#include <stdio.h>
#include <math.h>
void f(double a, double b, double c) {
double D, x1, x2;
D = b*b - 4*a*c;
if(D >= 0) {
x1 = (fabs(b) + sqrt(D)) / (2. * a);
x1 = b < 0 ? x1 : -x1;
if(D > 0) {
x2 = c / (a * x1);
printf("%lf, %lf\n", x1, x2);
} else {
printf("%lf\n", x1);
}
}
}
int main(void) {
f(0.0000000045, 10, 1);
return 0;
}