double-cell unsigned number     2 cells
> d | ud[2]   double-cell number  2 cells
> xd      unspecified cell pair   2 cells

IMO, this is one of the weaknesses of ANS Forth.  You have to keep track
of how many cells your data takes up.  Strings can be one or two cells,
so can numbers; and, I suppose, other things as well.

Wouldn't it have made some sense to make all items take one cell on the
stack so that you could just use SWAP without worrying?