CMPT 212 Assignment 4 corrections

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 Some corrections for CMPT 212 assignment 4:

  1.  Besides the print-out of the window with List 1 showing, also
      hand-in a print-out of the window with List 2 showing.  It
      doesn't matter how many people are in List 2, although List 1
      should have the 3 people as described in Section 7b of the
      assignment description.

  2.  The "display" function in Student, Programmer, and Instructor
      should not be a pure virtual function.  That is, instead of
	 void display(char *) = 0;
      it should be
	 void display(char *);
      Note that the "display" function in Person is still a pure
      virtual function.

  3.  Here's a hint for how to change the check marks in the List
      menu:  try the function "CheckMenuItem" (look it up in the
      Windows API help in the Borland IDE).

   - Dave Simpson
     CMPT 212 instructor

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