//QuadraticsWithMethods by Coby Boley
import java.text.DecimalFormat;
import javax.swing.JOptionPane;

public class QuadraticsWithMethods {

		public static void main(String[] args) {
			JOptionPane.showMessageDialog(null, "QuadraticsWithMethods by Coby Boley");
			double a = inHandler("For the equation, Ax^2+Bx+C = 0, please enter the coefficient A");
			double b = inHandler("For the equation, Ax^2+Bx+C = 0, please enter the coefficient B");
			double c = inHandler("For the equation, Ax^2+Bx+C = 0, please enter the coefficient C");
			JOptionPane.showMessageDialog(null, "a: "+a+ "\nb: "+b+"\nc: "+c);

		}
		public static double inHandler(String prompt){
			double returnValue = 0;
			boolean tryAgain = false;
			do {
				String s = JOptionPane.showInputDialog(prompt);
				try {
					returnValue = Double.parseDouble(s);
					tryAgain = false;
				} catch (NumberFormatException e){
					returnValue = Double.NaN;
					if (Double.isNaN(returnValue)){
						JOptionPane.showMessageDialog(null, "you have entered something I can't understand, please try again.");
						tryAgain = true;
						}
				}
			} while (tryAgain);
			return returnValue;

		}
		public static double discriminant (double a, double b, double c) {
			double disc;
			disc = b*b - 4*a*c;
			return disc;
			}


		public static String comp(double disc, double b, double a) {
	        String rtn;
	        double comp = Math.sqrt(Math.abs(disc));
	        double compA = comp/2*a;
	        double compB = -b/2*a;
	        compA = Double.parseDouble(new DecimalFormat("##.###").format(compA));
	        compB = Double.parseDouble(new DecimalFormat("##.###").format(compB));
	        if (-b == 0) {
	            rtn = "\nThe complex roots are: " + compA + "i and -" + compA + "i";
	        } else {
	            rtn = "\nThe complex roots are: " + compB + "+" + compA + "i and" + compB + "-" + compA + "i";
	        }
	        return rtn;
	    }

	public static void root(double a,double b,double c,double disc)
	{
		//declaring roots as double
		double root1;
		double root2;

		if (disc > 0)

		{
			//real roots if two roots show
			root1 = (-b + Math.sqrt(disc)) / (2 * a);
			DecimalFormat df1 = new DecimalFormat("#.###");
			root1 = Double.valueOf(df1.format(root1));

			root2 = (-b - Math.sqrt(disc)) / (2 * a);
			DecimalFormat df2 = new DecimalFormat("#.###");
			root2 = Double.valueOf(df2.format(root2));
			JOptionPane.showMessageDialog(null,"The roots are: " +root1+" and "+root2);
			//JOptionPane.showMessageDialog(null,"The roots of the Quadratic Equation \"Ax^2 + Bx +C = 0\" are "+root1+" and "+root2);

		}
		else if (disc==0)
		{
			//real roots if roots are the same
			root1 = (-b + Math.sqrt(disc)) / (2 * a);
			JOptionPane.showMessageDialog(null,"Roots is:"+ root1);
			//System.out.println("Root is: " +root1);
		}

	}
	//string to receive test values
	public static double TestNum(String prompt)
	{
		double returnVal = 0;
		String s = JOptionPane.showInputDialog(prompt);

		returnVal = Double.parseDouble(s);

		return returnVal;
	}

}