bob bob

I need help with this program, cant figure it out at all!!!

Computer Science I Lab 14H – THE TREE LAB Lab Value - 120

Lab Goal : The lab was designed to teach you how to use arrays to simplify solving more complex problems.

Lab Description : Using graphics, polygons, and arrays, draw the tree shown below. You can change the tree anyway you like to make it your own.

It outputs a triangular xmas tree, with presents and ornaments . Please HELP!!!

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My code is

import java.io.*;

import java.util.*;

public class QuadraticFormula

{

public static void main(String[] args)

{

System.out.println("The form must be ax^2+bx+c to use this program.");

Scanner kbReader=new Scanner(System.in);

System.out.print("Enter A: ");//ax^2

double a= kbReader.nextDouble();

System.out.print("Enter B: ");//bx

double b= kbReader.nextDouble();

System.out.print("Enter C: ");// c

double c= kbReader.nextDouble();

double ab= 2;//number for the second power

double d= Math.pow( (double) b, (double) ab);//raises b two the 2nd power. first part of determinate

double e= b*(-1); //first part of formula. changes b to a negative

double f= 2*a;//divisore of problem

double ga= 4*a;

double g= ga*c;//second part of determinate

double h= d-g;//whole determinate

double i= Math.sqrt( (double) h); //sqrt b^2-4ac

double bc= e+i;//top of equation added

double cd= e-i;//top of equation subtracted

double de= bc/f;//whole equation

double ef= cd/f;//whole equation

System.out.println("The zeros of this equation are "+ de + " and "+ ef + ".");

}

}

When i run the program its out put is -

The form must be ax^2+bx+c to use this program.

Enter A: 1

Enter B: 2

Enter C: 8

The zeros of this equation are NaN and NaN.

Where it says NaN is where it messes up, i wrote all the other stuff in the code. My question is why does it say NaN and how do i fix it. i know NaN means not a number but where is my error and how do i fix it. please help!!!

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