Written by Chris Gregg, Lisa Yan, Jerry Cain and Nick Troccoli, based on documents by Julie Zelenski, Nick Bowman and others

Date/Time: Tuesday, May 6, 7-9PM PDT

Location: CEMEX Auditorium

Review Session: Sat. 5/3 1-2PM PDT in Hewlett 103
Zoom link (Stanford Zoom account required): click here
Slides (available 1-2 hours after session): click here
Video (available 1-2 hours after session): click here

Overview

The midterm exam is 2-hour, closed-book, closed-note, closed-computer pencil-and-paper exam. It is intended to gauge your comfort and facility with the course material so far, as well as assess your mastery of the course learning objectives. Since the course topics build on each other, confirming you have a solid grasp of the foundational material now ensures you are equipped to tackle the later concepts to come in the course.

The exam has a particular emphasis on material that was prominent in the lectures, assignments and labs.

The exam is strictly individual work.

During the exam, you may use/reference:

• a provided reference page of essential details such as prototypes for standard library functions (e.g., strcpy, strlen, malloc). This will be provided along with the exam, and you can find a PDF and HTML version linked further down on this page.
• scratch space; this will be built into the exam.

You are not permitted to use any other materials, such as printouts (notes, slides, code, practice exams, etc.), other textbooks, or electronic devices (computers, iPads, Kindles, calculators, music players, etc.).

The exam may be a mix of short answer, multiple choice, code reading, code writing, etc. questions. The exam may not mimic the structure of any past exams, but the exam will consist of questions that fairly exercise your understanding of the material covered in the course.

Course staff will be proctors at the exam to answer clarification questions.

There are practice exams from prior quarters below.

We know that a written exam is not the same as working with a compiler as you do on the myth machines, and we account for that in how we design and grade the exam. We are assessing your ability to think logically and use appropriate problem-solving techniques. We expect you to express yourself in reasonably correct C, but we will be lenient with errors that are syntactic rather than conceptual.

Please make sure to thoroughly read all information contained on this page to ensure you understand the midterm logistics, requirements and restrictions.

Logistics

Early Exit Policy

To minimize noise during the last portion of the exam, we are requiring that all students remain seated if present for the last 15 minutes of the exam. In other words, you may leave early if you finish prior to the "15 minutes left" mark, but once the "15 minutes left mark" hits, we will ask students to remain seated to minimize any noise for the remainder of the exam (restroom breaks are permitted, but we won't be able to allow students to leave early at that point).

Seating Assignments and Bag Policy

In order to ensure the integrity of the testing environment as much as possible, we are using an assigned seating system and requiring that any bags be placed at the front of the room during the exam.

• Assigned Seating: Beginning 1 week prior to the exam date, you may visit this link to view your seating assignment. This includes students with exam accommodations who are taking the exam in a separate location - this page will show your exam location and seat (if applicable - assigned seats are only used for the main exam room). We recommend stopping by your assigned room to locate your seat at least one day before the exam, and arriving to the exam room early on the day of the exam to give yourself plenty of time to find your seat. You'll be required to take the exam in your assigned room and seat. We also recommend taking a screenshot 📷 of your seating assignment just in case of last-minute technical hiccups accessing the site.

  • Do you need a left-handed desk in the main exam room to take the exam, or are you a remote/CGOE student who wants to take the exam in person? If so, please fill out the form linked at the top of this page.

• Bag Policy: During the exam, all bags must be placed at the front of the room. We recommend bringing only what you need to take the exam with you to the exam room - e.g. writing implement(s), water, etc. If you bring any electronic devices with you, we require that they be placed in a bag at the front of the room for the duration of the exam. This includes devices such as cell phones, smartwatches, calculators, etc.

Material Covered

The midterm is intended to assess your understanding of the content covered in the first half of the course. The coverage is through the topics relevant for lab4 and assign4 but not beyond (i.e., through generics, but the midterm will not cover assembly). Material on generics will be slightly less heavily emphasized than other topics as assign4 is not due until after the exam, and you are not required to have completed any of assign4 before the exam (though you are welcome to work on it for practice if you'd like!).

The priority is on material that figured prominently in the assignments, labs, lecture, and reading (this list is in order of decreasing emphasis).

We highly recommend revisiting the labs and assignments. Each of them contain post-task self-check questions at the end that you can use to review. The labs also have some extra problems you can use for practice. The K&R and B&O textbooks also contain many exercises if you want additional problems to work.

