can list operations be used to control the prfecision?

[johannes falcone]

liekif I want
2.3
2.5

not

2.3345234534534534535
2.5234523233534535455

I remember there was some complex way to stop this but you had ot change ti back or something after each op...

smeeded dangerous for prod code

[tomás zerolo]

johannes falcone <vispha...@gmail.com> writes:

> liekif I want
> 2.3
> 2.5
>
> not
>
> 2.3345234534534534535
> 2.5234523233534535455

printf "%0.2f" 3.1415926535
=> 3.14

HTH
-- tomás

[Donal K. Fellows]

On 21/05/2013 13:24, tomás zerolo wrote:
> printf "%0.2f" 3.1415926535
> => 3.14

I think you mean [format] there...

Donal.
--
Donal Fellows — Tcl user, Tcl maintainer, TIP editor.

[tomás zerolo]

"Donal K. Fellows" <donal.k...@manchester.ac.uk> writes:

> On 21/05/2013 13:24, tomás zerolo wrote:
>> printf "%0.2f" 3.1415926535
>> => 3.14
>
> I think you mean [format] there...

Yes! Thanks for the catch.

(Actually, I did test the code... and it worked! But that was due to
tclsh picking up /usr/bin/printf via the [unknown] handler. Tsk, tsk :)

Regards
-- tomás

[johannes falcone]

interesting

seems C ish

are you expected to know C to use tcl seriously?

[tomás zerolo]

See Don's answer to my post. The function I used is printf, which on an
UNIXoid is typically in /usr/bin/printf (these days, at least). And this
one is definitely inspired in C's printf (which is itself inspired in...
but I disgress [1]).

As it turns out, it just worked by chance. The proc to use in Tcl is
[format] [2], which is itself inspired in... C's printf.

So yes, in some sense it helps knowing C's printf. But [2] helps too,
and is self-contained.

[1] <https://en.wikipedia.org/wiki/Printf>
[2] <https://www.tcl.tk/man/tcl8.4/TclCmd/format.htm>