Returns the integer value 1 (True) when its argument is a finite
    number, or 0 (False) if not.

    This function is supported on OpenVMS Integrity servers and
    Alpha only.

    Format

      #include  <math.h>

      int finite  (double x);

      int finitef  (float x);

      int double finitel  (long double x);

1 - Argument

 x

    A real value.

2 - Description

    The finite functions return 1 when -Infinity < x < +Infinity.
    They return 0 when |x| = Infinity, or x is a NaN.