Columnar Transposition Cipher
Implement a program that encrypts messages using the columnar transposition cipher.
Substitution
Implement a program that encrypts messages using the substitution cipher.
String Practice
Practice with strings…
Array Practice: Hours
Practicing with arrays…
Credit
Validating credit cards…
Cash
Making change…
Mario: Less comfortable
Mario: More comfortable
Hello
A simple assignment to practice testing and submitting your code.
Welcome
Welcome to AP Computer Science Principles for 2025-2026! Read this to get started.