Re: Number of digits in a number [82]

Subject: Re: Number of digits in a number [82]
From: Mattias Lindqvist <d96mli@EFD.LTH.SE>
Date: Thu, 19 Sep 1996 23:02:05 +0200
In-Reply-To: <Number of digits in a number [82]>

On 18 Sep 96 at 23:29, Matt Maurano wrote:


> I need to know how to find the number of digits in a number. For
> example:
>
> Number: Digits:
> .1234   4
> 1.23     3
> 9          1
>
> For those interested, this is for the second flag passed to the round(
> function. Its for a convert program I've been working on, and it would
> help if I could round the answer to the number of significant digits.
>
> Please E-Mail responses. Thanks in advance.
>
> P.S.: Right now, the program is ~<1k and does standard to and from
> metric, as well as time conversions. If anyone wants me to post it,
> just E-Mail me.


This was snipped from the New Calc-TI FAQ (which you can get from
www.efd.lth.se/~d96mli/tifaq.txt):


4.7 Q: How do I find the length of a REAL variable?
    A: To find the length of the iPart of x:
         length= int log x +1


       To find the lenght of the fPart of x:
         After running this little loop N will contain the number of
         decimal digits:
           :0->N:While (N<(11-int log x)and(round(x,N)<>x):N+1->N:End


       This applies for positive reals only. If x is negative, add 1
       for the "-" character and use the abs-value of x in the
       formulas above.


       If the fPart >0, don't forget to add 1 position for the decimal
       point.


<pre>
--
 Mattias Lindqvist
 d96mli@efd.lth.se
 www.efd.lth.se/~d96mli
</pre>

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