Mathematical interfaces

Most implementations support IEEE floating-point format either in hardware or software. Some implementations support other formats with different exponent and mantissa accuracy. QNX Neutrino supports IEEE 754 in hardware.

The fegetexceptflag(), feraiseexcept(), fesetexecptflag(), and fetestexecptflag() functions support the following floating-point exceptions:

The fegetround() and fesetround() functions support the following floating-point rounding directions:

QNX Neutrino supports a non-stop floating-point exception mode.