Method isOperator

java/Chapter 9/Question9_11/Question.java:83–92

(char c)

	}
	
	public static boolean isOperator(char c) {
		switch (c) {
		case '&':
		case '|':
		case '^':
			return true;
		default:
			return false;
		}
	}
	
	public static String insertParensAround(String expression, int ind) {
		int left = 0;