NAME
isunordered() — floating-point comparison macro (unordered)
SYNOPSIS
#include <math.h>
int isunordered(
floating-expr
x,
floating-expr
y);
DESCRIPTION
The
isunordered()
macro determines whether its arguments are unordered. The arguments
are unordered if at least one argument is a NaN.
The arguments must be of floating type.
For Itanium(R)-based systems, the arguments
can be any floating type. For PA-RISC, each argument must be
either
double
or
float.
USAGE
To use the
isunordered()
macro, compile either with the default
-Ae
option or with the
-Aa
and
-D_HPUX_SOURCE
options. Make sure your program includes
<math.h>.
Link in the math library by specifying
-lm
on the compiler or linker command line.
RETURN VALUE
The
isunordered()
macro returns 1 if its arguments are unordered (that is, if either
argument is a NaN) and 0 otherwise. The macro raises no floating-point
exceptions.
ERRORS
No errors are defined.
STANDARDS CONFORMANCE
isunordered(): ISO/IEC C99
