Why strong typing matters in C# - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare a strongly typed integer variable in C#.

C Sharp (C#)

int number = [1];

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

Atrue

B"10"

C10

Dnull

Attempts:

3 left

💡 Hint

Common Mistakes

Assigning a string value like "10" to an int variable.

Using true or null which are not integers.

In C#, int variables must be assigned integer values like 10. Assigning a string or other types causes errors.

2fill in blank

medium

Complete the code to declare a strongly typed string variable in C#.

C Sharp (C#)

string greeting = [1];

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

A100

Bnull

Ctrue

D"Hello"

Attempts:

3 left

💡 Hint

Common Mistakes

Assigning numbers or booleans to a string variable without quotes.

Forgetting the quotes around the text.

Strings in C# must be enclosed in double quotes. So "Hello" is correct.

3fill in blank

hard

Fix the error in the code by choosing the correct type for the variable.

C Sharp (C#)

var isActive = [1];

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

Anull

Btrue

C1

D"true"

Attempts:

3 left

💡 Hint

Common Mistakes

Using "true" as a string instead of boolean true.

Using numbers like 1 instead of boolean values.

The variable isActive should be a boolean. The value true without quotes is the correct boolean literal.

4fill in blank

hard

Fill both blanks to create a strongly typed list of integers and add a number to it.

C Sharp (C#)

List<int> numbers = new [1]();
numbers.[2](5);

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

AList<int>

BAdd

CAddRange

DArrayList

Attempts:

3 left

💡 Hint

Common Mistakes

Using ArrayList which is not strongly typed.

Using AddRange which expects a collection, not a single item.

We create a new List<int> and use the Add method to add a single integer.

5fill in blank

hard

Fill all three blanks to declare a strongly typed dictionary and add a key-value pair.

C Sharp (C#)

Dictionary<[1], [2]> capitals = new Dictionary<[3], string>();
capitals.Add("France", "Paris");

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

Astring

Bint

Dbool

Attempts:

3 left

💡 Hint

Common Mistakes

Using int or bool for keys or values incorrectly.

Mismatching types between declaration and constructor.

The dictionary uses string as the key type and string as the value type. So both key and value types are string.