private void checkArithmeticExpression() throws Exception {
		List<Token> expression = new ArrayList<Token>();
		
		while(iterator < tokenList.size() && isValidArithmeticElement(tokenList.get(iterator))) {
			expression.add(tokenList.get(iterator));
			iterator++;
		}

		ShuntingYard shuntingYard = new ShuntingYard(expression);
		expression = shuntingYard.run();
	}