An example of computing R and Theta for a complex number in C99

complex.c

#include <stdio.h>
#include <stdlib.h>
#include <complex.h>

int main(int argc, char* argv[])
{
	float _Complex number = 1 + (1 * _Complex_I);
	
	printf("%g, %g", cabs(number), carg(number));

	exit(0);
}