Logistics

  • Due: Friday, March 28th AoE.
  • Submission instructions: ensure that you have the eight files for this assignment in your ~/csci112_spring2025/labs/lab9 directory, and that the snapshot (commit) of your repository containing the version of that file you want us to grade has been committed and tagged as lab9. (You should have set up your git repo and practiced tagging a commit in Classwork 4.)

Outside resources

On this assignment, you may not use the internet or generative AI such as ChatGPT to solicit solutions to the programming part of the assignment. If you are having trouble writing your program, please go to lab (Fridays, 10am-4pm in Barnard 254) or post in Slack to get help.

However, you may use those resources for help with navigating the Linux terminal, using vim, and using git, although you may get better answers to your questions by going to lab or posting on Discord anyway.

Learning outcomes

  • Practice splitting a C program into separate files.
  • Practice writing a Makefile.
  • Practice compiling a C program with make.

Assignment

In this lab, you split your Lab 8 solution into multiple header (.h) and source code (.c) files. You will also write a Makefile so that you can recompile only code that is affected by a change.

Note: you should not need to write any new code in this assignment, except perhaps function prototypes. If you use your own Lab 8 solution (or solution in /public/labs/lab9/solution.c) and you don’t have functions for sorting or any additional utility functions, you can add those so that you have things to put in the sorting and utility files described below. But you should not change the functionality of the program.

Files

You will need eight total files for this assignment.

  • lab9.c should contain your main function and no other C code. (It should also contain some #include preprocessor directives.)
  • county.h should hold the County struct definition and function prototypes for any county-related functions; at minimum, it should have a function prototype for add_county.
  • county.c should contain the definition of any functions in county.h.
  • sort.h should contain function prototypes for any sorting-related functions. If you are using your Lab 8 solution, these are get_min_in_range and sort.
  • sort.c should contain the definitions of any functions in sort.h.
  • utils.h should contain prototypes for any extra “utility” functions. If you are using the provided Lab 8 solution, these are menu, find_seat, and find_range.
  • utils.c should contain the definitions of any functions in utils.h.
  • Makefile should provide a set of rules for compiling your program.

Header guards

All .h files should include header guards.

Makefile

Your makefile should encode the dependencies of your program and result in a final executable called lab9. If you used the Lab 8 solution, your dependencies are:

  • the Lab 9 executable lab9 depends on object files compiled from lab9.c, sort.c, county.c, and utils.c.
  • the lab 9 object file depends on lab9.c and county.h
  • the sort object file depends on sort.c and sort.h
  • the county object file depends on county.c and county.h
  • the utils object file depends on utils.c, utils.h, and county.h

Hints

Grading–100 points

  • 10: all eight files exists with correct name in correct location
  • 20: make compiles lab9 without warnings
  • 20: lab9 still works as Lab 8 (passes tests from Lab 8 autograder)
  • 10: all header files have header guards
  • 10: lab9.c contains main and no other source code
  • 5 each: county.c defines functions in county.h, sort.c defines functions in sort.h, utils.c defines functions in utils.h.
  • 10: Makefile encodes the dependencies of the program so that only code that needs to be recompiled is recompiled
  • 5: county.h contains the definition for a County struct

Autograder

You can run the autograder using

/public/labs/lab9/autograder.sh

A detailed breakdown of your score will be present in autograder.txt.

Grading turnaround

Scores will be uploaded to D2L by class time the Monday after the due date.