Testing Class GradeBook
Figure 3.13 performs the same
GradeBook object manipulations as Fig. 3.10. Separating
GradeBook’s interface from the implementation of its member functions does not affect the way that this client code uses the class. It affects only how the program is compiled and linked, which we discuss in detail shortly.
As in Fig. 3.10, line 5 of Fig. 3.13 includes the
GradeBook.h header so that the compiler can ensure that
GradeBook objects are created and manipulated correctly in the client code. Before executing this program, the source-code files in Fig. 3.12 and Fig. 3.13 must both be compiled, then linked together—that is, the member-function calls in the client code need to be tied to the implementations of the class’s member ...