Availability:built-in
- nan
- Float is “Not a number” . See nan/0.
May be produced if the Prolog flag float_undefined
is set to
nan. Although IEEE 754 allows NaN to carry a payload and have a sign, SWI-Prolog has only a single NaN values. Note that two NaN terms compare equal in the standard order of terms (==/2, etc.), they compare non-equal for arithmetic (=:=/2, etc.). - infinite
- Float is positive or negative infinity. See inf/0.
May be produced if the Prolog flag float_overflow
or the flag float_zero_div
is set to
infinity. - zero
- Float is zero (0.0 or -0.0)
- subnormal
- Float is too small to be represented in normalized format.
May not be produced if the Prolog flag
float_underflow
is set to
error. - normal
- Float is a normal floating point number.