// isOperator returns true if token is an operator
isOperator returns true if token is an operator
// isOperator returns true if token is an operator
func isOperator(token string) bool {
	for _, v := range operators {
		if v == token {
			return true
		}
	}
	return false
}
func isOperator ( token string ) bool { for _ , v := range operators { if v == token { return true } } return false }
isOperator returns true if token is an operator
isOperator returns true if token is an operator