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isunordered(3M)

HP-UX 11i Version 3: February 2007
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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 HP Integrity servers, 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

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