Using external crates in Rust - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to add the external crate rand in the Cargo.toml file.

Rust

[dependencies]
rand = "[1]"

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Arandom

B1.0

C0.8

Dlatest

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'latest' or 'random' as version strings which are invalid.

Omitting the version number.

The rand crate version 0.8 is a valid and commonly used version. You specify the version number as a string in Cargo.toml.

2fill in blank

medium

Complete the code to import the thread_rng function from the rand crate.

Rust

use rand::[1];

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ARng

BSeedableRng

Crandom

Dthread_rng

Attempts:

3 left

💡 Hint

Common Mistakes

Importing traits like Rng instead of the function.

Using random which is a different function.

The thread_rng function provides a random number generator local to the current thread.

3fill in blank

hard

Fix the error in the code to generate a random number between 1 and 10.

Rust

let mut rng = thread_rng();
let num = rng.gen_range([1]);

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A1..10

B1..=10

C0..10

D1, 10

Attempts:

3 left

💡 Hint

Common Mistakes

Using 1..10 which excludes 10.

Passing two numbers separated by a comma which is invalid.

The range 1..=10 includes both 1 and 10, generating numbers from 1 to 10 inclusive.

4fill in blank

hard

Fill both blanks to import the thread_rng function and the Rng trait from the rand crate.

Rust

use rand::[1];
use rand::[2];

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Athread_rng

BRng

Crandom

DSeedableRng

Attempts:

3 left

💡 Hint

Common Mistakes

Importing only the function or only the trait.

Importing unrelated items like random or SeedableRng.

You import thread_rng function to get the random number generator and Rng trait to use methods like gen_range.

5fill in blank

hard

Fill all three blanks to create a random number generator, generate a number between 5 and 15, and print it.

Rust

use rand::[1];
use rand::[2];

fn main() {
    let mut rng = [3]();
    let num = rng.gen_range(5..=15);
    println!("Random number: {}", num);
}

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Athread_rng

BRng

Drandom

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing the function name with the trait name.

Not calling the function to create the generator.

You import thread_rng function and Rng trait, then call thread_rng() to get the generator.