In article <2025Apr15.235921@mips.complang.tuwien.ac.at>,
Anton Ertl wrote:
>mhx@iae.nl (mhx) writes:
>>> 1_0 2_0 + . \ output: 30
>>
>>Sorry, I really don't like this. It takes away my
>>underlying mental model of how things should work.
>>What happens for "10_ 20_ + ." ?
>
>It outputs 30, too. The intended use of _ in Gforth is like this:
>
>100_000_000_000 20_000_000_000 + . \ outputs 120000000000
>
>or with groups of 4 for those environments where that is conventional.
>
>What does your underlying mental model say how things should work?
The characters fit for grouping digits are, as long as we want a
range for large number bases:
&0 BL DO I EMIT LOOP
!"#$%&'()*+,-./
If you insist that 1a and 1A is the same number, you have more choice,
but your limit yourself to base 36.
. is the decimal point. Thank god there is no adaptation to nationality
in Forth.
&_ is fine as a separator because it is out of the range of even 64
base numbers.
The comma, the hash, are most fit with single and double quotes a
distant second.
The rational use of grouping numbers is &, , because there is ample
precedent and recognition for that.
for example
The US national debt is
36,482,590,720,183.13 dollars.
(The 13 cent is not precise, it may go up slightly since this writing.)
We must let go of the figforth habit to ignore all non-digit characters
to interpret 19:80:07 as a wall clock time.
>
>- anton
Groetjes Albert
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