CS141 programming assignment 2, due Monday May 3, 10am; assigned
Monday April 25.

Your job is to complete the files Digraph.h and Digraph.cc.  These
files should implement a directed graph class.

The provided files Graph.h and Graph.cc implement a graph class
(undirected) using the Digraph class.  They should work as they are,
provided the Digraph class is implemented correctly.

The subdirectory ./Include contains complete implementations of the
Array, AssocList, and HashTable classes, as well as some other header
files.  Feel free to replace these files with files of your own if you
prefer.

If you write code that calls "exit()" in response to a run-time error,
I suggest you instead call the procedure die(char *msg), which will
print the error message (with a line and file number) and send a
signal to kill the program.  (The signal is useful in case you are
using the debugger, which will catch the signal and stop the program
before it exits.)  The procedure die() is defined in the #include file
"test_utilities.h" .

turn in:

     Turn in at least the files Digraph.cc and Digraph.h.  You may
     also turn in any other files in this directory, or the Include
     directory, if you have modified the files and you want to use the
     modified ones.  For any files you turn in, make sure you turn
     them in with the same names and locations as are provided here.

grading and testing:
   
     Test your code using the supplied test routines test_digraph and
     test_graph programs in the ./Test subdirectory.  When you turn in
     your code, these will be automatically compiled, using the other
     files that you have turned in, and run.  Your grade will then be
     determined by the TA looking at the output of these two programs.
     To get a non-zero grade for prog assignment 2, these programs
     must compile with your code.

questions to neal@cs.ucr.edu