**'edu.rit.numeric.Cubic'**Java class

## Class Cubic

- java.lang.Object
- edu.rit.numeric.Cubic

public class Cubicextends Object

Class Cubic solves for the real roots of a cubic equation with real coefficients. The cubic equation is of the form*ax*^{3}+*bx*^{2}+*cx*+*d*= 0To solve a cubic equation, construct an instance of class Cubic; call the Cubic object's

`solve()`method, passing in the coefficients*a*,*b*,*c*, and*d*; and obtain the roots from the Cubic object's fields. The number of (real) roots, either 1 or 3, is stored in field`nRoots`. If there is one root, it is stored in field`x1`, and fields`x2`and`x3`are set to NaN. If there are three roots, they are stored in fields`x1`,`x2`, and`x3`in descending order.The same Cubic object may be used to solve several cubic equations. Each time the

`solve()`method is called, the solution is stored in the Cubic object's fields.The formulas for the roots of a cubic equation come from:

E. Weisstein. "Cubic formula." From

*MathWorld*--A Wolfram Web Resource. http://mathworld.wolfram.com/CubicFormula.html

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