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#include <complex.h> // for complex, I, cabs, carg, cimag, cpow, creal
#include <math.h> // for cos, exp, log, pow, sin
double complex cpow(double complex a, double complex z)
{
double x, y, r, theta, absa, arga;
x = creal(z);
y = cimag(z);
absa = cabs(a);
if (absa == 0.0) {
return (0.0 + 0.0 * (double complex)I);
}
arga = carg(a);
r = pow(absa, x);
theta = x * arga;
if (y != 0.0) {
r = r * exp(-y * arga);
theta = theta + y * log(absa);
}
return r * cos(theta) + (r * sin(theta)) * (double complex)I;
}
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