Program structure in Rust - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define the main function in Rust.

Rust

fn [1]() {
    println!("Hello, world!");
}

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

Arun

Bstart

Cmain

Dbegin

Attempts:

3 left

💡 Hint

Common Mistakes

Using a different function name instead of main.

Adding parameters to the main function.

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

2fill in blank

medium

Complete the code to print a message inside the main function.

Rust

fn main() {
    [1]!("Welcome to Rust!");
}

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

Aprint

Bprintln

Cecho

Dwrite

Attempts:

3 left

💡 Hint

Common Mistakes

Using print which does not add a newline.

Trying to use functions instead of macros.

The println! macro prints text with a newline at the end.

3fill in blank

hard

Fix the error in the function declaration to make it valid Rust code.

Rust

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

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

A()

B{}

C<()>

D[]

Attempts:

3 left

💡 Hint

Common Mistakes

Omitting parentheses after the function name.

Using braces {} instead of parentheses.

Functions in Rust require parentheses () after the name, even if no parameters.

4fill in blank

hard

Fill both blanks to create a valid Rust program that prints a message.

Rust

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

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

Amain

Bprint

Cprintln

Dstart

Attempts:

3 left

💡 Hint

Common Mistakes

Using incorrect function names.

Using print instead of println.

The program needs the main function and the println! macro to print the message.

5fill in blank

hard

Fill all three blanks to define a main function that prints a formatted message.

Rust

fn [1]() {
    [2]!("Number: {}", [3]);
}

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

Amain

Bprintln

C42

Dprint

Attempts:

3 left

💡 Hint

Common Mistakes

Using print instead of println.

Not providing a value for the placeholder.

The main function uses println! macro to print the number 42 formatted inside the string.