一元二次方程

public class Fc {
int a, b, c;
public void gen() {
double i;
double j = 1.0;
double k = 1.0;
i = b * b - 4 * a * c;
if (i >= 0){
j = ((-b) + Math.sqrt(i)) / 2 * a;
k = ((-b) - Math.sqrt(i)) / 2 * a;
System.out.println(j);
System.out.println(k);
}
}
public static void main(String[] args) {
Fc s = new Fc();
s.a = 1;
s.b = 5;
s.c = 6;
s.gen();
}
}