double

MJKUOG

Hi,
I am wondering how many digits after '0' does double keeps. Is there
anyway to increase it if it is not big enough in special cases?
Thanks,
MJKUOG

Apr 25 '07 #1

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2308

red floyd

MJKUOG wrote:

Hi,
I am wondering how many digits after '0' does double keeps. Is there
anyway to increase it if it is not big enough in special cases?
Thanks,
MJKUOG

Assuming IEEE-754, you have a 52-bit mantissa. Work from there.

Apr 25 '07 #2

Victor Bazarov

red floyd wrote:

MJKUOG wrote:
>Hi,
I am wondering how many digits after '0' does double keeps.

"After '0'"? Do you mean after decimal point?

Is there
>anyway to increase it if it is not big enough in special cases?
Thanks,
MJKUOG

Assuming IEEE-754, you have a 52-bit mantissa. Work from there.

There is no need to assume anything. Use the value of
std::numeric_limits<double>::digits10 to find out the total
representable decimal positions, then subtract the number of
digits before the decimal point, if that's truly what you're
after.

V
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