Midterm Exam Information

Lightly modified from documents by Chris Gregg, Lisa Yan, and Nick Troccoli, based on documents by Julie Zelenski, Nick Bowman and others

Check Back Here Soon For More Details

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.
  • 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!

Downloads

Exam Reference Sheet:

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

Guide for how to approach and succeed on CS107 exams.

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.

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.

Practice Final 1: PDF | Solutions
This is based on the final exam from CS107 Winter 2018.

Practice Final 2: PDF | Solutions
This is based on the final exam from CS107 Fall 2017. It was written as a 180 minute paper exam (same length as this quarter).

Practice Final 3: PDF | Solutions
This is based on the final exam from CS107 Fall 2018. It was written as a 180 minute paper exam (same length as this quarter).

Extra Practice Problems: PDF | Solutions

Ethics Material Practice Problems: PDF | Solutions

You can do it!