nth root of any number

cnroot.c

//finding n nth root of any number. 
#include <stdio.h>
#include <math.h>
#include <complex.h>
// find nth root of c and store it in root array
void cnroot(complex c, int n, complex *root)
{
	double m = cabs(c);
	double th = carg(c);
	for(int i=0; i< n; i++)
	{
		double x = pow(m,1.0/n)*(cos((th+2*M_PI*i)/n));
		double y = pow(m,1.0/n)*(sin((th+2*M_PI*i)/n));
		root[i] = x+I*y;
	}
}
void printfc(complex z)
{
	printf("%f%+fi\n", (double)z, *((double*)&z+1));
}
int main()
{
	complex z;
	complex rt[30]; // array to store roots(pre allocated for 30
	z = 1;
	cnroot(z,5,rt);
	printfc(rt[0]);
	printfc(rt[1]);
	printfc(rt[2]);
	printfc(rt[3]);
	printfc(rt[4]);
}
/* five fifth roots of 1
 * 1.000000+0.000000i
 * 0.309017+0.951057i
 * -0.809017+0.587785i
 * -0.809017-0.587785i
 * 0.309017-0.951057i
 */