Mathematical Library Functions                         isless(3M)



NAME
     isless - test if x is less than y

SYNOPSIS
     c99 [ flag... ] file... -lm [ library... ]
     #include 

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


DESCRIPTION
     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.

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


     If x or y is NaN, 0 is returned.

ERORS
     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 relation-
     ships  (less, greater, and equal) is true. Relational opera-
     tors 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) ver-
     sion of a relational operator. It facilitates writing  effi-
     cient  code  that  accounts for quiet NaNs without suffering
     the invalid floating-point exception. In the  SYNOPSIS  sec-
     tion,  real-floating  indicates  that  the  argument  is  an
     expression of real-floating type.

ATRIBUTES
     See attributes(5) for descriptions of the  following  attri-
     butes:










SunOS 5.11          Last change: 12 Jul 2006                    1






Mathematical Library Functions                         isless(3M)



     
           ATRIBUTE TYPE               ATRIBUTE VALUE       
    
     Interface Stability          Standard                    
    
     MT-Level                     MT-Safe                     
    


SEE ALSO
     isgreater(3M),     isgreaterequal(3M),      islessequal(3M),
     islessgreater(3M),  isunordered(3M),  math.h(3HEAD),  attri-
     butes(5), standards(5)










































SunOS 5.11          Last change: 12 Jul 2006                    2