Quadratic
edu.rit.numeric

Class Quadratic



  • public class Quadraticextends Object
    Class Quadratic solves for the real roots of a quadratic equation with real coefficients. The quadratic equation is of the form

    ax2 + bx + c = 0

    To solve a quadratic equation, construct an instance of class Quadratic; call the Quadratic object's solve() method, passing in the coefficients a, b, and c; and obtain the roots from the Quadratic object's fields. The number of (real) roots, either 0 or 2, is stored in field nRoots. If there are no roots, fields x1 and x2 are set to NaN. If there are two roots, they are stored in fields x1 and x2 in descending order.

    The same Quadratic object may be used to solve several quadratic equations. Each time the solve() method is called, the solution is stored in the Quadratic object's fields.

    The formulas for the roots of a quadratic equation come from:

    E. Weisstein. "Quadratic equation." From MathWorld--A Wolfram Web Resource. http://mathworld.wolfram.com/QuadraticEquation.html

    • Field Summary

      Fields 
      Modifier and TypeField and Description
      intnRoots
      The number of real roots.
      doublex1
      The first real root.
      doublex2
      The second real root.
    • Constructor Summary

      Constructors 
      Constructor and Description
      Quadratic()
      Construct a new Quadratic object.
    • Field Detail

      • nRoots

        public int nRoots
        The number of real roots.
      • x1

        public double x1
        The first real root.
      • x2

        public double x2
        The second real root.
    • Constructor Detail

      • Quadratic

        public Quadratic()
        Construct a new Quadratic object.
    • Method Detail

      • solve

        public void solve(double a,         double b,         double c)
        Solve the quadratic equation with the given coefficients. The results are stored in this Quadratic object's fields.
        Parameters:
        a - Coefficient of x2.
        b - Coefficient of x.
        c - Constant coefficient.
        Throws:
        DomainException - (unchecked exception) Thrown if a is 0; in other words, the coefficients do not represent a quadratic equation.
      • main

        public static void main(String[] args)                 throws Exception
        Unit test main program.

        Usage: java edu.rit.numeric.Quadratic a b c

        Throws:
        Exception

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