Why C# and the .NET ecosystem - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare a variable of type string in C#.

C Sharp (C#)

string name = [1];

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

Aint

BJohn

C"John"

Dvar

Attempts:

3 left

💡 Hint

Common Mistakes

Forgetting the quotes around the string value.

In C#, string values must be enclosed in double quotes.

2fill in blank

medium

Complete the code to create a simple method that returns an integer in C#.

C Sharp (C#)

public int GetNumber() {
    return [1];
}

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

A5

B"5"

Cfive

Dint

Attempts:

3 left

💡 Hint

Common Mistakes

Returning a string instead of an integer.

The method returns the integer 5 without quotes because quotes make it a string.

3fill in blank

hard

Fix the error in the code to correctly instantiate a List of strings in C#.

C Sharp (C#)

List<string> names = new [1]();

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ASet

BDictionary

CArray

DList<string>

Attempts:

3 left

💡 Hint

Common Mistakes

Using Array or Dictionary instead of List.

To create a list of strings, use new List<string>().

4fill in blank

hard

Fill both blanks to create a dictionary with string keys and int values in C#.

C Sharp (C#)

Dictionary<[1], [2]> ages = new Dictionary<[1], [2]>();

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Astring

Bint

Cfloat

Dbool

Attempts:

3 left

💡 Hint

Common Mistakes

Using float or bool instead of int for values.

Dictionaries need a key type and a value type. Here, keys are strings and values are integers.

5fill in blank

hard

Fill all three blanks to create a simple class with a property and a method in C#.

C Sharp (C#)

public class Person {
    public [1] Name { get; set; }
    public [2] Age { get; set; }
    public void [3]() {
        Console.WriteLine($"Name: {Name}, Age: {Age}");
    }
}

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

Astring

Bint

CDisplay

DShow

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong types or method names that are not verbs.

The class has a string property for Name, an int property for Age, and a method named Display to print info.