String type and immutability in C Sharp (C#) - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare a string variable named greeting.

C Sharp (C#)

string greeting = [1];

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

AHello

B"Hello"

C'Hello'

Dnew String("Hello")

Attempts:

3 left

💡 Hint

Common Mistakes

Using single quotes instead of double quotes for strings.

Not using quotes at all around the text.

Strings in C# must be enclosed in double quotes to be valid string literals.

2fill in blank

medium

Complete the code to concatenate two strings greeting and name.

C Sharp (C#)

string message = greeting [1] name;

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A/

B-

C*

D+

Attempts:

3 left

💡 Hint

Common Mistakes

Using subtraction or multiplication operators instead of plus.

Forgetting to add a space between words.

The plus sign (+) is used to join strings together in C#.

3fill in blank

hard

Fix the error in the code to correctly assign a new value to the string variable.

C Sharp (C#)

string name = "Alice";
name [1] "Bob";

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A+=

B==

C=

D===

Attempts:

3 left

💡 Hint

Common Mistakes

Using == instead of = for assignment.

Using += which appends instead of replacing.

To assign a new value to a string variable, use the single equals sign (=).

4fill in blank

hard

Fill both blanks to create a new string that replaces part of the original string.

C Sharp (C#)

string original = "Hello World";
string modified = original.[1]("World", [2]);

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

AReplace

B"C#"

C"CSharp"

DRemove

Attempts:

3 left

💡 Hint

Common Mistakes

Using Remove instead of Replace.

Not putting the new text in quotes.

The Replace method changes part of the string. The second argument is the new text in quotes.

5fill in blank

hard

Fill all three blanks to create a new string with trimmed spaces and converted to uppercase.

C Sharp (C#)

string messy = "  hello world  ";
string clean = messy.[1]().[2]().[3]();

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

ATrim

BToUpper

CToLower

DReplace

Attempts:

3 left

💡 Hint

Common Mistakes

Using ToLower instead of ToUpper.

Not trimming spaces before changing case.

Trim() removes leading and trailing whitespace. ToUpper() converts the string to uppercase letters. The second ToUpper() call is redundant but completes the required three-method chain, resulting in "HELLO WORLD".