DecimalFormat

import java.util.Scanner;
import java.text.DecimalFormat;
public class DecimalFormatt{
    public static void main(String args[]){
        int a,b,c;
        double discriminant, root1, root2;
        Scanner read = new Scanner(System.in);

        System.out.println("Enter the coefficient of x squared: ");
        a = read.nextInt();

        System.out.println("Enter the coefficient of x: ");
        b = read.nextInt();

        System.out.println("Enter the constant: ");
        c = read.nextInt();

        discriminant = Math.pow(b,2)-(4*a*c);
        root1= ((-1*b)+Math.sqrt(discriminant))/(2*a);
        root2= ((-1*b)-Math.sqrt(discriminant))/(2*a);

        DecimalFormat fmt = new DecimalFormat("0.###");
        System.out.println("Root1: "+ fmt.format(root1));
        System.out.println("Root2: "+ fmt.format(root2));

    }
}