1. printf() on decimals
Try this:
printf(1, "%.16g\n", 1999999999999990)
printf(1, "%.16g\n", 2999999999999990)
printf(1, "%.16g\n", 3999999999999990)
printf(1, "%.16g\n", 4999999999999990)
printf(1, "%.16g\n", 5999999999999990)
printf(1, "%.16g\n", 6999999999999990)
printf(1, "%.16g\n", 7999999999999990)
printf(1, "%.16g\n", 8999999999999990)
printf(1, "%.16g\n", 9999999999999990)
Why is the last line printed differently?
2. Re: printf() on decimals
Prints what differently? They look the same to me.
Using exu on RedHat 7.2 with kernel 2.4.18.
jbrown
On Mon, Jun 30, 2003 at 11:01:27PM +0700, aku saya wrote:
>
>
> Try this:
>
> printf(1, "%.16g\n", 1999999999999990)
> printf(1, "%.16g\n", 2999999999999990)
> printf(1, "%.16g\n", 3999999999999990)
> printf(1, "%.16g\n", 4999999999999990)
> printf(1, "%.16g\n", 5999999999999990)
> printf(1, "%.16g\n", 6999999999999990)
> printf(1, "%.16g\n", 7999999999999990)
> printf(1, "%.16g\n", 8999999999999990)
> printf(1, "%.16g\n", 9999999999999990)
>
>
> Why is the last line printed differently?
>
>
>
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3. Re: printf() on decimals
aku saya wrote:
>
>
> Try this:
>
> printf(1, "%.16g\n", 1999999999999990)
> printf(1, "%.16g\n", 2999999999999990)
> printf(1, "%.16g\n", 3999999999999990)
> printf(1, "%.16g\n", 4999999999999990)
> printf(1, "%.16g\n", 5999999999999990)
> printf(1, "%.16g\n", 6999999999999990)
> printf(1, "%.16g\n", 7999999999999990)
> printf(1, "%.16g\n", 8999999999999990)
> printf(1, "%.16g\n", 9999999999999990)
>
>
> Why is the last line printed differently?
My guess is that you reached the limit of single precision floating point.
Ray
4. Re: printf() on decimals
> Try this:
>
> printf(1, "%.16g\n", 1999999999999990)
> printf(1, "%.16g\n", 2999999999999990)
> printf(1, "%.16g\n", 3999999999999990)
> printf(1, "%.16g\n", 4999999999999990)
> printf(1, "%.16g\n", 5999999999999990)
> printf(1, "%.16g\n", 6999999999999990)
> printf(1, "%.16g\n", 7999999999999990)
> printf(1, "%.16g\n", 8999999999999990)
> printf(1, "%.16g\n", 9999999999999990)
>
>
> Why is the last line printed differently?
ex.exe produced:
1999999999999990
2999999999999990
3999999999999990
4999999999999990
5999999999999990
6999999999999990
7999999999999990
8999999999999990
9999999999999990
however, exw.exe produced:
1999999999999990
2999999999999990
3999999999999990
4999999999999990
5999999999999990
6999999999999990
7999999999999990
8999999999999990
9.99999999999999e+015
i assume this has to do with how windows handles floating-point math as
opposed to dos and 'nix.
5. Re: printf() on decimals
- Posted by eugtk at yahoo.com
Jun 30, 2003
> aku saya wrote:
>
> Try this:
>
> printf(1, "%.16g\n", 1999999999999990)
> printf(1, "%.16g\n", 2999999999999990)
> printf(1, "%.16g\n", 3999999999999990)
> printf(1, "%.16g\n", 4999999999999990)
> printf(1, "%.16g\n", 5999999999999990)
> printf(1, "%.16g\n", 6999999999999990)
> printf(1, "%.16g\n", 7999999999999990)
> printf(1, "%.16g\n", 8999999999999990)
> printf(1, "%.16g\n", 9999999999999990)
>
> Why is the last line printed differently?
1999999999999990
2999999999999990
3999999999999990
4999999999999990
5999999999999990
6999999999999990
7999999999999990
8999999999999990
9999999999999990
Press Enter...
The last line looks ok to me. What are we looking for?
Regards,
Irv
6. Re: printf() on decimals
aku saya wrote:
> Try this:
>
> printf(1, "%.16g\n", 1999999999999990)
> printf(1, "%.16g\n", 2999999999999990)
> printf(1, "%.16g\n", 3999999999999990)
> printf(1, "%.16g\n", 4999999999999990)
> printf(1, "%.16g\n", 5999999999999990)
> printf(1, "%.16g\n", 6999999999999990)
> printf(1, "%.16g\n", 7999999999999990)
> printf(1, "%.16g\n", 8999999999999990)
> printf(1, "%.16g\n", 9999999999999990)
>
>
> Why is the last line printed differently?
With %g format you are giving printf some freedom
to choose how it displays floating-point numbers.
I guess exw.exe chose differently for the last one,
probably because it's so close to 1000000....
Euphoria relies on C's printf routine,
and each C library is a bit different.
I can't control details like this without
writing my own full-blown replacement for C's printf.
Regards,
Rob Craig
Rapid Deployment Software
http://www.RapidEuphoria.com
