Help in Understanding awk if ( F ) syntax

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isunordered

isunordered(3M) 					  Mathematical Library Functions					   isunordered(3M)

NAME

       isunordered - test if arguments are unordered

SYNOPSIS

       c99 [ flag... ] file... -lm [ library... ]
       #include <math.h>

       int isunordered(real-floating x, real-floating y);

DESCRIPTION

       The isunordered() macro determines whether its arguments are unordered.

RETURN VALUES

       Upon successful completion, the isunordered() macro returns 1 if its arguments are unordered and 0 otherwise.

ERRORS

       No errors are defined.

USAGE

       The  relational and equality operators support the usual mathematical relationships between numeric values. For any ordered pair of numeric
       values, exactly one of the relationships (less, greater, and equal) is true. Relational operators  can  raise  the  invalid  floating-point
       exception  when	argument  values  are  NaNs. For a NaN and a numeric value, or for two NaNs, just the unordered relationship is true. This
       macro is a quiet (non-floating-point exception raising) version of a relational	operator.  It  facilitates  writing  efficient	code  that
       accounts  for  quiet NaNs without suffering the invalid floating-point exception. In the SYNOPSIS section, real-floating indicates that the
       argument shall be an expression of real-floating type.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Standard			   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |MT-Safe			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       isgreater(3M), isgreaterequal(3M), isless(3M), islessequal(3M), islessgreater(3M), math.h(3HEAD), attributes(5), standards(5)

SunOS 5.11							    12 Jul 2006 						   isunordered(3M)

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