Quadratic equation in C

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

void print(int ind, double complex x) {
    printf("x%d = ", ind);
    if (fabs(cimag(x)) < 1e-6)
        printf("%f\n", creal(x));
    else printf("(%f, %f)\n", creal(x), cimag(x));
}

int main() {
    double A, B, C;
    double D;
    printf("A = ");
    scanf("%lf", &A);
    if (fabs(A)<1E-3) {
        printf("Not a quadratic equation\n");
        return 1;
    }
    printf("B = ");
    scanf("%lf", &B);
    printf("C = ");
    scanf("%lf", &C);

    A *= 2;
    D = B*B-A*C*2.0;
    if (fabs(D)<1E-3)
        printf("x = %f", creal(-B/A));
    else {
        print(1, (-B+csqrt(D))/A);
        print(2, (-B-csqrt(D))/A);
    }
    return 0;
}