CSE 109    Progam 6    Due   9 PM Monday 7 April 2008
     Late collections 9 PM 8,9 April 2008

     Modify program 5 so that it generates sml code that corresponds to
     the given YAPL program, provided the given YAPL program is
     syntactically correct.  The input to program 6 should be a file
     consisting of YAPL language statements, finishing with "end", the "end"
     possibly followed by text that should be appended after the 'END' in the
     corresponding sml program.  Program 6 should have two output files,
     the first containing the results of the parse, and the second the sml
     code, followed by 'END'.  If the input file has text after "end" then
     the text should simply be appended to the sml code in the second file
     after the 'END'.  Thus, the second output file should be suitable as an
     input file to sml.

     For example, below I list a YAPL program and the sml code that
     yapl generated for that program (NOTA BENE: THE SML CODE THAT YOUR
     SOLUTION TO p6 GENERATES NEED NOT BE IDENTICAL TO THIS CODE, BUT IT
     MUST LEAD TO THE SAME OUTPUT WHEN THE CODE IS RUN IN SML.)
       read x
       goto 100 if x < 0
       write x
     100
       halt
       end
       5

     10019     [0]
     20017     [1]
     20019     [2]
     21999     [3]
     20017     [4]
     21998     [5]
     20999     [6]
     31998     [7]
     41011     [8]
     20018     [9]
     40012     [10]
     20017     [11]
     42016     [12]
     20019     [13]
     21999     [14]
     11999     [15]
     43000     [16]
     0     [17]
     1     [18]
     0     [19]
     END
       5

     To submit your assignment, create a subdirectory of /cse109.081 called
     p6 (that is, from your root directory cse109.081/p6) for doing your
     work.  Finally, indicate you wish the assignment to be collected by
     executing the unix command "touch DONE", which will create a file of
     0 bytes named DONE.  Then all files in the subdirectory p6 (but not
     in subdirectories of the subdirectory p6) will be collected.  I will
     test your program using your Makefile.  Some of the test files for
     p6 have been stored in /proj/csc109/p6.

     As always I warn you to heed my admonition that you not unfairly
     collaborate.  To understand what it means to unfairly collaborate
     read the course syllabus.