Selection and Iteration — AP Computer Science A

2. Selection and Iteration

25–35% of the AP exam. Key topics: Boolean expressions using &&, ||, and !, De Morgan's Laws, if / else if / else branching, Nested conditionals, while loops and loop termination conditions, for loops and loop control variables, Infinite loop detection and prevention, String traversal using index-based loops with substring() and charAt(), Nested loops and their output patterns, Compound assignment operators: +=, -=, *=, Comparing loop structures for efficiency and clarity.

25–35% exam weight standard track

Unit 2: Selection and Iteration

Study guide content for this unit is being prepared. Check back soon for complete lesson notes, formula sheets, and worked examples.

Topics in this unit

Boolean expressions using &&, ||, and !
De Morgan's Laws
if / else if / else branching
Nested conditionals
while loops and loop termination conditions
for loops and loop control variables
Infinite loop detection and prevention
String traversal using index-based loops with substring() and charAt()
Nested loops and their output patterns
Compound assignment operators: +=, -=, *=
Comparing loop structures for efficiency and clarity