Re: Calculate the precision of a floating point number (ie: the number of decimal places)

On Oct 30, 7:28 pm, Ed Prochak <edproc...@xxxxxxxxx> wrote:
IOW number of significant digits?

I guess

First, can you tell me how many significant digits exist in these
numbers
0.01e-21
0.00
0.000000
???????


1. 0.01e-21 = 0.00000000000000000000001: so 23 decimal places
2. 0.00 = 0: so 0 decimal places
3. 0.000000 = 0: so 0 decimal places


To use a New hampshire proverb:
you can't get there from here

What you need is to better define your requirements.
Ed

For sure. So the requirement is this: represent the decimal number as
an integer and a "format indicator", which is '0' - '9' for a positive
number with 0 to 9 decimal places respectively, or 'A' to 'J' for a
negative number with 0 to 9 decimal places respectively

Therefore: 34.125 would be 334125, and -10.0005 would be D100005

So my function is to take any "double" input, calculate the number of
dec places / precision / sig digits (not sure of correct terminology,
of if indeed there is any difference there), and return an integer.

ie: for
input 34.125 output 3
input -10.0005 output 4
input 0.0000 output 0


.