private int getPrecedence(TokenOperator token) {
		int precedence = 0;

		String original = token.getOriginal();
		if (original.equals("*")) {
			precedence = 1;
		} else if (original.equals("/")) {
			precedence = 1;
		} else if (original.equals("+")) {
			precedence = 2;
		} else if (original.equals("-")) {
			precedence = 2;
		}

		return precedence;
	}