Use a two-dimensional array to store test grades.
<UL>
<LI> <A HREF='GradeBook.h'>GradeBook.h</A> - definition of class
GradeBook
<LI> <A HREF='GradeBook.cpp'>GradeBook.cpp</A> - implementation of
member functions.  Note that when calling getAverage(),
the argument "grades[ student ]" is a one-dimensional array.
<LI> The <A HREF='fig07_24.cpp'>main program</A> creates a GradeBook object
using a two-dimensional array, then invokes member function
"processGrades" to analyze them.
</UL>