C/Rust Programming Languages Review

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Questions and Answers

The final exam allows students to use their notes.

False (B)

What is one algorithm implemented in Rust as mentioned?

Rivest-Shamir-Adleman (RSA) algorithm

The for loop is a type of ______ that runs for a specific amount of time.

conditional loop

Match the programming constructs with how they were used:

<p>Arrays = Used in C Vectors = Used in Rust Pointers = Common to both C and Rust Crates = Specific to Rust</p> Signup and view all the answers

The exam consists of 25 questions worth between 0.5 and 1 point each.

<p>True (A)</p> Signup and view all the answers

What tool is mentioned for creating programs?

<p>Visual Studio Code (VS Code)</p> Signup and view all the answers

What is one of the main benefits of using functions in programming?

<p>Reusability (B)</p> Signup and view all the answers

Functions must always be defined before they can be called in Rust.

<p>False (B)</p> Signup and view all the answers

What keyword is used to define functions in Rust?

<p>fn</p> Signup and view all the answers

A single function can be used in __________ different programs.

<p>several</p> Signup and view all the answers

Match the following terms with their definitions:

<p>Function Definition = Describes the body of the function Abstraction = Using a function without knowing its implementation Parameter List = Values passed to a function when called Function Declaration = Tells the compiler about a function's return type</p> Signup and view all the answers

Which of the following statements about function definitions is true?

<p>Function definitions include the code that should run. (D)</p> Signup and view all the answers

In Rust, an empty parameter list means a function does not require any arguments.

<p>True (A)</p> Signup and view all the answers

What is the syntax to call a function named 'say_hello' in Rust?

<p>say_hello();</p> Signup and view all the answers

What type is used for string literals in Rust?

<p>&amp;str (B)</p> Signup and view all the answers

String literals in Rust are mutable and can be changed at runtime.

<p>False (B)</p> Signup and view all the answers

What is the main difference between a string literal and a String object in Rust?

<p>String literals are immutable and stored on the stack, while String objects are mutable and stored on the heap.</p> Signup and view all the answers

The String object type in Rust is defined in the ___________ Library.

<p>Standard</p> Signup and view all the answers

Match the following functions to their purpose in creating String objects:

<p>String::new() = Generates an empty string String::from() = Creates a string from a given value String mutable = Allows modifications to the string String UTF-8 = Defines character encoding for the string</p> Signup and view all the answers

Which of the following is an example of a String literal in Rust?

<p>let company: &amp;str = 'Amazon' (B)</p> Signup and view all the answers

String literals have an undefined lifetime in a program.

<p>False (B)</p> Signup and view all the answers

What is the purpose of the heap when using the String object in Rust?

<p>The heap is used to allocate memory for String objects, allowing them to expand and change at runtime.</p> Signup and view all the answers

What is the main characteristic of memory on the stack in Rust?

<p>It is fast and local to a function call. (C)</p> Signup and view all the answers

The heap is faster than the stack for memory allocation.

<p>False (B)</p> Signup and view all the answers

What data type in Rust allows you to store values on the heap?

<p>Box</p> Signup and view all the answers

The stack is limited in size and __________ accessible.

<p>locally</p> Signup and view all the answers

Match the following characteristics with either the Stack or the Heap:

<p>Fast and local to function calls = Stack Explicitly allocated memory = Heap Limited in size = Stack Effectively unlimited in size = Heap</p> Signup and view all the answers

Which of the following statements about heap memory in Rust is true?

<p>It is slower than stack memory but allows for longer-lasting data. (D)</p> Signup and view all the answers

Rust uses garbage collection to manage memory.

<p>False (B)</p> Signup and view all the answers

Name one downside of using the stack for memory allocation.

<p>Cannot keep values beyond the function's execution.</p> Signup and view all the answers

What does the area method in the Rectangles struct return?

<p>The area of the rectangle (D)</p> Signup and view all the answers

The impl block is used to define functions that are associated with a specific struct.

<p>True (A)</p> Signup and view all the answers

What parameter does the area method take to reference the instance of the struct?

