Returns the complex square root of its argument.

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

    Format

      #include  <complex.h>

      double complex csqrt  (double complex z);

      float complex csqrtf  (float complex z);

      long double complex csqrtl  (long double complex z);

1 - Argument

 z

    A complex value.

2 - Description

    The csqrt functions compute the complex square root of z, with a
    branch cut along the negative real axis.

3 - Return Values

    x                  The complex square root value in the range of
                       the right half-plane (including the imaginary
                       axis).