## Class Quadratic

- java.lang.Object
- edu.rit.numeric.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*ax*^{2}+*bx*+*c*= 0To 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 Type Field and Description `int`

**nRoots**The number of real roots.`double`

**x1**The first real root.`double`

**x2**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.

### 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*x*^{2}.`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.

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