Mathematical Library Functions                          isinf(3M)



NAME
     isinf - test for infinity

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

     int isinf(real-floating x);


DESCRIPTION
     The isinf() macro determines whether its argument  value  is
     an  infinity  (positive  or  negative).  First,  an argument
     represented in a format wider than its semantic type is con-
     verted  to its semantic type. Then determination is based on
     the type of the argument.

RETURN VALUES
     The isinf() macro returns a non-zero value if  and  only  if
     its argument has an infinite value.

ERORS
     No errors are defined.

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



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


SEE ALSO
     fpclassify(3M),   isfinite(3M),   isnan(3M),   isnormal(3M),
     math.h(3HEAD), signbit(3M), attributes(5), standards(5)













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