AP Computer Science A:: Iteration Flashcards (50 Cards) — Study Online

Curriculum Overview

Comprehensive, high-yield AP Computer Science A study deck focusing on Iteration. Features 50 rigorous, curriculum-aligned flashcards designed for intermediate-level mastery. Core concepts covered include Iteration, key problem-solving heuristics, foundational formulas, and exam-tested application scenarios. Ideal for active recall review, spaced repetition study, and scoring in the top percentile.

Topics & Key Concepts

Both Java LOOP This AFTER Given BEFORE System Science Computer

Sample Flashcard Questions & Answers

Showing 8 of 50 cards

Question #1 Active Recall

What is the general syntax of a Java \(while\) loop?

- **A)** \(loop\ (booleanExpression)\ \{\ statements;\ \}\)
- **B)** \(while\ \{booleanExpression\}\ statements;\)
- **C)** \(while\ statements;\ (booleanExpression)\)
- **D)** \(while\ (booleanExpression)\ \{\ statements;\ \}\), which repeats the statements as long as the boolean expression remains \(true\)

Answer & Explanation:

**Answer: D)**

A \(while\) loop checks its boolean condition BEFORE each iteration, continuing to repeat as long as that condition stays true.

Question #2 Active Recall

How many times does the loop body execute in \(int\ i = 0;\ while\ (i\

Answer & Explanation:

**Answer: D)**

The loop prints \(i\) for values 0, 1, 2, 3, 4 -- exactly 5 iterations -- before \(i\) reaches 5 and the condition becomes false.

Question #3 Active Recall

What is an INFINITE LOOP, and what commonly causes one?

- **A)** A loop that can only be written using \(for\), never \(while\)
- **B)** A loop that always executes exactly once
- **C)** A loop whose condition never becomes \(false\), often caused by forgetting to update the loop control variable inside the loop body (e.g., forgetting \(i++\))
- **D)** A loop that causes a compile-time error

Answer & Explanation:

**Answer: C)**

Forgetting to update the variable that the loop condition depends on is one of the most common causes of accidentally writing an infinite loop.

Question #4 Active Recall

What is the general syntax of a Java \(for\) loop, and what are its three components?

- **A)** \(for\ (update;\ condition;\ initialization)\)
- **B)** \(for\ (condition;\ initialization;\ update)\)
- **C)** \(for\ \{\ initialization;\ condition;\ update;\ \}\)
- **D)** \(for\ (initialization;\ condition;\ update)\ \{\ statements;\ \}\) -- the initialization runs once before the loop starts, the condition is checked before each iteration, and the update runs after each iteration

Answer & Explanation:

**Answer: D)**

The three \(for\)-loop components run in this specific order (and specific timing) every iteration: init once, then repeatedly check-condition, run-body, run-update.

Question #5 Active Recall

How many times does the loop body execute in \(for\ (int\ i\ =\ 0;\ i\

Answer & Explanation:

**Answer: D)**

This loop runs for \(i\) = 0 through 9 (10 total values), since the condition \(i < 10\) becomes false once \(i\) reaches 10.

Question #6 Active Recall

How many times does the loop body execute in \(for\ (int\ i\ =\ 1;\ i\

Answer & Explanation:

**Answer: B)**

Starting at 1 and continuing while \(i \leq 10\) gives exactly 10 iterations: 1 through 10 inclusive.

Question #7 Active Recall

What is the key difference in WHEN the condition is checked between a \(while\) loop and a \(do\)-\(while\) loop?

- **A)** A \(while\) loop always runs at least once, just like \(do\)-\(while\) (the reverse of the truth)
- **B)** A \(do\)-\(while\) loop never actually checks its condition
- **C)** A \(while\) loop checks its condition BEFORE the first iteration (so the body may run zero times), while a \(do\)-\(while\) loop checks its condition AFTER each iteration (so the body always runs AT LEAST once)
- **D)** Both loop types always check their condition before the first iteration

Answer & Explanation:

**Answer: C)**

This before-vs-after condition-check timing is the single most important distinction between \(while\) and \(do\)-\(while\) loops.

Question #8 Active Recall

Given \(int\ x = 10;\ do\ \{\ System.out.println(x);\ x++;\ \}\ while\ (x\

Answer & Explanation:

**Answer: A)**

This demonstrates the defining feature of \(do\)-\(while\): the body executes once BEFORE the condition is ever checked, regardless of whether the condition would have been true.

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