/**
* Convenience function which enables +,-,*,/,% operators.
*/
public void enableArithmeticOperators() {
enableOperator(new AdditionOperator(operations));
enableOperator(new SubtractionOperator(operations));
enableOperator(new MultiplicationOperator(operations));
enableOperator(new DivisionOperator(operations));
enableOperator(new ModulusOperator(operations));
}