In-class Examples List

CS 111 - Computer Science Foundations 1
Section 10 - CRN 42038 - TuTh 9:00am-10:20am
Fall 2026

Last modified: Thursday, October 29, 2026

Important Notes:

• This is merely a selection of files and examples, most of which were mentioned or used in the class (lectures and labs). It is not a comprehensive list, nor are all lectures and labs included. Formatting is generally minimal.

• Week 10 - Lecture 2, 2026-10-29 - intro to the C++ switch statement
  • 111lect10-2-projected.txt - In-class projections
    
    
  • 111lect10-2.cpp - our function from Week 10 - Lecture 2, tested in the main function at the end;
    • describe_grade - which includes two versions, one using the if-else-if pattern and one using a switch statement
  
  
• Week 10 - Lecture 1, 2026-10-27 - intro to the C++ if statement
  • 111lect10-1-projected.txt - In-class projections
    
    
  • 111lect10-1.cpp - our functions from Week 10 - Lecture 1, tested in the main function at the end:
    • abs_value - uses an if-else statement, and involves interval-style data
    • next_sound - C++ version of Week 4 - Lecture 2 Racket function next-sound, uses the if-else-if pattern, and involves enumeration-style data
    • porridge_pref - uses the if-else-if pattern, and involves interval-style data
    
    
  • simplest-if.pdf - simplest if statement syntax, and its semantics expressed as a flow-chart
  • if-else.pdf - if statement with optional else syntax, and its semantics expressed as a flow-chart
  • if-else-if-pattern.pdf - if-else-if pattern - an alternate approved indentation for a common use of "chained" if statements appropriate when choosing exactly ONE of 3 or more choices, and its semantics expressed as a flow-chart
  
  
• Week 9 - Labs, 2025-10-24 - another bit about the string class' + operator, a few more string class methods, review clicker questions, and a lab exercise
  • 111lab09-projected.txt - In-lab projected notes
  • A small selection of useful C++ string class methods
    
    
  • https://cplusplus.com/reference/string/string/ - cplusplus.com's reference page for the C++ string class
    
    
  • lab9.cpp
  • C++ "graphic design recipe helper" - as a color PDF - a C++ version of a more-graphical depiction of the Design Recipe
  
  
• Week 9 - Lecture 2, 2026-10-22 - discussion of some common errors related to bool expressions involving C++ relational operators; what is object-oriented programming; what is a class; what is a method of a class, and what is the syntax for calling it; some functions involving string class instances; intro to the string class + operator, and to its length method
  • 111lect09-2-projected.txt - In-class projections
    
    
  • clicker1.cpp - a little program demonstrating some common errors when writing bool expressions
    
    
  • 111lect09-2.cpp - includes two non-main functions, tested in the main function at the end; its main function also includes some additional playing-around with string operator + and method length
    • pretty_name
    • name_length
    
    
  • 111template.cpp - PASTE this first .cpp file template INTO a .cpp file in the CS50 IDE at https://cs50.dev
  • C++ "graphic design recipe helper" - as a color PDF - a C++ version of a more-graphical depiction of the Design Recipe
  
  
• Week 9 - Lecture 1, 2026-10-20 - continuing intro to C++; C++ identifier syntax; walked through designing two C++ (non-main) functions using the design recipe, including testing them in a main function; intro to the idea of a compiler (as compared to an interpreter); more CS 111 C++ coding standards, debugging tips, and more
  • 111lect09-1-projected.txt - In-class projections
    
    
  • 111lect09-1.cpp - includes two non-main functions, tested in the main function at the end
    • circ_area
    • grade_in_range
    
    
  • "Some Racket/C++ Comparisons" - (in tagged PDF)
    
    
  • 111template.cpp - PASTE this first .cpp file template INTO a .cpp file in the CS50 IDE at https://cs50.dev
  • C++ "graphic design recipe helper" - as a color PDF - a C++ version of a more-graphical depiction of the Design Recipe
  
  
• Week 8 - Labs, 2026-10-16 - Racket sendoff/celebration demos, review clicker questions, "walked through" a C++ example program, demo'd compiling and running it in the CS50 IDE, also demonstrating some useful bash shell commands for use in the CS50 IDE along the way, followed by a lab exercise
  • 111lab08-projected.txt - In-lab projected notes
    
    
  • demo.cpp - example C++ program that we "walked through" during lab - includes two functions: check_within and main
  • demo-out.txt - what the compiled program demo prints to standard output when that is redirected into a file
    
    
  • Week 8 Lab Exercise handout - (in tagged PDF) - includes instructions for setting up CS50 Integrated Development Environment (IDE) at https://cs50.dev/
  • lab8.cpp
  
  
• Week 8 - Lecture 2, 2026-10-15 - starting intro to C++; intro to C++ simple expressions and basic data types; intro to some of C++'s kinds of compound expressions; syntax of a C++ named constant; and definition of a C++ program
  • 111lect08-2-projected.txt - In-class projections
    
    
  • Some Racket/C++ Comparisons - in tagged PDF
  • http://en.cppreference.com/w/cpp/language/operator_precedence - C++ operator precedence chart
  
