Classwork 12

Logistics

  • Due: Monday, March 6th AoE.
  • Submission instructions: make sure that the required file (sum_and_average.c) is in your /classwork/week8/mon/ directory.
  • Deadline reminder: after the deadline passes, you cannot earn any points for this assignment.

Learning outcomes

  • Practice using pointers to pass by reference.

Assignment

  • Log in to the server.
  • From your home directory, navigate to classwork/week8/mon/, creating directories week8 and mon if necessary.
  • Copy the file /public/classwork/sum_and_average.c to your current directory. That is, run
      cp /public/classwork/week8/mon/sum_and_average.c .
  • In sum_and_average.c, complete the sum_n_average function so that it assigns the sum and and average of the array to the variables pointed to by sum and avg.
  • in main, call the sum_n_average function to compute the values for sum and average.

Hints

  • You can check that you will get full credit for this assignment by compiling your program, running it and saving its output to a file, and comparing that file to the example output. Specifically, do:
    gcc -o exe -Wall sum_and_average.c
./exe < /public/classwork/week8/mon/example_input.txt > output.txt
diff -w -i ~/classwork/week8/mon/output.txt /public/classwork/week8/mon/expected_output.txt

    You will see any warnings during compilation and any differences between your output and the expected output on the screen. If nothing happens, the content of your output file exactly matches the expected content and there were no warnings when compiling. As long as your file is in the correct place and named correctly, this means that you will get full credit for the assignment.

Grading turnaround

Preliminary results via autograder will be present in the appropriate classwork directory in the autograder.txt, refreshed every 5 minutes from 8am to 11am on the class day, and then every hour until 6am the following day. The 6am run is the final grade. Scores will be uploaded to D2L by the next class period.