isunordered

isunordered

Floating-point unordered comparison

Portability: C99

SYNOPSIS
DESCRIPTION
RETURN VALUE
RELATED FUNCTIONS
SEE ALSO

SYNOPSIS

   #include <math.h>

   int isunordered(floating x, floating y);

DESCRIPTION

isunordered returns whether its two arguments, x and y, may be compared. It returns non-zero if either argument is a NaN (Nan's cannot be compared), or returns zero if neither argument is a NaN. No floating point exception is raised if an argument is a NaN.

RETURN VALUE

1 if x and y are unordered, and zero otherwise.

RELATED FUNCTIONS

isgreater, isgreaterequal, isless, islessequal, islessgreater

SEE ALSO

"Mathematical Functions" in Chapter 2, "Function Categories"

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