Roots of Quadratic Equation in Java

1import java.util.Scanner;
2
3public class Main {
4    public static void main(String[] args) {
5        Scanner sc = new Scanner(System.in);
6
7        System.out.print("Enter a: ");
8        double a = sc.nextDouble();
9        System.out.print("Enter b: ");
10        double b = sc.nextDouble();
11        System.out.print("Enter c: ");
12        double c = sc.nextDouble();
13
14        double d = b * b - 4 * a * c;
15
16        if (d > 0) {
17            double r1 = (-b + Math.sqrt(d)) / (2 * a);
18            double r2 = (-b - Math.sqrt(d)) / (2 * a);
19            System.out.println("Two real and distinct roots: " + r1 + " and " + r2);
20        } else if (d == 0) {
21            double r = -b / (2 * a);
22            System.out.println("Two equal real roots: " + r + " and " + r);
23        } else {
24            double real = -b / (2 * a);
25            double imag = Math.sqrt(-d) / (2 * a);
26            System.out.println("Complex roots: " + real + " + " + imag + "i and " + real + " - " + imag + "i");
27        }
28
29        sc.close();
30    }
31}