I was afraid that might be the case. So let me ask hypothetically, if the
Palm OS supported the "%f" formatting modifier on the StrPrintF function
(e.g. returnedString = StrPrintF("%f", floatValue);), what value would be
placed into returnedString if the float values were:
12.3450
123.400
1234.56
1234.50
12345.00
Dave
Mike Walters <[EMAIL PROTECTED]> wrote in message news:41279@palm-dev-forum...
>
> By "number of decimal places" do you mean the number before the decimal,
the
> number after, or both?
>
> 1) For the number before the decimal place: I don't know of a built-in
> function, but you could use a small piece of code like the following to
> count the number of places:
>
> int CountDigits (float your_val)
> {
> int count;
>
> count = 0;
> while (your_val > 1.0)
> {
> count ++;
> your_val /= 10.0;
> }
> return count;
> }
>
> 2) For the number of digits after the decimal, the answer really can't be
> determined (do you count all of the trailing zeros, worry arount floating
> point rounding, etc). So the easiest thing to do is just select a value
to
> use in displaying your number, then truncate off any trailing zeros that
you
> don't want.
>
> 3) For the total number of digits, you could probably use a combination of
> the two methods above.
>
> Of course, for any kind of problem, you are going to find almost as many
> solutions as you have responses. An without having the M&R book in front
of
> me, I'm not sure the value that it is expecting to be passed.
>
> Hope this helps,
>
> Mike Walters
> Rose Software
>
>
>
> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED]]On Behalf Of David
> Leland
> Sent: Thursday, March 01, 2001 9:28 AM
> To: Palm Developer Forum
> Subject: Determining number of decimal positions
>
>
> I have a function that is being passed a float value. In my function, I
> will be formatting that float value to a string (e.g. 1234.56 to
1,234.56)
> and returning it. My problem is that I do not know the number of decimal
> places being passed. The float value could be 123.456 or it could be
> 1234.56 or 12.3456. Is there a way I can determine how many decimal
> positions that float value has?
>
> "Advanced Palm Programming" by Mann & Rischpater has an excellent routine
> for formatting a float value to a string but unfortunately, it expects the
> calling function to tell it how many decimal places to format. My App is
a
> Plug-in to another Palm App so I don't have the luxury of knowing upfront
> how many decimal places the float value has.
>
> Thanks,
> Dave
>
>
>
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