HP-UX Reference (11i v1 00/12) - 3 Library Functions A-M (vol 6)

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STANDARD Printed by: Nora Chuang [nchuang] STANDARD
/build/1111/BRICK/man3/!!!intro.3c
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i
isunordered(3M) isunordered(3M)
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 unor-
dered if at least one argument is a NaN.
The macro can be used with either double or float arguments.
The ISO/ANSI C committee has approved the isunordered() macro for inclusion in the C9X draft
standard.
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.
ERRORS
No errors are defined.
SEE ALSO
isgreater(3M), isgreaterequal(3M), isless(3M), islessequal(3M), islessgreater(3M), math(5).
Section 3−−476 − 1 − HP-UX Release 11i: December 2000
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