Program structure in Rust - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the entry point of a Rust program?

The entry point of a Rust program is the main function. It is where the program starts running.

beginner

How do you define a function in Rust?

You define a function in Rust using the fn keyword, followed by the function name and parentheses. For example: fn greet() {}

intermediate

What is the purpose of the use keyword in Rust?

The use keyword brings modules, functions, or types into scope so you can use them without writing the full path every time.

intermediate

What is a module in Rust and why is it useful?

A module is a way to organize code into separate namespaces. It helps keep code clean and manageable by grouping related functions, structs, and other items.

beginner

How do you write comments in Rust?

Single-line comments start with //. Multi-line comments are enclosed between /* and */. Comments help explain code to others or yourself.

What keyword starts the main function in a Rust program?

A function

B main

C start

D fn

The fn keyword is used to define any function, including main.

Which symbol is used to write a single-line comment in Rust?

A //

B #

C /*

D <!--

Single-line comments in Rust start with //.

What does the use keyword do in Rust?

A Defines a new function

B Imports code into scope

C Starts the program

D Declares a variable

The use keyword brings modules or items into scope for easier access.

Which of these is a correct way to define a function named hello in Rust?

A fn hello() {}

B function hello() {}

C def hello() {}

D func hello() {}

Rust uses fn to define functions.

Why are modules useful in Rust?

A To speed up the program

B To declare variables

C To organize code into namespaces

D To write comments

Modules help organize code by grouping related items into namespaces.

Explain the basic structure of a Rust program including the main function and modules.

Think about where the program starts and how code is grouped.

Describe how comments are written in Rust and why they are important.

Comments help others understand your code.