Returns the complex natural (base e) logarithm of its argument.

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

    Format

      #include  <complex.h>

      double complex clog  (double complex z);

      float complex clogf  (float complex z);

      long double complex clogl  (long double complex z);

1 - Argument

 z

    A complex value.

2 - Description

    The clog functions return the complex natural (base e) logarithm
    of z, with a branch cut along the negative real axis.

3 - Return Values

    x                  The complex natural logarithm value in the
                       range of a strip mathematically unbounded
                       along the real axis and in the interval [-
                       iπ, +iπ] along the imaginary axis.