Checked and unchecked arithmetic in C Sharp (C#) - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to enable overflow checking for the addition.

C Sharp (C#)

checked {
    int result = 1000000 [1] 3000;
}

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

A+

B-

C*

D/

Attempts:

3 left

💡 Hint

Common Mistakes

Using subtraction or multiplication instead of addition.

Forgetting to use the checked block for overflow detection.

The checked block ensures that the addition operation throws an exception if overflow occurs. The operator for addition is +.

2fill in blank

medium

Complete the code to disable overflow checking for the multiplication.

C Sharp (C#)

unchecked {
    int result = 20000 [1] 2000;
}

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

A-

B/

C+

D*

Attempts:

3 left

💡 Hint

Common Mistakes

Using addition or division instead of multiplication.

Expecting overflow exceptions inside unchecked blocks.

The unchecked block disables overflow checking. The operator for multiplication is *.

3fill in blank

hard

Fix the error in the code to correctly check for overflow during subtraction.

C Sharp (C#)

checked {
    int result = 1000 [1] 2000;
}

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

A+

B/

C-

D*

Attempts:

3 left

💡 Hint

Common Mistakes

Using addition or multiplication instead of subtraction.

Not using checked block for overflow detection.

The subtraction operator is -. Using it inside a checked block will detect overflow during subtraction.

4fill in blank

hard

Fill both blanks to create a dictionary with keys as numbers and values as their squares, using checked arithmetic for multiplication and a condition to include only squares less than 100.

C Sharp (C#)

var squares = new Dictionary<int, int> {
    { [1], checked([1] [2] [1]) }
};

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

A5

B*

C10

D3

Attempts:

3 left

💡 Hint

Common Mistakes

Using a number other than 5 for the key.

Using addition or division instead of multiplication.

The key is 5 and the value is its square using multiplication * inside checked to detect overflow.

5fill in blank

hard

Fill all three blanks to create a checked block that divides two numbers and assigns the result to a variable.

C Sharp (C#)

checked {
    int result = [1] [2] [3];
}

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

A100

B/

C5

D*

Attempts:

3 left

💡 Hint

Common Mistakes

Using multiplication instead of division.

Swapping the numbers causing wrong division.

The expression divides 100 by 5 using the division operator / inside a checked block to detect overflow or exceptions.