Lab 1 - Data Lab: Manipulating bits

• Lab 1 is available in directory /afs/cs.cmu.edu/academic/class/15213-f02/L1.

• Enter the Data Lab "Beat the Prof" Contest!

  • If you think you've done pretty well on Lab 1, then you can enter the "Beat the Prof" contest, where you try to meet or beat the number of operators that your instructors needed for their solutions. If all of your entries meet or beat your instructors, then you're a winner!

  • You get no points if you win, but you will be forevever immortalized in a Wall of Fame on the course Web page.

  • To enter the contest, login to a Linux machine (Andrew or Fish) and copy /afs/cs/academic/class/15213-f02/L1/submit.pl to your archlab-handout directory (the one with your bits.c, btest, and dlc files). Then run the script from any Linux machine by typing submit.pl.

  • The "Team" name reported on the web page is the name field (the first field) in the team struct in your bits.c file. If you want to be anonymous, change this field to whatever you want (as long as it's tasteful) before submitting your entry.

  • View the contest winners.

• IMPORTANT NOTE: Submitting a contest entry is not a substitute for handing in your assignment. You must still hand in your assignment, as described in the lab writeup.

Announcements

• [Sept 3, 1:30pm]: The max operator count for the bitMask function has been increased from 8 to 16. You can get the updated handout files from /afs/cs.cmu.edu/academic/class/15213-f02/L1/datalab-handout.tar. If you've already started working on your bits.c file, be sure to make a backup copy, as expanding the tarfile will overwrite your existing bits.c file.

General Suggestions

• Be sure to use the dlc compiler to check for compliance with the coding rules and to check your operator counts.
• Please read the coding rules in bits.c carefully. When in doubt, run dlc on your bits.c file.

FAQ

• Q: How come I get the following strange output when I run dlc on an Andrew machine?

  linux> dlc bits.c
  bits.c:1: unrecognized line: '/* '
  No mail was sent to the distribution list.
  

  A: You're actually running another binary on Andrew called /usr/local/bin/dlc, which you can verify using the which command:

  linux> which dlc
  /usr/local/bin/dlc
  

  You need to tell the shell to look for your program in the current directory (denoted by a "."). You can do this explicitly by typing the full pathname:

  linux> ./dlc bits.c
  

  or implicitly by putting "." at the end of your search path. See the Unix FAQ on the CS:APP student site for a description of how to modify your path.