  
• Week 8 - Lecture 1, 2026-10-13 - Exam 1
  
  
• Week 7 - Labs, 2026-10-09 - recursive function discussion followed by a lab exercise
  • Week 7 Lab Exercise
  • "graphic design recipe helper" - as a color PDF - a more-graphical depiction of the Design Recipe
  
  
• Week 7 - Lecture 2, 2026-10-08 - no class, because instructor was at a conference
  
  
• Week 7 - Lecture 1, 2026-10-06 - review for Exam 1, and after class posted a completed version of function add-shape, another function allowing keystrokes to change a big-bang world, here a world whose type is a list of images
  • 111lect07-1-projected.txt - In-class projected notes
    
    
  • Exam 1 Review Suggestions (in tagged PDF)
  • Exam 1 Reference Page - (in tagged PDF) - this will be handed out along with Exam 1, and is posted in case it might be helpful as you make your optional handwritten page of notes
    
    
  • 111lect07-1.rkt - completes the function add-shape, which adds an image to a list of images based on a keystroke:
    • draw-images-randomly
    • grab-strings
    • and completed version of: add-shape
  
  
• Week 6 - Labs, 2026-10-02 - review clicker questions followed by a lab exercise
  • 111lab06-projected.txt - In-lab projected notes
    
    
  • Week 6 Lab Exercise
  • "graphic design recipe helper" - as a color PDF - a more-graphical depiction of the Design Recipe
  
  
• Week 6 - Lecture 2, 2026-10-01 - quick demo of Intermediate Student Racket's map function; a little more on BSL Racket's 2htdp/batch-io module; two more functions that "walk through" a list; and STARTED a function allowing keystrokes to change a big-bang world whose type is a list of images
  • 111lect06-2-projected.txt - In-class projected notes
    
    
  • map-demo.rkt - quick demo of Intermediate Student Racket's map function
    
    
  • IMPORTANT: after writing your tests for a function that "walks through" a list, actually PASTE IN the template for a function that "walks through" a list into your function body, then EDIT that template!
    
    
  • 111lect06-2.rkt - DrRacket Definitions window from class; includes trying out file input and file output, as well as two recursive functions and STARTING a function adding an image to a list of images based on a keystroke:
    • draw-images-randomly
    • grab-strings
    • just STARTED: add-shape
  
  
• Week 6 - Lecture 1, 2026-09-29 - intro to lists, continued; intro to template for a function that needs to "walk through" a list; examples of functions that use this to "walk through" a list; just started discussing Racket module 2htdp/batch-io, which provides some functions for file input and file output
  • 111lect06-1-projected.txt - In-class projected notes
    
    
  • IMPORTANT: after writing your tests for a function that "walks through" a list, actually PASTE IN the template for a function that "walks through" a list into your function body, then EDIT that template!
    
    
  • 111lect06-1.rkt - DrRacket Definitions window from lecture; includes recursive functions:
    • len
    • add1-list
  
  
• Week 5 - Labs, 2026-09-25 - changing the ticker's speed for a big-bang expression; review clicker questions followed by a lab exercise
  • 111lab05-projected.txt - In-lab projected notes
    
    
  • Week 5 Lab Exercise
  • "graphic design recipe helper" - as a color PDF - a more-graphical depiction of the Design Recipe
  
  
• Week 5 - Lecture 2, 2026-09-24 - "throwing" your own errors in BSL Racket; finished example of a function driven by itemization-style data; concept of a data structure; started discussion of our first data structure, the BSL Racket list type, and introduced several built-in functions that work with lists
  • 111lect05-2-projected.txt - In-class projected notes
  • 111lect05-2.rkt - DrRacket Definitions window from lecture; includes function:
    • completed version of double-it
  
  
• Week 5 - Lecture 1, 2026-09-22 - intro to big-bang's on-key clause; intro to itemization data, and describing such data using data definition comments
  • 111lect05-1-projected.txt - In-class projected notes
    
    
  • The penguin images used in today's examples: (originally from http://wallofgame.com/free-online-games/arcade/231/Parachute_Penguin_Shootout.html):
    • floating-penguin image
    • landed-penguin image
    
    
  • 111lect05-1.rkt - DrRacket Definitions window from lecture; includes functions:
    • (from Week 4 Lecture 2) draw-penguin-scene
    • change-elevation
    • started, not yet finished: double-it
  
  
• POST-Week-4-Lecture-2 EXTRA example - functions supporting a big-bang world of type string
  • See Canvas Modules, CS 111 Recordings, for Zoom recording walking through creating the functions below
    
    
  • f21-111lect04-2-extra-string-world.rkt - DrRacket Definitions window from recorded example; includes the functions:
    • draw-string-world
    • next-sound - copied here, because used in an example expression here
    • change-world-string
    • time-to-quit?
  
