Writing first Rust program - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to print "Hello, world!" in Rust.

Rust

fn main() {
    println!([1]);
}

Drag options to blanks, or click blank then click option'

AHello, world!

B"Hello, world!"

Cprintln!("Hello, world!")

Dprint!("Hello, world!")

Attempts:

3 left

💡 Hint

Common Mistakes

Forgetting the quotes around the text.

Using print! instead of println! for a new line.

The println! macro prints text to the screen. The text must be inside double quotes.

2fill in blank

medium

Complete the code to declare the main function in Rust.

Rust

fn [1]() {
    println!("Hello from Rust!");
}

Drag options to blanks, or click blank then click option'

Amain

Bbegin

Cstart

Drun

Attempts:

3 left

💡 Hint

Common Mistakes

Using a different function name instead of main.

Forgetting the parentheses after the function name.

The entry point of a Rust program is the main function.

3fill in blank

hard

Fix the error in the code to correctly print a message.

Rust

fn main() {
    println!([1]);
}

Drag options to blanks, or click blank then click option'

Aprint!("Hello, Rust!")

BHello, Rust!

Cprintln!("Hello, Rust!")

D"Hello, Rust!"

Attempts:

3 left

💡 Hint

Common Mistakes

Leaving out the quotes causes a compile error.

Using print! instead of println! changes output formatting.

The argument to println! must be a string literal enclosed in double quotes.

4fill in blank

hard

Fill both blanks to create a function that prints a greeting.

Rust

fn [1]() {
    println!([2]);
}

Drag options to blanks, or click blank then click option'

Agreet

B"Welcome to Rust!"

C"Hello, friend!"

Dmain

Attempts:

3 left

💡 Hint

Common Mistakes

Using a message without quotes.

Using main as function name when a different name is asked.

The function name can be greet, and the message must be a string literal like "Hello, friend!".

5fill in blank

hard

Fill all three blanks to print a custom message inside the main function.

Rust

fn [1]() {
    let message = [2];
    println!([3]);
}

Drag options to blanks, or click blank then click option'

Amain

B"Rust is fun!"

Cmessage

D"Hello from Rust!"

Attempts:

3 left

💡 Hint

Common Mistakes

Printing the string literal directly instead of the variable.

Using wrong function name or missing quotes around the string.

The main function is named main. The variable message holds the string "Rust is fun!". The println! macro prints the variable message.