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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-
       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

       BSD 4.3