  
• Week 4 - Labs, 2026-09-18 - review clicker questions followed by a lab exercise
  • 111lab04-projected.txt - In-lab projected notes
    
    
  • Week 4 Lab Exercise
  • "graphic design recipe helper" - as a color PDF - a more-graphical depiction of the Design Recipe
  
  
• Week 4 - Lecture 2, 2026-09-17 - review of BSL Racket cond expression; another example of refactoring; "falling" penguin example using cond; discussion of interval-style data and enumeration-style data; walked through an example using enumeration-style data
  • 111lect04-2-projected.txt - In-class projected notes; now also includes descriptions of interval-style and enumeration-style data
    
    
  • The penguin images used in today's examples: (originally from http://wallofgame.com/free-online-games/arcade/231/Parachute_Penguin_Shootout.html):
    • floating-penguin image
    • landed-penguin image
    
    
  • 111lect04-2.rkt - DrRacket Definitions window from lecture; includes functions:
    • cyan-star (copied from Week 2 Lecture 2)
    • cyan-star-scene (copied from Week 4 Lecture 1 version)
    • bad-star-size?
    • draw-penguin-scene
    • next-sound
  
  
• Week 4 - Lecture 1, 2026-09-15 - intro to Boolean operations and, or, and not; what is refactoring; intro to BSL Racket's cond (conditional/branching) expression; intro to big-bang function's stop-when clause
  • 111lect04-1-projected.txt - In-class projected notes
  • 111lect04-1.rkt - DrRacket Definitions window from lecture; includes functions:
    • cyan-star (copied from Week 2 Lecture 2)
    • cyan-star-scene (REFACTORED a bit from Week 3 Lecture 2 version)
    • banana-report
  
  
• Week 3 - Labs, 2026-09-11 - review clicker questions, and a lab exercise
  • 111lab03-projected.txt - In-lab projected notes
    
    
  • Week 3 Lab Exercise
    
    
  • "graphic design recipe helper" - as a color PDF - a more-graphical depiction of the Design Recipe
  • "Some DrRacket Tidbits" (in tagged PDF)
  
  
• Week 3 - Lecture 2, 2026-09-10 - intro to Racket's scene data type; example using the design recipe to write a function that returns a scene instance; intro to the big-bang function from the module 2htdp/universe
  • 111lect03-2-projected.txt - In-class projected notes
  • 111lect03-2.rkt - DrRacket Definitions window from lecture; before several examples of compound expressions using big-bang at the end, it also defines the functions:
    • cyan-star (copied from Week 2 Lecture 2)
    • cyan-star-scene
  
  
• Week 3 - Lecture 1, 2026-09-08 - intro to testing function check-within; some more useful Racket built-in functions; intro to the concept of scope of an identifier; two more examples of designing functions using the design recipe: humboldt-logo and doubt-it
  • "graphic design recipe helper" - as a color PDF - a more-graphical depiction of the Design Recipe
    
    
  • 111lect03-1-projected.txt - In-class projected notes
  • 111lect03-1.rkt - DrRacket Definitions window from lecture; includes functions:
    • humboldt-logo
    • doubt-it
  
  
• Week 2 - Labs, 2026-09-04 - review clicker questions and a lab exercise
  • 111lab02-projected.txt - In-lab projected notes
    
    
  • Week 2 Lab Exercise
    
    
  • "graphic design recipe helper" - as a color PDF - a more-graphical depiction of the Design Recipe
  • "Some DrRacket Tidbits" (in tagged PDF)
  
  
• Week 2 - Lecture 2, 2026-09-03 - review of identifiers; review of named constants; intro to check-expect; intro to writing your own functions using the DESIGN RECIPE
  • 111lect02-2-projected.txt - In-class projected notes
    
    
  • 111lect02-2.rkt - DrRacket Definitions window from lecture; includes our first Racket functions written using the design recipe:
    • triple
    • cyan-star
  
  
• Week 2 - Lecture 1, 2026-09-01 - more examples of built-in Racket functions that can be used in compound expressions; mentioned our first CS 111 class style standards; intro to function signature and purpose statement comments; started intro to identifiers, and our first kind of identifier, a named constant
  • 111lect02-1-projected.txt - In-class projected notes
  • 111lect02-1.rkt - DrRacket Definitions window from lecture
  
  
• Week 1 - Labs, 2026-08-28 - practice clicker questions, intro to pair programming, and a lab exercise
  • 111lab01-projected.txt - In-lab projected notes
    
    
  • Week 1 Lab Exercise
  • "Some DrRacket Tidbits" (in tagged PDF)
  
  
• Week 1 - Lecture 2, 2026-08-27 - continued intro to DrRacket programming environment; definitions of syntax and semantics; four basic BSL (Beginning Student Level) Racket data types, and syntax for literal simple expressions of those types; intro to BSL Racket compound expressions
  • 111lect01-2-projected.txt - In-class projected notes
    
    
  • DISPLAY-ONLY HTML version of 111lect01-2_rkt.html from class;
    save and execute this version below ("Save Link As..." to get a copy on your computer, should then be able to double-click on that or open it from DrRacket to run it):
    111lect01-2.rkt
  
  
• Week 1 - Lecture 1, 2026-08-25 - intro to course
  • CS 111 Course Syllabus (in tagged PDF) - includes tentative schedule
    
    
  • 111lect01-1-projected.txt - In-class projected notes (built from whiteboard notes after class because of laptop-projecting issue)

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