feclearexcept(3M)feclearexcept(3M)NAMEfeclearexcept() - clear floating-point exception flags
HP Integrity Server Only
The function clears the exception flags represented by its argument.
The argument can be constructed as a bitwise OR of the exception
macros: and represents all the floating-point exceptions.
To use this function, compile either with the default option or with
the and options. Make sure your program includes
For 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 +Onomoveflops compiler option in
order to prevent optimizations that can undermine the specified behav‐
ior of this function.
Link in the math library by specifying on the compiler or linker com‐
For more information, see the
Integrity Server Only
This function always returns 0, indicating all specified exceptions
No errors are defined.
Clear the underflow and inexact floating-point exception flags:
Clear all floating-point exception flags:
SEE ALSOfegetexceptflag(3M), fegettrapenable(3M), feraiseexcept(3M), fesetex‐
ceptflag(3M), fesettrapenable(3M), fetestexcept(3M), fenv(5).
: ISO/IEC C99 (including Annex F, "IEC 60559 floating-point arith‐