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

 

[red floyd]

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.

 

[Victor Bazarov]

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

Is there

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