Unit 7 - Arrays
Unit 7 (Arrays)
AP Computer Science 2021-22 / Dr. Kessner
Reading
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Eck Section 7.1 (Arrays) http://math.hws.edu/javanotes/c7/s1.html
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Wikibooks Java - Arrays https://en.wikibooks.org/wiki/Java_Programming/Arrays
Codingbat practice
- arrayCount9
- arrayFront9
- array667
Code
Make sure to write full unit tests for these functions.
Count lucky
A number is lucky if it is a multiple of 7 or ends in 7. Write a function that counts the number of lucky numbers in an array of integers.
countLucky({1, 2, 3}) -> 0
countLucky({7, 13, 17}) -> 2
countLucky({107, 207}) -> 2
Sum of squares (array)
Write a function that takes a single array of doubles as input, and returns the sum of squares of the values.
sumOfSquares({0}) -> 0
sumOfSquares({1.0, 2.0, 3.0}) -> 14.0
sumOfSquares({2.0, 2.0, 2.0}) -> 12.0
Total Z name length
Write a function that takes an array of strings as input, and returns the total length of the strings that start with “z” or “Z”.
countZNames({"Dr. Kessner", "Dr. Sands"}) -> 0
countZNames({"Zorro", "zero", "zippy"}) -> 14
Project
It’s time to start planning and prototyping your coding project!
Your project can be any interactive animation or video game using the Processing libraries.
Your goals for the week:
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Start your project! Make a folder, and get some code running, even if it’s just a title screen and a bouncing ball.
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Make sure you understand how to use the Processing libraries in your program. In particular, you will need to understand how to write classes that call the Processing functions via a PApplet reference.
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Play around with some ideas.