Constants in Rust - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare a constant named MAX_SCORE with value 100.

Rust

const MAX_SCORE: i32 = [1];

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

A100

B"100"

Cmax_score

Dconst

Attempts:

3 left

💡 Hint

Common Mistakes

Using quotes around numbers makes it a string, not a number.

Trying to use a variable name instead of a value.

Constants in Rust are declared with const and must have a value assigned. Here, 100 is the correct value.

2fill in blank

medium

Complete the code to declare a constant PI with type f64 and value 3.14.

Rust

const PI: [1] = 3.14;

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

Ai32

Bf64

Cbool

DString

Attempts:

3 left

💡 Hint

Common Mistakes

Using integer type i32 for a decimal number.

Using string or boolean types incorrectly.

The constant PI is a floating-point number, so its type should be f64.

3fill in blank

hard

Fix the error in the constant declaration by completing the code.

Rust

const GREETING: &str = [1];

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

A"Hello"

BHello;

CHello

D'Hello'

Attempts:

3 left

💡 Hint

Common Mistakes

Forgetting quotes around string literals.

Using single quotes which are for chars, not strings.

String literals in Rust must be enclosed in double quotes. So "Hello" is correct.

4fill in blank

hard

Fill both blanks to declare a constant named SPEED_LIMIT of type u32 with value 60.

Rust

const SPEED_LIMIT: [1] = [2];

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

Au32

Bi32

C60

D"60"

Attempts:

3 left

💡 Hint

Common Mistakes

Using signed integer type i32 when unsigned is better here.

Putting the number in quotes, making it a string.

The constant SPEED_LIMIT should have type u32 (unsigned 32-bit integer) and value 60 without quotes.

5fill in blank

hard

Fill all three blanks to declare a constant named AUTHOR with type &str and value "Alice".

Rust

const [1]: [2] = [3];

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

AAUTHOR

B&str

C"Alice"

Dauthor

Attempts:

3 left

💡 Hint

Common Mistakes

Using lowercase for constant names.

Using incorrect type for string constants.

Forgetting quotes around string values.

The constant name is AUTHOR, its type is &str for string slice, and the value is the string literal "Alice".