fegetround(3M)fegetround(3M)NAMEfegetround() - get floating-point rounding direction mode
The function gets the current rounding direction, as specified by the
IEEE 754 (IEC 60559) floating-point standard.
The default rounding direction mode is round to nearest
To use this function, compile either with the default option or with
the and options. Make sure your program includes
For HP Integrity servers, specify on the compiler command line or place
the call to this function under the effect of an affirmative pragma:
If the pragma is placed outside of any top-level declarations in a
file, the pragma will apply to all declarations in the compilation fol‐
lowing the pragma until another pragma is encountered or until the end
of the file is reached.
If the pragma is placed at the beginning of a block (compound state‐
ment), the pragma will apply until another pragma is encountered or
until the end of the block is reached.
For PA-RISC, you might need to use the compiler option in order to pre‐
vent optimizations that can undermine the specified behavior of this
Link in the math library by specifying on the compiler or linker com‐
For more information, see the at the following site:
The function returns the value of the rounding direction macro repre‐
senting the current rounding direction. The return value will match
one of the following macros, which are defined in
Round to nearest. If the two nearest representable are equally
the one with its least significant bit zero
Round upwards (towards +infinity).
Round downwards (towards -infinity).
Round toward zero.
No errors are defined.
Save, set, and restore the rounding direction.
SEE ALSOfesetround(3M), fenv(5).
: ISO/IEC C99 (including Annex F, ``IEC 60559 floating-point arith‐