Slides: Makefiles and Multifile Projects

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# Makefiles and Multifile Projects
## CSC 161 – February 24, 2026

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# Agenda for Today
1. Upcoming Work
2. Discussion
3. Lab
4. Wrap Up

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# Upcoming Work

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# Week 6 Quiz
As usual, we'll have a quiz on Thursday.
The quiz will last 10 minutes, and will focus on:

1. Unsigned Integer Representation
2. Two's Complement Signed Integer Representation
3. Compiling Multifile Projects
4. Makefile Rules

Topics from Thursday's reading will not appear on this week's quiz, but please make sure you still read to prepare for our lab.

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# Homework: Connect Four
**Due:** Thursday, February 26th

## Questions
_None so far_

If you need to work on the assignment from off campus you can access a MathLAN session by going to <https://remote.cs.grinnell.edu>.

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# Discussion

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# Discussion: Multifile Projects
**Items for think, pair, share:**

1. What happens when you write `#include` in a C source file?

2. We generally put function implementations in source files rather than header files.
   Why do you think that is?

3. The following commands compile two source files to object files, then combine them into a single program:
```shell
clang -c source1.c
clang -c source2.c
clang -o program source1.o source2.o
```
   What is a single command that would do all these steps, and why might we prefer the three-command version?

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# Discussion: Makefiles
**Items for think, pair, share:**

1. Why do we use `make` and `Makefile`s?

2. Consider the following `Makefile` rule:
```make
game: game.c interface.h interface.c ai.h ai.c
        clang -o game game.c interface.c ai.c
```
   - What is the *target* in the rule above, and what does it mean?
   - What is the *recipe* in the rule above, and what does it mean?
   - What are the *prerequisites* in the rule above, and what do they mean?

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# Lab

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# Wrap Up

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# Wrap Up

## Lab Work
Submit your completed *Farm Simulator* program with a working `Makefile` as part of your lab report for this week.
You can submit the `Makefile` you produce in part B or any later part of the `Makefile` lab.

## Reading

- **Testing** 
              
            
              
- **Beej's Quick Guide to gdb**