finite

ISINF(3)		  Linux Programmer’s Manual		     ISINF(3)



NAME
       isinf, isnan, finite - test for infinity or not-a-number (NaN)

SYNOPSIS
       #include <math.h>

       int isinf(double value);

       int isnan(double value);

       int finite(double value);

DESCRIPTION
       The isinf() function returns -1 if value represents negative infinity,
       1 if value represents positive infinity, and 0 otherwise.

       The isnan() function returns a non-zero value if value is  "not-a-num-
       ber" (NaN), and 0 otherwise.

       The  finite()  function	returns	 a non-zero value if value is neither
       infinite nor a "not-a-number" (NaN) value, and 0 otherwise.

NOTE
       C99 provides additional macros, such as the  type-independent  fpclas-
       sify(), isinf() and isnan().

CONFORMING TO
       BSD 4.3

SEE ALSO
       fpclassify(3)



				  2002-07-27			     ISINF(3)