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isless(3M)		Mathematical Library Functions		    isless(3M)

       isless - test if x is less than y

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

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

       The  isless()  macro determines whether its first argument is less than
       its second argument.  The value of isless(x, y) is equal to (x) <  (y);
       however,	 unlike	 (x)  <	 (y),  isless(x, y) does not raise the invalid
       floating-point exception when x and y are unordered.

       Upon successful completion, the isless() macro returns the value of (x)
       < (y).

       If x or y is NaN, 0 is returned.

       No errors are defined.

       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	excep‐
       tion  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	is  an
       expression of real-floating type.

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

       │      ATTRIBUTE TYPE	     │	    ATTRIBUTE VALUE	   │
       │Interface Stability	     │Standard			   │
       │MT-Level		     │MT-Safe			   │

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

SunOS 5.11			  12 Jul 2006			    isless(3M)

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