Operator precedence in Rust - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to correctly calculate the result of 3 + 4 * 2.

Rust

let result = 3 + 4 [1] 2;
println!("{}", result);

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

A+

B/

C-

D*

Attempts:

3 left

💡 Hint

Common Mistakes

Using '+' instead of '*' causes addition to happen first, changing the result.

The multiplication operator * has higher precedence than addition, so 4 * 2 is calculated first, then added to 3.

2fill in blank

medium

Complete the code to correctly calculate the result of (3 + 4) * 2.

Rust

let result = (3 + 4) [1] 2;
println!("{}", result);

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

A*

B+

C-

D/

Attempts:

3 left

💡 Hint

Common Mistakes

Using '+' instead of '*' ignores the multiplication step.

The parentheses force addition first, then multiplication by 2.

3fill in blank

hard

Fix the error in the expression to correctly compute 10 - 3 * 2 + 1.

Rust

let result = 10 [1] 3 * 2 + 1;
println!("{}", result);

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

A*

B-

C+

D/

Attempts:

3 left

💡 Hint

Common Mistakes

Using '+' instead of '-' changes the meaning of the expression.

The subtraction operator - must be used to get the correct calculation: 10 minus (3 times 2) plus 1.

4fill in blank

hard

Fill both blanks to correctly calculate the expression: 8 + 6 / 3 - 2.

Rust

let result = 8 [1] 6 [2] 3 - 2;
println!("{}", result);

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

A+

B-

C/

D*

Attempts:

3 left

💡 Hint

Common Mistakes

Swapping '+' and '/' changes the calculation order and result.

Division has higher precedence than addition and subtraction, so 6 / 3 is calculated first. Then 8 + (6 / 3) - 2.

5fill in blank

hard

Fill all three blanks to correctly compute the expression: 5 + 4 * 3 - 6 / 2.

Rust

let result = 5 [1] 4 [2] 3 [3] 6 / 2;
println!("{}", result);

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

A+

B*

C-

D/

Attempts:

3 left

💡 Hint

Common Mistakes

Using '+' instead of '-' in the last blank changes the final result.

Multiplication and division have higher precedence than addition and subtraction. So 4 * 3 and 6 / 2 are done first, then addition and subtraction in order.