/* Programme qui lit et affiche les caractères */
#include <stdio.h>
#include <math.h>

struct Complex {
	double a;
	double b;
};

int main() {
	double a, b, c;
	printf("Saisissez les réels a≠0, b et c séparés par une virgule\n");
	scanf("%lf,%lf,%lf", &a, &b, &c);
	if (a == 0) {
		printf("On a dit a≠0 !\n");
	} else {
		double d = pow(b,2)-4*a*c;
		printf("%lf\n", d);
		if (d == 0) {
			printf("x0 = %lf", -b/2*a);
		} else if (d > 0) {
			printf("x1 = %lf; x2 = %lf", (-b+sqrt(d))/2*a, (-b-sqrt(d))/2*a);
		} else { 
			struct Complex z1,z2;
			z1.a = z2.a = pow(b,2)/2*a;
			z1.b = sqrt(-d)/2*a;
			z2.b = -sqrt(-d)/2*a;
			printf("z1 = %lf+i%lf; z2 = %lf+i%lf\n", z1.a, z1.b, z2.a, z2.b);

		}
	}
	return 0;
}