Computer Science Programming Tutorials
In Introduction To Java Programming

Exercise 3.1 – Algebra: Solve Quadratic Equations

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The program below is the answer to Liang’s Introduction to Java Programming (9th Edition) Chapter 3 Exercise 3.1.

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/**<br /> *<br /> * @Author: Aghatise Osazuwa<br /> * Website: www.cscprogrammingtutorials.com<br /> * Exercise 3.1 - Algebra: Solve Quadratic Equations<br /> */<br />import java.util.Scanner;<br /><br />public class CheckerboardPatternOfAsterisks {<br />    public static void main (String [] args) {<br />        <br />        // declare variables<br />        double a, b, c, disc, r1, r2;<br />        <br />        // create Scanner to read user input<br />        Scanner input = new Scanner(System.in);<br /><br />        // prompt user to enter details<br />        System.out.print("Enter a, b, c: ");<br />        a = input.nextDouble();<br />        b = input.nextDouble();<br />        c = input.nextDouble();<br /><br />        //calculate the discriminant<br />        disc = b * b - (4 * a * c);<br />        <br />        //calculate the roots<br />        r1 = (-b + Math.pow(disc, 0.5)) / (2 * a);<br />        r2 = (-b - Math.pow(disc, 0.5)) / (2 * a);<br /><br />        // display the results<br />        if (disc &gt; 0){<br />                System.out.println("The roots are " + r1 + " and " + r2 + "n");<br />        }<br />        <br />        if (disc == 0){<br />                System.out.println("The root is " + r1 + "n");<br />        }<br />        <br />        if (disc &lt; 0){<br />                System.out.println("The equation has no real roots.n");<br />        }<br />    }<br />}<br />

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