CSci 1301: Takehome 1

Due: Monday, October 15th at 11:59pm (no late work accepted)

Total: 30 points

This is individual work. You are not allowed to spend more than 6 hours on this test. This includes any reading that you do to help you solve the problems.

Make sure to write your name in the file(s) you submit. You may submit one or two files.

Use helper functions as needed. All your functions must have a signature, a description, and, whenever possible, check-expect tests.

Comments, helpful variable names, and good code style and formatting are a very important part of your grade. You don't have to look for the shortest solution, but you should eliminate unnecessary code repetition if possible (use helper functions).

Task 1 (10 points): results of a vote

Write a function passed? that takes four strings, each of which can be "Yes" or "No" (in this exact capitalization). The function determines if a vote has passed based on the majority of four votes. The vote passes when strictly more than a half of the four votes is a "Yes". If two votes are "Yes" and two "no", the vote fails. The function outputs a boolean: #true if the vote passed and #false if it failed.
Below are some test cases. More test cases are needed. You don't need to test all possible combinations, but definitely add some tests.

      (check-expect (passed? "Yes" "No" "Yes" "Yes") #true)
      (check-expect (passed? "Yes" "No" "Yes" "No") #false)
      (check-expect (passed? "No" "No" "No" "No") #false)
  

Task 2 (20 points): fish animation

Your goal is to implement a swimming fish animation. Use this fish picture:
Its background color is cyan, so use Racket color "cyan" for the background scene. Implement your program step-by-step, add helper functions as needed. There is a lot of repetitive math computations, so use helper functions and constants to make your code clear and easy to manage.
The scene size is fixed: the width is 400, the height is 200.
You don't need to implement repeated motion (such as a cycle).
In order to make the fish picture smaller scale it to 0.5 in your program using Racket scale function.

• Implement animation in which the fish swims right to left on the screen, starting at the right hand side of the scene (so the fish is half visible on the right). The vertical position of the center of the fish is 120 pixels from the top.
• Change the animation so that the fish swims at the height as above for the first 100 clock ticks, then switches ("jumps" up; no smooth transition is required at this point) to the height of 80 pixels from the top for the next 200 clock ticks and then "jumps" back down to 120.
• Now you will implement smooth transition so taht the fish motion is as follows:
  • the fish swims straight at 120 pixels for the first 100 clock ticks,
  • it swims diagonally up for the next 100 clock ticks until it reaches the height 80> This is what the scene looks like in the middle of the transition:
    
    This is what it looks like when the fish is almost at the top:
    
    
  • after reaching the height of 80, the fish swims diagonally down to the height of 120 for the next 100 clock ticks:
    
    
  • For the remaining 100 clock ticks the fish again swims straight at the height 120.
• Extra credit (3 points): After you are done with the main part of the exam, if you have time, add a slight fixed angle rotation of the fish so that it is pointing up as it's swimming up and is pointing down as it's swimming down. You don't need a smooth transition to the rotation. Your scene would look like this:
  
  
  
  

If something is not working, please comment it out and write comments about why you think it's not working and how you would be going about fixing it if you had more time. Make sure that the code you submit runs, even if it doesn't implement all of the functionality.

Your work will be graded based on:

• design decisions (how conditionals are constructed)
• functionality,
• correctness (no errors, such as "all cases of cond were false";
• code quality (code structure, comments, naming, use of constants and helper functions, etc.)

Happy programming!

What to submit

Submit your solutions in one file on canvas. The file must be named with your last name. In a submission comment write the total time you spent on the test.

CSci 1301 course web site.