List generic collection in C Sharp (C#) - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare a list of integers.

C Sharp (C#)

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

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Aint

Bstring

Cdouble

Dbool

Attempts:

3 left

💡 Hint

Common Mistakes

Using a type other than int when the list is meant for integers.

Forgetting to specify the generic type parameter.

The generic type parameter for the list should be int to create a list of integers.

2fill in blank

medium

Complete the code to add an element to the list.

C Sharp (C#)

numbers.[1](5);

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AInsert

BAppend

CPush

DAdd

Attempts:

3 left

💡 Hint

Common Mistakes

Using Append which is not a method of List in C#.

Using Push which is used in stacks, not lists.

The Add method is used to add an element to the end of a List in C#.

3fill in blank

hard

Fix the error in accessing the first element of the list.

C Sharp (C#)

int first = numbers[[1]];

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A-1

B1

C0

Dnumbers.Count

Attempts:

3 left

💡 Hint

Common Mistakes

Using 1 as the index to get the first element.

Using -1 which is invalid index in C# lists.

List indexing in C# starts at 0, so the first element is at index 0.

4fill in blank

hard

Fill both blanks to create a list of strings and add a value.

C Sharp (C#)

List<[1]> names = new List<[2]>();
names.Add("Alice");

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Astring

Bint

Cdouble

Dbool

Attempts:

3 left

💡 Hint

Common Mistakes

Using different types in the declaration and instantiation.

Using numeric types instead of string.

To create a list of strings, the generic type parameter must be string in both places.

5fill in blank

hard

Fill all three blanks to create a list, add an element, and get the count.

C Sharp (C#)

List<[1]> items = new List<[2]>();
items.[3](10);
int count = items.Count;

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

Aint

Bstring

CAdd

DRemove

Attempts:

3 left

💡 Hint

Common Mistakes

Using Remove instead of Add to add elements.

Using string as the generic type when adding integers.

The list is of integers, so the generic type is int. To add an element, use the Add method.