Section 18.3.4:
---------------

1)
Inconsistent highlighting in examples:

	Employee::Employee(String employee_name, double initial_salary)
		: name(employee_name), salary(initial_salary)

Last line blue, but:

	TeachingAssistant::TeachingAssistant(String student_name)
		// Teaching assistants all get same starting salary
		: Employee(student_name, 5000)

is all the same color.

2)
The PartDescription class definition needs a semicolon


Section 18.5
------------
sharedstring.cpp:  declaration of SharedString::operator= (line 12) does
not match  defintion (line 48).  Return a reference, or a copy?
