If–else expression in Rust - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to assign 10 to x if condition is true, otherwise 5.

Rust

let x = if condition [1] 10 else 5;

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

A==

B{

C;

Dtrue

Attempts:

3 left

💡 Hint

Common Mistakes

Using a semicolon instead of braces after if condition.

Trying to use == instead of braces for the if block.

The if–else expression in Rust uses braces {} to enclose the blocks of code for each condition.

2fill in blank

medium

Complete the code to assign the larger of a and b to max using if–else expression.

Rust

let max = if a > b [1] a else b;

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

A;

B:

Cthen

D{

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'then' keyword which Rust does not have.

Omitting braces around the values.

In Rust, the if and else blocks must be enclosed in braces to form an expression.

3fill in blank

hard

Fix the error in the if–else expression to correctly assign a value to result.

Rust

let result = if number % 2 == 0 [1] "even" else "odd";

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

A{

B;

C:

Dthen

Attempts:

3 left

💡 Hint

Common Mistakes

Using semicolon instead of braces.

Using 'then' keyword which Rust does not support.

Rust requires braces around the blocks in if–else expressions, even for single expressions.

4fill in blank

hard

Complete the code to create a conditional expression that assigns 'positive' or 'non-positive' to status.

Rust

let status = if number {BLANK_1}} 0 { "positive" else "non-positive";

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

A>

B{

D<=

Attempts:

3 left

💡 Hint

Common Mistakes

Using less than or equal operator in the condition.

Omitting braces after the if condition.

The condition uses > to check if number is greater than zero, and braces to group the true block.

5fill in blank

hard

Fill all three blanks to assign a grade based on score using nested if–else expressions.

Rust

let grade = if score >= 90 [1] "A" else if score >= 80 [2] "B" else [3] "C";

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

A{

D;

Attempts:

3 left

💡 Hint

Common Mistakes

Omitting braces around nested if blocks.

Using semicolons instead of braces.

Each if and else if block must be enclosed in braces to form valid Rust expressions.