Rust Programming Basics Quiz

1. What is the official name of the Rust compiler?

RustC CargoC Rustling Rusty Compiler

2. Which command is used to create a new Rust project with Cargo?

`rust new project` `cargo init project` `cargo new project` `create new project`

3. What is the default entry point function for a Rust executable program?

`start()` `main()` `run()` `entry()`

4. How do you print a line to the console in Rust?

`console.log("Hello");` `print_line("Hello");` `println!("Hello");` `echo "Hello";`

5. What is `Cargo` in the Rust ecosystem?

The Rust debugger The Rust package manager and build system The Rust standard library The Rust official IDE

6. Which keyword is used to declare an immutable variable in Rust?

`var` `let` `const` `imm`

7. How do you make a variable mutable in Rust?

By using the `mutable` keyword By using the `mut` keyword Variables are mutable by default By using the `var` keyword

8. What is a "slice" in Rust?

A fixed-size array A reference to a contiguous sequence of elements in a collection A dynamically sized vector A type of string literal

9. Which of these is NOT a primitive integer type in Rust?

`i32` `u64` `int` `isize`

10. What is a "tuple" in Rust?

A collection of elements of the same type A fixed-size grouping of values of different types A dynamic array A structured data type with named fields

11. How do you declare a function in Rust?

`function my_func() {}` `def my_func():` `fn my_func() {}` `func my_func() {}`

12. What does `->` signify in a function signature?

It indicates the function takes no arguments It indicates the function returns a value of the specified type It indicates a reference parameter It's used for type casting

13. Which concept is central to Rust's memory safety guarantees without a garbage collector?

Pointers Smart pointers Ownership and borrowing Reference counting

14. What is the purpose of `if let` expressions in Rust?

To declare a variable and assign it a value To conditionally assign a value to a mutable variable To combine `if` and `match` into a less verbose way to handle a single match arm To create a new scope for a variable

15. How do you create an array in Rust?

`let arr = [1, 2, 3];` `let arr: array = [1, 2, 3];` `let arr = new Array(1, 2, 3);` `let arr = vec![1, 2, 3];`

16. What does the `&` symbol usually denote in Rust?

A mutable variable An integer literal A reference (borrow) An arithmetic operator

17. What is the type of a string literal, e.g., `"Hello, world!"`?

`String` `str` `&String` `&str`

18. How do you convert a `&str` to a `String`?

Using `to_string()` method Using `String::from()` function Both a and b It's not possible to convert them

19. What is a "struct" in Rust?

A collection type like a vector A custom data type that lets you name and package together multiple related values A function that returns a structure A pointer to a data block

20. Which of these is the correct way to define an `enum`?

`enum Direction { North, East, South, West };` `enum Direction { North, East, South, West }` `enum Direction = [North, East, South, West];` `Enum Direction { North, East, South, West };`

21. What is the primary purpose of the `match` control flow operator?

For simple true/false conditions To iterate over collections To compare a value against a series of patterns and execute code based on which pattern matches To handle potential errors

22. What is an "Option" enum in Rust?

Used for asynchronous operations Represents the possibility of something being either `Some` value or `None` A way to define optional function arguments A type for command-line arguments

23. How do you loop indefinitely in Rust?

`while true {}` `loop {}` `for ;; {}` `infinite {}`

24. What does the `.` operator do when accessing fields of a struct?

It de-references a pointer It indicates a method call It allows direct access to named fields of a struct or enum variant It's used for range iteration

25. Which command compiles and runs a Rust project using Cargo?

`cargo build && cargo exec` `cargo run` `rustc main.rs && ./main` `cargo start`