AP CSA Unit 2: Selection and Iteration

AP CSA · Unit 2 · 12 Lessons

Unit 2: Selection and Iteration

Master conditional statements and loops. Understand the control structures that form the foundation of every algorithm you’ll write in AP CSA and beyond.

12 Lessons

~30% AP Exam Weight

96+ Practice Questions

All 12 Lessons

Lesson 2.1

Algorithms with Selection and Repetition

Compound Boolean Expressions

Code Mechanics

Lesson 2.6

Comparing Boolean Expressions

Implementing Selection and Iteration Algorithms

Code Mechanics

Lesson 2.10

Implementing String Algorithms

Informal Run-Time Analysis

Conceptual

Coding Exercises

Write real Java in the browser and submit it. Every exercise is graded against hidden test cases, and your score reports to your teacher automatically. 12 of 12 are open so far; the rest unlock as they are built.

2.1Algorithms with Selection and RepetitionExercise 1 →🔒 Exercise 2

2.2Boolean ExpressionsExercise 1 →🔒 Exercise 2

2.3if StatementsExercise 1 →🔒 Exercise 2

2.4Nested if StatementsExercise 1 →🔒 Exercise 2

2.5Compound Boolean ExpressionsExercise 1 →🔒 Exercise 2

2.6Comparing Boolean ExpressionsExercise 1 →🔒 Exercise 2

2.7while LoopsExercise 1 →🔒 Exercise 2

2.8for LoopsExercise 1 →🔒 Exercise 2

2.9Implementing Selection and Iteration AlgorithmsExercise 1 →🔒 Exercise 2

2.10Implementing String AlgorithmsExercise 1 →🔒 Exercise 2

2.11Nested IterationExercise 1 →🔒 Exercise 2

2.12Informal Run-Time AnalysisExercise 1 →🔒 Exercise 2

What you’ll learn in Unit 2

Write boolean expressions using relational and logical operators
Use if, if-else, and if-else-if statements to control program flow
Build while and for loops to repeat code efficiently
Implement selection and iteration algorithms (accumulator, counter, sentinel)
Trace and debug complex control flow including nested structures

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Also in this course

Unit 1 Using Objects and Methods 15 lessons · ~20% of exam Unit 2 Selection and Iteration 12 lessons · ~30% of exam You are here Unit 3 Class Creation 9 lessons · ~14% of exam Unit 4 Data Collections 17 lessons · ~35% of exam

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