Operator precedence in C++ - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to correctly calculate the result using operator precedence.

C++

int result = 3 + 4 * [1];

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

A1

B5

C0

D2

Attempts:

3 left

💡 Hint

Common Mistakes

Adding 3 and 4 first, then multiplying by 2.

Ignoring operator precedence and calculating left to right.

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

2fill in blank

medium

Complete the code to correctly evaluate the expression with mixed operators.

C++

int value = (10 - 2) [1] 3 + 4;

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

A*

B/

C-

D+

Attempts:

3 left

💡 Hint

Common Mistakes

Adding 3 and 4 before multiplying.

Ignoring parentheses and operator precedence.

Parentheses are evaluated first: (10 - 2) = 8. Then multiplication (*) has higher precedence than addition (+), so 8 * 3 = 24, then add 4 to get 28.

3fill in blank

hard

Fix the error in the expression to get the correct result.

C++

int result = 20 / 4 [1] 2;

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

A-

B*

C+

D/

Attempts:

3 left

💡 Hint

Common Mistakes

Using addition or subtraction instead of multiplication.

Assuming multiplication has higher precedence than division.

Division and multiplication have the same precedence and are evaluated left to right. So 20 / 4 = 5, then 5 * 2 = 10.

4fill in blank

hard

Fill both blanks to correctly compute the expression using operator precedence.

C++

int x = 5 + 3 [1] 2 [2] 4;

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

A*

B+

C-

D/

Attempts:

3 left

💡 Hint

Common Mistakes

Doing addition before multiplication.

Mixing up subtraction and division.

Multiplication (*) has higher precedence, so 3 * 2 = 6. Then subtraction (-) is done: 6 - 4 = 2. Finally, addition: 5 + 2 = 7.

5fill in blank

hard

Fill all three blanks to correctly evaluate the complex expression.

C++

int result = (8 [1] 4) [2] 2 [3] 3;

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

A+

B*

C-

D/

Attempts:

3 left

💡 Hint

Common Mistakes

Ignoring parentheses.

Doing multiplication before division regardless of order.

Mixing up operator precedence.

First, inside parentheses: 8 - 4 = 4. Then division and multiplication have the same precedence and are evaluated left to right: 4 / 2 = 2, then 2 * 3 = 6.