1. floats in (s)printf
- Posted by Mike Burrell <mikpos at USA.NET>
Mar 29, 1997
-
Last edited Mar 30, 1997
i just noticed that printf and sprintf by default display like 6
digits after the decimal place or something like that with %e, %f and %g...
i was wondering it were possible (practical) to have some way of
displaying just enough digits that would still give all the accuracy of the
number... i.e. if i were to do a printf(1,"%f",5.5) it would print out
"5.5", but if i were to do a printf(1,"%f",5.55555555555555555) it would
print out that number to 15 decimal places or whatever it is... you know
what i'm saying?? okay
2. Re: floats in (s)printf
- Posted by Joshua Milligan <silverlaser at HOTMAIL.COM>
Mar 29, 1997
-
Last edited Mar 30, 1997
Mike Burrell <mikpos at USA.NET> wrote:
>i just noticed that printf and sprintf by default display like 6
>digits after the decimal place or something like that with %e, %f and >%g... i
was wondering it were possible (practical) to have some way >of displaying just
enough digits that would still give all the >accuracy of the number... i.e.
if i were to do a printf(1,"%f",5.5) >it would print out "5.5", but if i were
to do a >printf(1,"%f",5.55555555555555555) it would print out that number to
>15 decimal places or whatever it is... you know what i'm saying?? >okay
What if you were to store 5.5555 or whatever as a sequence ( {5}, {5}, {5}
etc.--every element after the first being right of the decimal)? Then you
could build a structure that would print it with only the number of decimals
needed. My attempt is below. There's probably a beter way of doing what
you're talking about (This way is not very convenient and probably not very
efficient 
And of course the sequence is not the actual number, and there
are a million other problems. But it was a thought. Good luck
Joshua Milligan
Here's my attempt:
--------------------------------start of code
sequence fives
fives = {{5}, {5}, {5}, {5}, {5}, {5}, {5}}
printf (1, "%g.", fives[1])
for i = 2 to length(fives) by 1 do
printf (1, "%g", fives[i])
end for
---------------------------------end code
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3. Re: floats in (s)printf
- Posted by David Alan Gay <moggie at INTERLOG.COM>
Mar 29, 1997
-
Last edited Mar 30, 1997
> i just noticed that printf and sprintf by default display like 6
> digits after the decimal place or something like that with %e, %f and
%g...
> i was wondering it were possible (practical) to have some way of
> displaying just enough digits that would still give all the accuracy of
the
> number... i.e. if i were to do a printf(1,"%f",5.5) it would print out
> "5.5", but if i were to do a printf(1,"%f",5.55555555555555555) it would
> print out that number to 15 decimal places or whatever it is... you know
> what i'm saying?? okay
Well, Euphoria does allow specification of field width and decimal
precision for displaying numbers. For example, %6.3f means a field width of
6 positions with a precision of 3 decimal points. I don't know if it goes
to 15 decimal points however...never tried.
Hope this helps
David Gay
http://www.interlog.com/~moggie/Euphoria
"A Beginner's Guide To Euphoria"
