String comparison and equality in C Sharp (C#) - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to check if two strings are equal using the == operator.

C Sharp (C#)

string a = "hello";
string b = "hello";
bool areEqual = a [1] b;

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A==

B!=

C=

DEquals

Attempts:

3 left

💡 Hint

Common Mistakes

Using = instead of == causes assignment, not comparison.

Using != checks for inequality, not equality.

The == operator compares the content of two strings for equality in C#.

2fill in blank

medium

Complete the code to compare two strings ignoring case using String.Equals method.

C Sharp (C#)

string a = "Hello";
string b = "hello";
bool areEqual = String.Equals(a, b, [1]);

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AStringComparison.CurrentCultureIgnoreCase

BStringComparison.Ordinal

CStringComparison.CurrentCulture

DStringComparison.OrdinalIgnoreCase

Attempts:

3 left

💡 Hint

Common Mistakes

Using Ordinal instead of OrdinalIgnoreCase causes case-sensitive comparison.

Using CurrentCulture may depend on system culture settings.

StringComparison.OrdinalIgnoreCase compares strings ignoring case differences.

3fill in blank

hard

Fix the error in the code to correctly compare two strings for equality using the Equals method.

C Sharp (C#)

string a = "test";
string b = "test";
bool areEqual = a.Equals([1]);

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Ab

B"b"

Ca

DEquals

Attempts:

3 left

💡 Hint

Common Mistakes

Passing a string literal "b" instead of variable b.

Calling Equals without any argument causes error.

The Equals method compares the current string with the string passed as argument. Passing variable b compares the two strings.

4fill in blank

hard

Fill both blanks to create a dictionary that maps strings to their lengths, but only include strings with length greater than 3.

C Sharp (C#)

var words = new List<string> { "apple", "bat", "carrot", "dog" };
var lengths = words.ToDictionary(word => word, word => word.[1]);
var filtered = lengths.Where(kv => kv.Value [2] 3).ToDictionary(kv => kv.Key, kv => kv.Value);

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ALength

B<

C>

DCount

Attempts:

3 left

💡 Hint

Common Mistakes

Using Count instead of Length for string length.

Using < 3 instead of > 3 for filtering.

word.Length gets the length of the string. Filtering with > 3 keeps only words longer than 3 characters.

5fill in blank

hard

Fill all three blanks to create a dictionary with uppercase keys and values only for strings that start with 'a'.

C Sharp (C#)

var words = new List<string> { "apple", "banana", "apricot", "cherry" };
var result = words.Where(word => word.[1]("a")).ToDictionary(word => word.[2](), word => word.[3]());

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AStartsWith

BToUpper

DContains

Attempts:

3 left

💡 Hint

Common Mistakes

Using Contains instead of StartsWith for filtering.

Not converting keys or values to uppercase.

StartsWith("a") filters words starting with 'a'. ToUpper() converts strings to uppercase for keys and values.