AP Computer Science Principles · Unit 2 · Encoding Information
Data & Representation: every key term you need (+ practice quiz)
20 flashcard terms for AP Computer Science Principles Unit 2, written to match the course framework. Study them here, then drill them as interactive flashcards, or test yourself with the 5-question quiz — free, no account needed.
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Algorithm Step-by-step procedure for solving a problem; can be represented in pseudocode or flowcharts.
Pseudocode Simplified code-like language describing algorithms without specific programming syntax.
Sequence Algorithm structure where steps execute in order from top to bottom.
Selection Algorithm structure using conditionals (if/else) to choose different paths based on conditions.
Iteration Algorithm structure using loops to repeat steps multiple times (for, while).
Conditional Decision statement (if/else) that executes code based on whether condition is true or false.
Loop Repetition structure that executes code multiple times; types include for loops and while loops.
Variable Named container storing a data value that can change during program execution.
Data Type Classification of data: integer, string, boolean, floating-point, etc.
String Sequence of characters (letters, numbers, symbols) treated as text data.
List/Array Ordered collection of elements accessible by index; stores multiple values in one variable.
Function Reusable block of code performing a specific task; takes input (parameters) and may return output.
Parameter Input variable in a function definition; specifies what data the function accepts.
Return Value Output value that a function sends back to the calling code.
Scope Region of code where a variable is accessible; local scope (within function) vs. global scope.
Debugging Process of finding and fixing errors (bugs) in code.
Logic Error Code runs without crashing but produces incorrect results due to flawed algorithm.
Syntax Error Mistake in code structure preventing the program from running.
Flowchart Visual diagram using symbols to represent algorithm steps and decision points.
Abstraction Process of hiding complex details and showing only essential features.
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