Returns the exponent of a floating-point number.

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

    Format

      #include  <math.h>

      double scalb  (double x, double n);

      float scalbf  (float x, float n);

      long double scalbl  (long double x, long double n);

1 - Arguments

 x

    A nonzero floating-point number.

 n

    An integer.

2 - Description

    The scalb functions return x*(2**n) for integer n.

3 - Return Values

    x                  On successful completion, x*(2**n) is
                       returned.
    HUGE_VAL           On overflow, scalb returns HUGE_VAL (according
                       to the sign of x) and sets errno to ERANGE.
    0                  Underflow occurred; errno is set to ERANGE.
    x                  x is Infinity.
    NaN                x or n is NaN; errno is set to EDOM.