Week#2 Quadratic Calculator

import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        Scanner input = new Scanner (System.in);
        int a = 0;
        int b = 0;
        int c = 0;

        System.out.println("Let´s solve quadratic equations");
        System.out.println("ax^2 + bx + c = 0");
        System.out.println("Please input your integer a: ");

        if (input.hasNextInt() ){
            a = input.nextInt();
            if (a ==0) {
                System.out.println("you cannot use a=0 for this quadratic calculator, the program will now close.");
                System.exit(0);
            }
        } else{
            System.out.println("You did not enter an integer, the program will now close.");
            System.exit(0);
        }

        System.out.println("Please input your integer b: ");
        if (input.hasNextInt() ){
            b = input.nextInt();
        } else{
            System.out.println("You did not enter an integer, the program will now close.");
            System.exit(0);
        }

        System.out.println("Please input your integer c: ");
        if (input.hasNextInt() ){
            c = input.nextInt();
        } else{
            System.out.println("You did not enter an integer, the program will now close.");
            System.exit(0);
        }


        double rootCheck = (b*b) -(4*a*c);
        double root1;
        double root2;

        if (rootCheck < 0) {
            System.out.println("Sorry your equation has no real roots");
        }else if ( rootCheck == 0){
            System.out.println("Your equation has 2 equal roots");
            root1 = (-b + rootCheck)/(2*a);
            System.out.println("Your roots are: " + root1 + " & " + root1);
        }else {
            System.out.println("Your equation has 2 real roots");
            root1 = (-b + rootCheck)/(2*a);
            root2 = (-b - rootCheck)/(2*a);
            System.out.println("Your roots are: " + root1 + " & " + root2);
        }
    }
}