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  1. AP Computer Science A
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Boolean Expressions and if Statements

Sophie Anderson

Sophie Anderson

7 min read

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Study Guide Overview

This study guide covers Unit 3 of AP Computer Science A, focusing on Conditional Logic. It explores boolean expressions, if-else statements (including nested conditionals and if-else if-else structures), boolean logic operators (!, &&, ||), and comparing objects (== vs. .equals()). The guide emphasizes these concepts' importance for the AP exam, including their weighting and common question types. Practice questions and exam tips are also provided.

#AP Computer Science A: Unit 3 - Mastering Conditional Logic

Hey future AP Computer Science rockstar! 🌟 Ready to nail Unit 3? This guide is your ultimate cheat sheet for acing those tricky boolean expressions and conditional statements. Let's break it down, make it stick, and get you feeling confident for the exam!


#Unit 3: Conditional Statements - The Power of Choice

This unit is a big deal, making up 15-17.5% of your AP exam score! That means mastering this material can significantly boost your grade. Expect to see around 6-7 multiple-choice questions and a good chunk of FRQ #1 focusing on control structures, including those crucial if-else if-else statements.


#The Big Idea: Logic and Decision Making

At its core, this unit is all about teaching your code to make decisions. We're moving beyond simple line-by-line execution (sequencing) and diving into branching, where your program takes different paths based on conditions. Think of it like a choose-your-own-adventure book, but with code! 🚀


#Key Concepts at a Glance

  • Boolean Expressions: These are the true/false questions your code asks. They're the foundation of all decision-making in your programs.
  • If-Else Statements: These are the tools you use to create branching paths in your code. They allow different actions based on whether a condition is true or false.
  • Comparing Objects: Comparing objects isn't as simple as comparing numbers. You need to know the difference between == and .equals().

#Diving Deep into Unit 3

#1. Boolean Expressions: The Foundation of Logic

Boolean expressions are the heart of conditional logic. They evaluate to either true or false, and they're built using comparison operators:

  • == : Checks if two primitive values are equal. (e.g., 5 == 5 is true)
  • != : Checks if two values are not equal. (e.g., 5 != 6 is true)
  • < : Less than. (e.g., 5 < 6 is true)
  • <= : Less than or equal to. (e.g., 5 <= 5 is true)
  • > : Greater than. (e.g., 6 > 5 is true)
  • >= : Greater than or equal to. (e.g., 6 >= 6 is true)

#2. Conditional Statements: Making Decisions

Conditional statements are how you use boolean expressions to control the flow of your program. They come in three main forms:

  • **if stateme...
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Question 1 of 13

What does the boolean expression 7 < 10 evaluate to? 🤔

true

false

null

Error