Arithmetics

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Finally we want to add a method getSolution to solve the quadratic equation. Since the number of solutions can be 0, 1 or 2, it returns an array of appropriate length: QuadraticEquation.java

The method computes the discriminant (i.e. the term under the square root) and arranges the terms according to the its sign.

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The standard class Math contains a lot of mathematical functions as static methods, e.g. sqrt (square root), sin or log.

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The main routine creates a QuadraticEquation from the input parameters and prints it, together with its solution: TestQuadraticEquation.java

To do this, it needs to know the number of solutions. This can be extracted directly from the result array:

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An array has an integer field length that contains the number of elements of the array.