public class Quadraticextends ObjectClass 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
Fields Modifier and Type Field and Description
nRootsThe number of real roots.
x1The first real root.
x2The second real root.
Constructors Constructor and Description
Quadratic()Construct a new Quadratic object.
Methods Modifier and Type Method and Description
main(String args)Unit test main program.
solve(double a, double b, double c)Solve the quadratic equation with the given coefficients.
public int nRootsThe number of real roots.
public double x1The first real root.
public double x2The second real root.
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.
a- Coefficient of x2.
b- Coefficient of x.
c- Constant coefficient.
DomainException- (unchecked exception) Thrown if a is 0; in other words, the coefficients do not represent a quadratic equation.
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