This directory contains a version of the stack development with
the following components:

stack.h:    array-based stack data type
stack.c:    empty_stack(), isempty(), depth(), push() and destroy_stack()
            implemented, stubs for the rest.
test1.c:    first test case using CHECK_* macros
test2.c:    second test case using CHECK_* macros
Makefile:   fully functional Makefile to compile and test test1 and test2
checker:    fully functional perl script
bool.h:     basic boolean type
check.h:    the CHECK_* macros

RESULT:     test1 still passes, test2 fails due to top()==-1 stub.
