QuadraticEquation

/**
 * This class prompts the user for the coefficients of their quadratic equation then calculates the roots of the equation.
 *
 * @author (Allie)
 * @version (4/26/17)
 */
import java.util.Scanner;
public class QuadraticEquation
{
   public static void main(String[] args)
    {
        Scanner scan = new Scanner(System.in); // importing the scanner

        System.out.println("Your equation should be in the format ax^2 + bx + c.");// informing the user of the names of the values in their equation.
        System.out.println();

        System.out.print("Please enter your first value a: "); // prompting the user for a
        double a = scan.nextDouble();

        System.out.print("Please enter your second value b: "); // prompting the user for b
        double b = scan.nextDouble();

        System.out.print("Please enter your third value c: "); // prompting the user for c
        double c = scan.nextDouble();


        double deter = (Math.pow(b,2)) - (4 * a * c); // calculating the determinant inside the radical

        if (deter > 0)
        {
            double num1 = ((-1)*b) + (Math.sqrt(deter)); // calculating the numerator of the equation for the first root
            double num2 = ((-1)*b) - (Math.sqrt(deter)); // calculating the numerator of the equation for the second root

            double root1 = num1 / (2*a); // calculating the first root
            double root2 = num2 / (2*a); // caclulating the second root

            System.out.println();
            System.out.println("The roots of your quadratic equation are " + root1 + " and " + root2 + "."); // printing the calculated roots
            System.out.println("Have a good day!");
        }
        else if (deter < 0)
        {
            System.out.println();
            System.out.println("Your quadratic equation does not have any real roots.");
            System.out.println("Have a good day!");
        }

        else
        {
            double num1 = ((-1)*b); // calculating the numerator of the only root when the determinant is 0

            double root = num1 / (2*a); //calculating the root

            System.out.println();
            System.out.println("The only root of your quadratic equation is " + root + "."); // printing the calculated root
            System.out.println("Have a good day!");
        }
    }
}