Common string methods in C Sharp (C#) - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to convert the string to uppercase.

C Sharp (C#)

string text = "hello";
string result = text.[1]();

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

AToUpper

BToLower

CTrim

DReplace

Attempts:

3 left

💡 Hint

Common Mistakes

Using ToLower() which converts to lowercase instead.

Using Trim() which removes spaces but does not change case.

The ToUpper() method converts all characters in the string to uppercase.

2fill in blank

medium

Complete the code to check if the string starts with "Hi".

C Sharp (C#)

string greeting = "Hi there!";
bool startsWithHi = greeting.[1]("Hi");

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

AStartsWith

BIndexOf

CEndsWith

DContains

Attempts:

3 left

💡 Hint

Common Mistakes

Using Contains() which checks anywhere in the string.

Using EndsWith() which checks the end of the string.

The StartsWith() method checks if the string begins with the specified substring.

3fill in blank

hard

Fix the error in the code to find the position of 'a' in the string.

C Sharp (C#)

string word = "banana";
int position = word.[1]('a');

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ALocate

BFind

CIndexOf

DSearch

Attempts:

3 left

💡 Hint

Common Mistakes

Using Find() which does not exist for strings in C#.

Using Locate() or Search() which are not valid string methods.

The IndexOf() method returns the position of the first occurrence of a character.

4fill in blank

hard

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

C Sharp (C#)

string text = "Programming";
string part = text.[1]([2], 4);

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ASubstring

BRemove

C2

D4

Attempts:

3 left

💡 Hint

Common Mistakes

Using Remove() which deletes characters instead of extracting.

Using wrong starting index like 4.

The Substring method extracts part of the string starting at the given index. Here, index 2 means starting from the third character.

5fill in blank

hard

Fill all three blanks to replace 'cat' with 'dog' in the string.

C Sharp (C#)

string sentence = "The cat sat on the mat.";
string newSentence = sentence.[1]("[2]", "[3]");

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

AReplace

Bcat

Cdog

DRemove

Attempts:

3 left

💡 Hint

Common Mistakes

Using Remove() which deletes text instead of replacing.

Swapping the order of 'cat' and 'dog'.

The Replace method replaces all occurrences of a substring with another substring.