We'd love to see the discussion forum come alive in helping everyone make the most of this opportunity to review what we've covered so far and rock the midterm – this is a great place to ask and answer unresolved questions, discuss conceptual issues, share techniques and materials you are finding useful as preparation, and support and encourage each other.

Honor Code

The exam is to be completed individually and without any assistance from a partner or other students. Follow the Stanford Honor Code (see link on main course homepage) during the exam: submit only your own work, do not use unpermitted aids on the exam, and say something to the instructors or students in question to prevent any inappropriate activity conducted by others surrounding the exam.

Grading

For coding questions, the majority of the points are typically focused on the correctness of the code. However, there may be deductions for code that is roundabout, awkward or inefficient when more appropriate alternatives exist. We will reward the simple, direct approach for its good design decisions and such code will likely have fewer correctness issues, so the choice of appropriate design can have a large impact. For example, we expect you to leverage appropriate features from the standard libraries; re-implementing that functionality wastes your valuable time and introduces opportunity for error.

Note that certain problems may have certain constraints (such as only using certain material, etc.) that you must follow to earn full credit. These constraints are not intended to make things difficult; typically, we are trying to guide you in the direction of a more straightforward solution. If you disregard these instructions, you are likely to lose points, either for not meeting the problem specification and/or for errors introduced when attempting a convoluted alternative. We reserve the right to deduct points for extremely inelegant or inefficient code that dodges the spirit of the problem.

• You are not required to write #include statements. Please do not abbreviate any code (such as writing "x2" next to code to copy it twice). Abbreviated code will not be graded.
• For questions expecting code, pseudo-code (writing English sentences and phrases instead of code) will typically earn little to no points. For example, writing "In this part of the code, I want to open the file and read each line and print it" will not earn any points.
• You should include your answer, as well as any scratchwork, in the answer area for each problem. An answer to a problem not in the designated answer pages for that problem will not receive any credit.
• Unless otherwise specified, it is fine to write helper functions to implement the required behavior.
• Style and decomposition are secondary to correctness. Unlike the assignments where we hold you to high standards in all areas, for an exam the correctness of the answers dominates the grading. Decomposition and style are thus somewhat de-emphasized. However, good design may make it easier for you to get the functionality correct and may require less code, which takes less time and provides fewer opportunities for error. Comments are never required unless specifically indicated by a problem. When a solution is incorrect, commenting may help us determine what you were trying to do when we attempt to give partial credit.
• We are lenient on syntax. We won’t trouble you about most small syntax errors (forgetting semicolons or spaces, for example) as long as your intentions are clear. Having said that, beware that if your syntax errors cause ambiguity (e.g. very unclear curly braces), we might not get the correct meaning. Additionally, there are subtleties that matter immensely, e.g., a int** is just one character different than int*, yet there is a world of difference between the two!
• The majority of the points for a problem will be reserved for grading the critical core of the code. For example, if we ask you to write a function that processes a generic array, only a tiny fraction of the points will be allocated to tasks such as initializing the counter or iterating over the right bounds, while the bulk of the points will be gained or lost in the tricky details of whether you correctly handle the void *s. Being off-by-one in the loop is a tiny deduction, but being a level of indirection off or applying the wrong cast is a larger issue. Be sure to focus your attention accordingly!

There are practice exams from prior quarters below.

Downloads

Exam Reference Sheet:

Webpage | PDF
Note: the reference sheet will be included with the exam.

Practice Materials:

Guide for how to approach and succeed on CS107 exams.

Note that the practice exams below were given out after assign4 was completed, meaning they emphasized generics slightly more heavily than the midterm will.

Practice 1: PDF | Solutions
This was the midterm from CS107 Winter 2018. It was written as a 120 minute exam.

Practice 2: PDF | Solutions
This was the midterm from CS107 Fall 2018. It was written as a 110 minute closed-note paper exam.

Practice 3: PDF | Solutions
This was the midterm from CS107 Fall 2017. It was written as an 80 minute closed-note paper exam.

Practice 4: PDF | Solutions
This was the midterm from CS107 Fall 2024. It was written as a 120 minute closed-note paper exam.

Extra Practice Problems: PDF | Solutions
This is a compilation of additional practice problems from CS107 Fall 2017 for the various topics covered on our midterm.

Still More Practice Problems: PDF | Solutions
These are practice problems written in Winter 2021 by a former CS107 and CS107A CA, Andrew Benson. These were given out in preparation for the open-book open-resource mid-quarter assessment given that quarter.