sstack.h contains initial code for a
"simple" stack class holding strings. You will extend it and write the
implementations in sstack.cpp,
using stacktest.cpp to test your
code.
This implementation uses an "inner" class, StackNode. Treat it
like a regular class - it's just private to StringStack. You
can modify both StringStack and StackNode in your
solution, as long as your implementation is based on linked lists.
Submit your code (sstack.h, sstack.cpp) to
Esubmit as ex6stack. Do not submit stacktest.cpp -
that is provided for you. The code will be graded for correctness only;
there are no style requirements. You may work with other students on this
exercise, but each must submit their own solution.