Why string handling matters in C Sharp (C#) - Test Your Understanding

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'

A12345

B"Hello, world!"

CHello, world!

Dtrue

Attempts:

3 left

💡 Hint

Common Mistakes

Forgetting the double quotes around the text.

Using single quotes which are for characters, not strings.

Strings in C# must be enclosed in double quotes. So, "Hello, world!" is the correct way to assign a string.

2fill in blank

medium

Complete the code to get the length of the string stored in name.

C Sharp (C#)

int length = name.[1];

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

ALength

Blength()

Ccount

Dsize

Attempts:

3 left

💡 Hint

Common Mistakes

Using length() with parentheses which causes an error.

Using lowercase 'length' which is not recognized.

In C#, the Length property (capital L) gives the number of characters in a string.

3fill in blank

hard

Fix the error in the code to convert the string input to uppercase.

C Sharp (C#)

string upper = input.[1]();

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

AToUpper

Btoupper

CToLower

Dtouppercase

Attempts:

3 left

💡 Hint

Common Mistakes

Using lowercase method names which do not exist.

Confusing ToUpper with ToLower.

The correct method to convert a string to uppercase in C# is ToUpper() with capital T and U.

4fill in blank

hard

Fill both blanks to create a substring from index 2 with length 4.

C Sharp (C#)

string part = text.[1](2, [2]);

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

ASubstring

BSubstr

C4

D5

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'Substr' which is not a C# method.

Confusing the length argument with the end index.

The Substring method extracts part of a string starting at the given index and for the given length.

5fill in blank

hard

Fill all three blanks to check if the string message contains 'hello' ignoring case.

C Sharp (C#)

bool containsHello = message.[1]("hello", [2].[3]);

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

AContains

BStringComparison

COrdinalIgnoreCase

DEquals

Attempts:

3 left

💡 Hint

Common Mistakes

Using Equals instead of Contains for substring check.

Not passing the StringComparison argument, so case is considered.

The Contains method can take a StringComparison argument to ignore case. Use StringComparison.OrdinalIgnoreCase for case-insensitive check.