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Thread: Quadratic formula

  1. #1
    Junior Member
    Join Date
    Sep 2014
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    Default Quadratic formula

    Hi I don't know if I am taking the wrong approach with this as I have just started to learn programming in the book I am teaching myself from it said how would you write the following arithmetic expression with it being the quadratic formula but only the plus part of it in the plus or minus..
    package javalearning;
    import java.util.Scanner;
    public class QuadraticFormula {
        public static void main(String[] args){
        Scanner input = new Scanner(System.in);
        System.out.print("Enter value for B: ");
        double B = input.nextDouble();
        System.out.print("Enter value for A: ");
        double A = input.nextDouble();
        System.out.print("Enter value for C: ");
        double C = input.nextDouble();
        double negativeOfB = -B;
        double bPowerOfTwo = Math.pow(B, 2);
        double squareRoot = Math.sqrt(bPowerOfTwo - (4 * A * C));
        double Dividend = negativeOfB + squareRoot;
        double Divisor = 2 * A;
        double Answer = Dividend / Divisor;
        System.out.println("The answer to the Quadratic Formula where B is " + 
                B + " A is " + A + " and C is " + C + " is " + Answer + ".");

    The result for a problem I know the answer to is 5
    Enter value for B: -3
    Enter value for A: -10
    Enter value for C: 1
    The answer to the Quadratic Formula where B is -3.0 A is -10.0 and C is 1.0 is -0.5.
    BUILD SUCCESSFUL (total time: 11 seconds)
    Any and all help is very appreciated Thank you ahead of time side note I am new to this so If i posted this in a wrong way please let me know and I will fix it

  2. #2
    Super Moderator Norm's Avatar
    Join Date
    May 2010
    Eastern Florida
    Thanked 2,475 Times in 2,426 Posts

    Default Re: Quadratic formula

    What equations.formulas are you having problems writing java code for?
    There are many statements in the code that compute values. Which one of them is not computing the correct value? If you can't easily see, add a println() statement after every statement and print out the results. Compare that with the results you have computed manually. If you can't resolve the program's results for a statement with your results, copy the print out and paste it here and explain why you think there is a problem.
    If you don't understand my answer, don't ignore it, ask a question.

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