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

Curriculum Overview

Comprehensive, high-yield AP Computer Science A study deck focusing on Primitive Types. Features 50 rigorous, curriculum-aligned flashcards designed for beginner-level mastery. Core concepts covered include Computer Science, 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

Java They This FIRST Java's String Integer Science Computer Evaluate

Sample Flashcard Questions & Answers

Showing 8 of 50 cards

Question #1 Active Recall

Which of the following are the THREE primitive data types most commonly used in AP Computer Science A?

- **A)** \(class\), \(void\), and \(public\)
- **B)** \(String\), \(int\), and \(ArrayList\)
- **C)** \(int\), \(double\), and \(boolean\)
- **D)** \(Integer\), \(Double\), and \(Boolean\) (capitalized)

Answer & Explanation:

**Answer: C)**

\(int\) (whole numbers), \(double\) (decimal numbers), and \(boolean\) (true/false) are the core primitive types tested on the AP exam; note \(String\) is actually a class (reference type), not a primitive.

Question #2 Active Recall

What is the key difference between a PRIMITIVE type (like \(int\)) and a REFERENCE type (like \(String\)) in Java?

- **A)** A primitive variable directly stores its actual value, while a reference type variable stores the MEMORY ADDRESS (reference) of an object, not the object's data itself
- **B)** Primitive types and reference types are stored identically in memory with no distinction
- **C)** Primitive types always require the \(new\) keyword to create
- **D)** Reference types can never be used in Java programs

Answer & Explanation:

**Answer: A)**

This distinction is foundational to understanding Java's memory model: primitives hold values directly, while reference types hold a pointer to an object elsewhere in memory.

Question #3 Active Recall

Which of the following is a valid variable declaration and initialization in Java?

- **A)** \(5\ int\ x;\)
- **B)** \(int\ x = 5;\)
- **C)** \(int\ 5 = x;\)
- **D)** \(x\ int = 5;\)

Answer & Explanation:

**Answer: B)**

Java syntax requires the type first, then the variable name, then an optional assignment: \(type\ name = value;\).

Question #4 Active Recall

What value is stored in \(x\) after executing \(int\ x = 7 / 2;\)?

- **A)** \(3\)
- **B)** \(3.5\)
- **C)** \(3.0\)
- **D)** \(4\)

Answer & Explanation:

**Answer: A)**

Integer division in Java truncates (discards) the decimal portion of the result, so \(7/2\) evaluates to \(3\), not \(3.5\).

Question #5 Active Recall

What value is stored in \(x\) after executing \(double\ x = 7 / 2;\)?

- **A)** This code does not compile
- **B)** \(4.0\)
- **C)** \(3.0\), since both operands (7 and 2) are still \(int\) literals, so integer division occurs FIRST (giving 3), and only THEN is the int result 3 widened to the double 3.0 for assignment
- **D)** \(3.5\), since \(x\) is declared as \(double\)

Answer & Explanation:

**Answer: C)**

A very commonly tested trap: declaring the VARIABLE as \(double\) does NOT change how the expression \(7/2\) itself is evaluated -- since both literals are \(int\), integer division happens first.

Question #6 Active Recall

What value is stored in \(x\) after executing \(double\ x = 7.0 / 2;\)?

- **A)** \(3.0\)
- **B)** \(3.5\)
- **C)** \(3\)
- **D)** \(4.0\)

Answer & Explanation:

**Answer: B)**

Since one operand (7.0) is already a \(double\), the entire expression is evaluated using floating-point (real) division, giving the expected \(3.5\).

Question #7 Active Recall

What does the MODULUS operator \(\%\) compute in Java?

- **A)** The absolute value of the difference between two numbers
- **B)** The result of dividing the two operands as decimals
- **C)** The percentage of one number relative to another
- **D)** The remainder after integer division of the left operand by the right operand

Answer & Explanation:

**Answer: D)**

The modulus operator returns whatever is 'left over' after dividing as far as possible using whole numbers -- extremely useful for checking even/odd, wraparound, and similar patterns.

Question #8 Active Recall

Evaluate \(17 \% 5\) in Java.

- **A)** \(3.4\)
- **B)** \(12\)
- **C)** \(3\)
- **D)** \(2\)

Answer & Explanation:

**Answer: D)**

\(17 = 3 \times 5 + 2\), so the remainder (and thus \(17\%5\)) is \(2\).

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