<p>self</p> Signup and view all the answers

In Rust, an enumeration of IP address types would be defined using the keyword ______.

<p>enum</p> Signup and view all the answers

Match the following IP address types with their versions:

<p>V4 = Version 4 IP address V6 = Version 6 IP address</p> Signup and view all the answers

Which statement about enums is true?

<p>Enums represent a fixed set of possible values. (B)</p> Signup and view all the answers

The Rectangles struct can have multiple methods defined under different impl blocks.

<p>True (A)</p> Signup and view all the answers

What is the output of the following code: println!(“Area of the rectangle {} square pixels.”, rect1.area()); ?

<p>2400</p> Signup and view all the answers

What does the function calculate_length return?

<p>A tuple containing the string and its length (B)</p> Signup and view all the answers

Borrowing in Rust allows passing a value to a function without transferring ownership.

<p>True (A)</p> Signup and view all the answers

What unary operator is used to indicate a borrowed reference in Rust?

<p>&amp;</p> Signup and view all the answers

In Rust, when you pass a reference to a function, the type is denoted as _____ instead of the original type.

<p>&amp;Type</p> Signup and view all the answers

What happens to the value of fruit after the call to print_fruit(fruit)?

<p>The value of fruit is moved into print_fruit (D)</p> Signup and view all the answers

When you borrow a value of type Fruit, you obtain a Fruit back.

<p>False (B)</p> Signup and view all the answers

What function is used in the code to calculate the length of a string?

<p>len()</p> Signup and view all the answers

Flashcards

For Loop

A loop that executes for a specific number of iterations/steps.

C Programming

A programming language where you use functions to perform tasks.

Rust Programming

A system programming language offering memory safety without garbage collection.

Function definition

A function definition describes the body of a function, including the code that it should execute.

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Reusability (functions)

Using a function multiple times in a program (without rewriting the code).

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Function call

Invoking a function by its name followed by parentheses containing arguments.

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Function declaration (C)

Tells the compiler the function's return type and parameters.

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Function order (Rust)

Functions can be called in any order; compilation finds all functions first.

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Function parameter (argument)

Data passed to a function to use.

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Function

A block of code that performs a specific task.

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Abstraction (functions)

Hiding the internal workings of a function from the user, focusing on the result.

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String Literal

A fixed, immutable string value that is defined at compile time and stored on the stack. They are declared using the &str type.

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String Object

A flexible, mutable string value that can be changed at runtime and is stored on the heap. They are declared using the String type.

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String Object Creation

String objects can be created using methods like String::new() to initialize an empty string or String::from() to create a string with a default value.

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String Slice

A reference to a portion of a string, allowing access to a substring without copying the entire string.

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String Object (String)

A heap-allocated, mutable string data structure, allowing dynamic resizing and modification.

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String Literal (&str)

A static, immutable string slice that exists for the entire program execution and is stored on the stack.

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UTF-8 Encoding

The standard encoding used by Rust's String objects to represent characters from different languages.

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Heap Allocation

The process of allocating memory for mutable data structures like String objects during program execution.

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Stack Memory

Memory allocated in Rust by default, used for local variables within function calls. Fast but limited in size.

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Heap Memory

Memory explicitly allocated by the program. Slower than the stack, but it's globally accessible and effectively unlimited in size.

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Why use the heap?

To store data that needs to be accessed across different functions or persist longer than a single function's execution.

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What is a Box?

A data type in Rust that allows you to store a value on the heap.

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Ownership in Rust

A mechanism that ensures each piece of data in Rust has a single owner, managing memory safety and preventing data corruption.

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Move (ownership)

Transferring ownership of data from one variable to another.

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Clone (ownership)

Creating a copy of data, allowing multiple variables to own the same data.

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Copy (ownership)

Creating a copy of simple data types (like integers or booleans) without transferring ownership.

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& (Reference)

The & symbol in Rust indicates a reference to a value. It allows functions to borrow data without moving ownership, enabling efficient code and reducing memory consumption.

