Polynomial Division

A library for polynomial division

Originally programmed in 2017 for school

API Documentation:

• First, add the Polynomdivision.jar as an external library to your project

• Then you have to import the class PolynomMain to use the lib methods and you also need the InvalidPolynomException if a polynom is invalid:

    import de.lakinator.polynomialdivision.PolynomMain;
    import de.lakinator.polynomialdivision.InvalidPolynomException;

After that you can call 3 static methods with this library:

• PolynomMain.getVersion() returns the library version:

  System.out.println("Library Version: " + PolynomMain.getVersion());

• PolynomMain.validateInput(String... input) checks if the given strings are valid polynoms and returns true if they are valid, but if one of them is invalid it throws an InvalidPolynomException:

  String polynom1 = "3x^2-4x+2";
  String polynom2 = "x-1";
  
  try {
    if(PolynomMain.validateInput(polynom1, polynom2)) {
      //See calculation below
    }
  } catch(InvalidPolynomException e) {
    //The error message
    System.out.println(e.getLocalizedMessage());
    //The index of the invalid polynom
    System.out.println(e.getIndexOfInvalidPolynom());
    //Or print them out together
    System.out.println(e.toString());
  }

  Note: If you don't validate your strings before you divide them, the variable that will be used in the output from calculation is default x. In certain circumstances the calculation step can throw an exception if one of the two Strings have a wrong polynom syntax

• PolynomMain.calculate(String polynom1, String polynom2, boolean fullOutput) returns the result as a String:

  //After the validation!
  String output = PolynomMain.calculate(polynom1, polynom2, true);
  System.out.println(output);

  fullOutput == true	fullOutput == false
  returns the fully formatted result of the division between polynom1 and polynom2	returns only the result of the division between polynom1 and polynom2

  fullOutput == true:
  
  +3x^2-4x+2 : +x-1 = +3x-1 + (+1/+x-1)
  -(+3x^2-3x)
  ------
  -x+2
  -(-x+1)
  ------
  +1
  
  
  fullOutput == false:
  
  +3x-1 + (+1/+x-1)