- Study guides, Class notes & Summaries

composition - ANSWER a relationship between two classes where instances of one class contain references to instances of the other a 'has a' relationship representation invariants - ANSWER a property of the instance attribute that every instance of a class must satisfy - it is a post condition and a pre condition - initializer is responsible for initializing attributes such that the representation invariant isn't met

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7 pages

Written in 2023/2024

Grade A+

QUINTER

An object has - ANSWER Unique ID, type, value A variable always stores a reference to an? - ANSWER object Does a variable have a type? - ANSWER No Equality of values vs equality of addresses - ANSWER (values: ==) (addresses: is)_ frame and call stack - ANSWER frame: data about a function call (including local variables) call stack: a collection of the frames of the function that are currently running. Function Call - ANSWER 1. A new frame is placed on top of the call stack. 2. Each parame...

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7 pages

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CRPC Questions with Detailed Verified Answers

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4 pages

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the only mutable types - ANSWER list and dictionaries and user defined classes Where is all data stored in? - ANSWER objects that have 3 components -> id, type and value What is special about id - ANSWER The id of an object is a unique identifier, meaning that no other object has the same identifier. difference between object and variable? - ANSWER a variable stores an object with value, id and type Variables are not objects because it doesn't store data but only storing the id. it REF...

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21 pages

Written in 2023/2024

Grade A+

QUINTER

Immutable Types - ANSWER Strings, integers, boolean, tuples value stored in an object cant change Mutable Types - ANSWER Lists, dictionaries, user defined classes ID are changable Aliasing - ANSWER A circumstance where two or more variables refer to the same object. If you change one, the other will be changed

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3 pages

Written in 2023/2024

Grade A+

QUINTER

objects are composed of... - ANSWER id (unique identifier) type (determines what functions it can use) value (what it "points to") variables - ANSWER -have an id → point to an object that stores data - variables are NOT objects immutable objects - ANSWER -immutable objects value cannot be changed however you can change what object the variable points to mutable objects - ANSWER -id does not change when value is changed -two objects may have same value but diff id -aliased variables ...

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12 pages

Written in 2023/2024

Grade A+

QUINTER