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Borrowed References

A reference to a value in Rust. Borrowing allows functions to use a value without transferring ownership, ensuring the data remains accessible in the original scope.

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Why Use Borrowed References?

References are essential in Rust for avoiding unnecessary copying, enhancing performance, and maintaining data integrity. They allow functions to access and modify data without duplicating it.

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Function Argument Type

In Rust, the type of an argument passed to a function determines how it will be used. A borrowed reference (&T) allows the data to be reused, while moving ownership (T) transfers the data to the called function.

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Tuple Return

Functions can return multiple values using tuples in Rust. This allows returning relevant information related to the function's purpose.

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Calculate Length Function

The calculate_length function demonstrates the use of a tuple to return both the original string and its calculated length.

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String Object vs String Literal

In Rust, String literals (&str) are immutable and stored on the stack, while String objects are mutable, heap-allocated, and allow dynamic resizing.

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Method Syntax

A way to call a function on an instance of a struct. It involves using a dot (.) followed by the function name, parentheses, and any necessary parameters.

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Self in Methods

A special parameter within a function defined within an 'impl' block for a struct. It represents the specific instance of the struct that called the function.

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Impl Block

A block of code that defines methods and associated functions for a struct. It begins with the 'impl' keyword and specifies the struct type it applies to.

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Enum (Enumeration)

A data type that represents a fixed set of possible values. These values are named and can be used to represent various types within a single enumeration.

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IP Address Types

IP addresses are either IPv4 or IPv6, with distinct formats and structures. They're represented by enums like 'IpAddrKind' to ensure type safety.

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Type Safety with Enums

Enums enforce type safety by ensuring that only valid values from the defined set can be assigned. This prevents errors related to incompatible data types.

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Enum Advantages over Structs

Enums are more suitable than structs when representing a set of fixed, distinct values. They directly represent the possible states of a concept, improving clarity and maintainability.

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Reason for Using Enums

Enums improve code readability and maintainability by clearly representing different possibilities within a single type. They ensure type safety and make the code less prone to errors.

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Study Notes

C/Rust Programming Languages Review

  • The presentation is a review for a final exam on C/Rust programming.
  • The review covers topics like Visual Studio Code, Git, C programming, Rust programming, data structures, algorithms (Hamming code encoder/decoder, RSA), and programming concepts like functions, iterators, and their use in scenarios like looping over a list and using array examples with the iter() function.
  • The material discusses the structure of functions, parameter passing (pass by value and pass by reference), return values and scope in C/Rust programming.
  • The presentation also includes material explaining the difference between Stack memory and Heap memory in detail.
  • The various ways of handling, building and working with Strings in Rust are explored: string literals, the string object, building strings (using new() and from() syntax) along with common string methods.
  • The review discusses important concepts about Rust’s ownership system emphasizing the move, clone, and copy mechanisms, along with rules of ownership.
  • The presentation includes explanations of Variable Scope, and how variables and data interact, including examples of moving values between variables.
  • The use and importance of Structs is explored, along with how to create structs.
  • The material also details slices in Rust, exploring their creation and usage with functions.
  • Explanation of methods and enums, along with examples for each.
  • Presentation details the various types of pointers (references, Box, unsafe pointers).
  • Detailed information on what happens when we use RefCell to change values without declaring mutable variable,
  • Discussion of a panic in the context of a Rust program
  • Discussion of reference safety in Rust for preventing dangling pointers by checking lifetimes

Additional Topics

  • Instruction for the student quiz #4/ Final Exam
    • The final exam is closed book; no notes are allowed.
    • The exam will take place on Monday, December 9th, at 7:30 AM.
    • The exam will last 75 minutes.
    • Students need to bring their laptops.
    • The test is worth 20 points.
    • There are 25 questions, each worth between 0.5 and 1 point.
    • Students are expected to follow academic integrity rules, and not be involved in any form of cheating.
  • Student Assessment
  • 75% = 1 extra credit point
  • 90% = 2 extra credit points
  • 2% of 79 = 2 extra credit points available. 57 more students need to respond to reach the 75% mark.
  • The email will be from [email protected].

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