NAME    [Toc]    [Back]

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

SYNOPSIS    [Toc]    [Back]

       #include <math.h>

       int isinf(double value);

       int isnan(double value);

       int finite(double value);

DESCRIPTION    [Toc]    [Back]

       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-number"
 (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.

CONFORMING TO    [Toc]    [Back]

       BSD 4.3



GNU				  1993-06-02			      ISINF(3)