CS 111 Homework 2 P 1

Cs 111 Homework 2 P 1cs 111 Homework 2

Write a comprehensive, well-structured academic paper that fulfills the following assignment requirements:

1. Utilize DrRacket with the language set to How To Design Programs - Beginning Student level, and ensure you include the HTDP/2e versions of the image and universe teachpacks at the beginning of your Definitions window. Also, incorporate your name, the course, the date of last modification, and a problem identifier comment. Provide specific definitions and comments for problems 1 through 7, covering constants, functions, signatures, purpose statements, headers, tests, and actual implementations as specified in the prompts.

2. For each problem, define named constants with descriptive names, adhere to coding style standards, and write clear, precise signature and purpose comments. Include multiple check-expect tests before or after function definitions, and ensure the functions behave correctly according to the tests.

3. In Problem 1, define a constant image matching a specific image of at least three image operations, verify its size with check-expect statements, and ensure it is 200x200 pixels. Modify the constant as needed based on test results.

4. For Problems 2 and 3, create functions with appropriate signatures and purpose statements, define headers with placeholder bodies, and write at least two specific tests. Then, implement the functions, test them, and provide example calls.

5. In Problem 4, define a function to overlay title text in black letters above an image, with suitable signature and purpose comments, header, tests, and implementation.

6. For Problems 5 and 6, define relevant constants for unit conversions and pricing, then develop functions to compute total inches from feet and inches, and total order price for coffee, including signature, purpose, tests, and final implementation using constants.

7. In Problem 7, create a function with parameters that returns an image, providing appropriate signatures, purpose text, header, tests, and implementation.

8. Ensure each of these functions is thoroughly tested with check-expect expressions, and include example calls to demonstrate functionality and correctness. Follow the course style standards, including descriptive naming, proper comments, and spacing.

9. Submit your file named 111hw2.rkt by transferring it to the appropriate directory on nrs-labs.humboldt.edu via secure methods, and execute the command to submit using ~st10/111submit, verifying that your file is correctly uploaded.

10. Contact your instructor via email if issues arise during submission, and show willingness to clarify or demonstrate the submission process during office hours or appointments.

Paper For Above instruction

Introduction

The purpose of this assignment is to develop proficiency in defining constants, writing functions with proper signatures and purpose statements, and applying the design recipe in Racket programming within the context of the course CS 111. The assignment emphasizes clarity, style, and correctness, which are fundamental in building reliable and readable code. This comprehensive set of problems guides students through creating images, mathematical functions, string functions, and more, all adhering to style standards and testing rigorously with check-expect expressions.

Problem 1: Defining a Named Constant Image

The first step involves utilizing DrRacket to define a constant image based on prior homework. The image must meet specific size requirements — exactly 200 by 200 pixels — and be the result of at least three image operations from the teachpack. Students are expected to verify its dimensions through check-expect expressions that compare the image's width and height using image-width and image-height functions. Adjustments are made if the image does not meet size specifications.

Signature and Purpose Statements

The definitions must include descriptive signatures in comments, indicating the type of the image, for example, ; signature: my-image: image. The purpose statement should clarify what the image represents and the operations involved in its creation.

Problem 2: Function to Calculate Perimeter of a Square

This problem builds comprehension of function signature design and testing. Students decide how many and what types of parameters (most likely a single number for side length) are needed, then write an appropriate signature and purpose statement. A placeholder header ((define (perimeter-square side)) is provided, with initial tests using check-expect expressions. The function body is filled in with the perimeter calculation (4 times the side length), and tested until correct. Example calls demonstrate its correctness.

Problem 3: String Function for Asking a Person How Their Day is Going

This problem involves defining a function that takes a person's name as input and returns a personalized question string, such as "How's it going, Alice?". The function's signature, purpose statement, header, tests, and implementation are to be written step-by-step, emphasizing clarity and correctness. Example calls illustrate expected output.

Problem 4: Creating a Title-Bed Image

The task is to define a function that takes a title string and an image, and returns a new image with the title text in 25-pixel-high black letters displayed above the original image. The function signature should clearly state the parameters and return type. The purpose statement describes the function's intent. Tests check its output, and the implementation uses the image and text creation functions from the teachpack.

Problem 5: Calculating Total Inches from Feet and Inches

Students first define a constant IN-PER-FT representing inches in a foot. Then, they write a function total-inches that multiplies feet by this constant and adds inches. Tests verify correctness using different input values, emphasizing the use of the constant. The final implementation should correctly compute the sum of total inches, demonstrating understanding of constants and arithmetic operations in functions.

Problem 6: Calculating Coffee Order Price

Constants for coffee price per pound, shipping per pound, and overhead are defined. The function order-price computes total cost based on weight, using these constants—this highlights applying constants within a function's body. Tests with sample inputs (e.g., one pound, multiple pounds) verify correct calculations. The implementation integrates these constants into the formula, and example calls showcase the function in action.

Problem 7: Creating an Image-Generating Function

The last problem encourages students to invent a new function that takes parameters and returns an image. They must define signature, purpose, header, tests, and implementation, fostering creativity and mastery of image functions. Example calls help demonstrate functionality, completing the assignment requirements.

Conclusion

This assignment provides a comprehensive review of key programming concepts in Racket, including defining constants, writing signature and purpose comments, designing and testing functions, and working with images. The rigorous testing, style adherence, and attention to detail cultivate good programming habits essential for further coursework and professional development. Proper submission, with verification of file transfer and adherence to naming conventions, completes the process.

References

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