====== cpow ======
<code c>

double complex cpow(double complex x, double complex y);
</code>

==== description of cpow ====
calculate the complex power

<code c>
#include <complex.h>
#include <stdio.h>

int main(void)
{
   double complex zd= (double complex) -4.2 + I*4.2;
   double zpowd=(double complex) (long double complex)42.0;
   double result;

   result = cpow(zd,zpowd);
   printf("cpow(%f + I*%f,%f + I*%f) = %f\n",creal(zd), cimag(zd), creal(zpowd), cimag(zpowd), result);
   return 0;
}

</code>

===== output of cpow c example =====
    cpow(-4.200000 + I*4.200000,42.000000 + I*0.000000) = 0.000000