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\par }{\fs16 Fall 2003
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\fs20\lang1033\langfe1033\cgrid\langnp1033\langfenp1033 {\b CS 131 - Intro to Computer Science I - Fall 2003
\par LAB #13 Exercise 
\par 
\par lab #13 exercise due: Friday, December 12th, END of lab
\par }\pard \s15\qc \fi-420\li420\ri0\nowidctlpar\aspalpha\faauto\rin0\lin420\itap0 {\b 
\par }\pard \s15\ql \fi-420\li420\ri0\nowidctlpar\aspalpha\faauto\rin0\lin420\itap0 {\b\ul LAB #13 EXERCISE}{\b 
\par }\pard \s15\ql \li0\ri0\nowidctlpar\aspalpha\faauto\rin0\lin0\itap0 {\b 
\par }{Consider the following files, available from the course web page's "Homeworks and Handouts" link along with this handout:
\par }{\b 
\par Student.h, Student.cpp}{: these declare and implement a class }{\b Student}{, remarkably similar to Student2.h and Student2.cpp declared and defined for the Week 14-2 lecture, except that it now also includes an overloaded }{\b == }{
operator. It also includes explicitly-defined copy constructor, destructor, and overloaded assignment (=) operators.}{\b 
\par 
\par Prof.h}{, }{\b Prof.cpp}{: these declare and implement a class }{\b Prof}{, remarkably similar to Prof from Homework #7, except that it now includes a no-argument constructor, includes an overloaded ==, and has had all floats changed to doubles. }{\b 

\par 
\par Course.h}{, }{\b Course.cpp}{: these declare and implement a class }{\b Course}{. A course has
 a number (such as "CS 131"), a name (such as "Intro to CS"), a number of students enrolled, a dynamic array of those Student's enrolled,  and an instructor (a Prof instance).  Note the following implementation details:}{\b 
\par 
\par }\pard \s15\ql \fi-405\li825\ri0\nowidctlpar\aspalpha\faauto\rin0\lin825\itap0 {*\tab in this world, no class can ever 
exceed 30 students. A named constant, ENROLLMENT_MAX, is used for this (in case this world changes its mind about what the max should be later...)
\par 
\par *\tab when the first student actually enrolls in a class, at that point a dynamic array of Students of size ENROLLMENT_MAX is created/
\par 
\par *\tab what keeps the program from thinking that every class with at least 1 student has ENROLLMENT_MAX students? The numEnrolled member variable: the class is careful to ONLY consider array elements from 0 to (numEnrolled-1) to be enrol
led Students,  and numEnrolled is only changed as students enroll or are removed from the course.
\par 
\par *\tab read the code to see what member functions it includes...
\par }{\b 
\par }\pard \s15\ql \li-15\ri0\nowidctlpar\aspalpha\faauto\rin0\lin-15\itap0 {\b test_Course.cpp}{
: some quick'n'sleazy (and incomplete!) tests of class Course; they DO show the effect of NOT having an explicit and appropriate = operator when a class has pointers or dynamic member variables.}{\b 
\par }\pard \s15\ql \fi-405\li825\ri0\nowidctlpar\aspalpha\faauto\rin0\lin825\itap0 {
\par }\pard \s15\ql \fi-420\li420\ri0\nowidctlpar\aspalpha\faauto\rin0\lin420\itap0 {\b 0.\tab }{For your convenience, I've created copies of the above files in }{\b ~st10/131lab13_public}{, also, for quicker copying into your working directory:
\par }{\b 
\par }{\tab }{\af2 cp ~st10/131lab13_public/*  .}{
\par }{\loch\af2 
\par \hich\af0\dbch\af0\loch\f2                                 }{^}{\loch\af2 
\par }{                                                                              |       remember, the dot is important! That's a nickname for
\par \tab \tab \tab \tab \tab \tab               your current working directory...
\par }{\b 
\par 1.\tab }{If you try to compile}{\b  Course.cpp}{ and  }{\b test_Course.cpp}{, you will see that they fail --- there are redefinition errors, because #include'd Course.h also #include's Student.h and Prof.h. But you know how to }{\b fix}{
 this, now: go into }{\b Student.h}{, }{\b Course.h}{, and }{\b Prof.h}{ and add those lovely }{\b #ifndef}{'s as discussed in lecture.}{\b 
\par 
\par }{\tab }{\b Recompile}{ Student.cpp, Course.cpp, and Prof.cpp, and now, }{\b recompile}{ test_Course.cpp. It should now work, and you should be able to execute }{\b test_Course}{
 and see its results, including the sad effect of its not having an explictly- and appropriately-designed = operator.
\par 
\par Add your name to the }{\b Next: }{list on the board, so that I can verify that }{\b test_Course }{indeed now can be run. (While you are waiting, it should be safe for you to proceed with #2...)
\par 
\par }{\b 2.\tab }{Now, modify }{\b Course.h}{ and }{\b Course.cpp}{ to add explictly- and appropriately-defined copy constructor, destructor, and overloaded = operator.  (Note: it is probably wise to ch
eck if enrolled is NULL, and act accordingly if so, for the copy constructor and = operator. And, for the = operator, what should you do if you are assigning to an existing Course instance with a non-NULL enrolled member variable?)
\par 
\par \tab When done, recompile }{\b Course.cpp}{ and at least re-link }{\b test_Course.cpp}{; you should now see that the copy assigned using = is now properly independent of what it was assigned from.
\par }\pard \s15\ql \li0\ri0\nowidctlpar\aspalpha\faauto\rin0\lin0\itap0 {\b 
\par }{When you are done, add your name to the}{\b  Next:}{ list on the board. When it is your turn, I will check your }{\b test_Course }{run results and will scan  your copy constructor, destructor, and overloaded =.}{\b 
\par }{
\par }{If, before the end of lab, your test_Course verifies that = produces an appropriate independent copy, and if the quick scan shows that your other modifications look reasonable, then you have successfully completed this lab exercise.
\par }{\b 
\par }{\b\ul 
\par }}