### 3.5.1 The number of significant digits

By default Xcas uses and displays 12 significant
digits, but you can set the number of digits to other positive
integers. If you set the number of significant digits to a number
less than 14, then Xcas will use the computer’s
floating point hardware, and so calculations will be done to more
significant digits than you asked for, but only the number of digits
that you asked for will be displayed. If you set the number of
significant digits to 14 or higher, then both the
computations and the display will use that number of digits.

You can set the number of significant digits for Xcas by
using the CAS configuration screen (see subsection 3.5.7).
The number of significant
digits is stored in the variable DIGITS or Digits,
so you can also set it by giving the variable DIGITS a new
value, as in DIGITS:= 20. The value will be stored in the
configuration file (see subsection 3.5.10), and so can also be set there.