How can I find the maximium number of decimal digits representable in a double?

[JUANDENT]

What is the maximum precision of double?

numeric_limits<double>::?????

default precision is 6 digits after the period

[Peter87]

Wikipedia wrote:

The 53-bit significand precision gives from 15 to 17 significant decimal digits precision

https://en.wikipedia.org/wiki/Double-precision_floating-point_format

Note that it's talking about significant digits, not digits after the decimal separator.

If you print more digits than this you cannot expect them to be accurate.

[JUANDENT]

how can this be obtained from numeric_limits<double> ?

[Peter87]

https://en.cppreference.com/w/cpp/types/numeric_limits/digits10