readme

SSD6 pq1的原版正确答案

Data Lab Practical Quiz
Solutions for Instructors

- bits.c contains the solution. There is a backup in bits-solve.c.

- You can build your solution btest.exe file in VC++ 
using the dlab.dsw workspace.

- btest.exe tests your procedures for correctness by running a number
of test cases.  It does not guarantee exhaustive evaluation.  In
addition, it does not check your code for compliance with the coding
guidelines.  You will have to do that manually.

Here are the command line options for btest:
   -e N     Limit number of errors to report for single function to N
            (Default unbounded)
   -f Name  Check only the named function
   -g       Prints concise report (implies -v 0 and -e 0)
   -h       Print the list of options
   -v N     Set verbosity to level N
            N=0 Only give final scores
            N=1 Also report individual correctness scores (default)


- To grade the student's handins, you have two options.  

Option 1: You can manually copy each student's solution to bits.c in
this directory, rebuild the btest.exe driver, and then run it with the
"-g" option.  This will produce a summary of the correctness score.

Option 2: If you have Perl and Cygwin, you can run the
grade-datalab.pl script on each student bits.c file. This will
automatically copy everything to a temp directory, compile and link
the student's bits.c file, run the resulting btest.exe file, and
output a grade report on stdout.

- To grade the student's handins, you have three options.  

Option 0: Do it by hand: Manually view each puzzle solution and try to
determine whether it is correct or not.

Option 1: Use the btest.exe driver: Copy each student's solution to
bits.c in this directory, rebuild the btest.exe driver, and then run
it with the "-g" option.  This will produce a summary of the
correctness score.

Option 2: Use the grade-datalab.pl autograder: If you have Perl and
Cygwin, you can run the grade-datalab.pl script on each student bits.c
file. This will automatically copy everything to a temp directory,
compile and link the student's bits.c file, run the resulting
btest.exe file, and output a grade report on stdout. The script gets
the driver files (e.g., btest.c, btest.h, ...)  from the current
directory, unless told otherwise by the "-s" option. Type
grade-datalab.pl -h for a list of the arguments.

Example usage:

If you're running the script in its own directory, then use the -f
argument to give the arbitrary pathname to the student handin file you
want to test:

    grade-datalab.pl -f /home/droh/handins/lopez/bits.c

Otherwise, if you're running the script from outside its
directory, then you'll need to use the -s option to tell
the script exactly where to find the driver files. For example,
if the script is housed in directory ./solution, then you 
could invoke it as follows:

    ./solution/grade-datalab.pl -f /home/droh/handins/lopez/bits.c -s solution