Expression-bodied methods in C Sharp (C#) - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define an expression-bodied method that returns the square of a number.

C Sharp (C#)

public int Square(int x) => x [1] x;

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A-

B+

C*

D/

Attempts:

3 left

💡 Hint

Common Mistakes

Using '+' instead of '*' will add the number to x instead of squaring.

Using '-' or '/' will not calculate the square.

The expression-bodied method uses the multiplication operator '*' to return the square of x.

2fill in blank

medium

Complete the expression-bodied method to return the length of a string parameter.

C Sharp (C#)

public int GetLength(string s) => s.[1];

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ALength

BLength()

CCount

DSize

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'Length()' causes a syntax error because Length is a property, not a method.

Using 'Count' or 'Size' are not valid string properties in C#.

The Length property returns the number of characters in the string.

3fill in blank

hard

Fix the error in the expression-bodied method that returns the uppercase version of a string.

C Sharp (C#)

public string ToUpperCase(string s) => s.[1]();

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AToUpper

Btoupper

Ctouppercase

DUpperCase

Attempts:

3 left

💡 Hint

Common Mistakes

Using lowercase 'toupper' causes a compile error.

Using 'touppercase' or 'UpperCase' are not valid method names.

The correct method name is 'ToUpper' with capital T and U.

4fill in blank

hard

Fill both blanks to create an expression-bodied method that returns true if a number is even.

C Sharp (C#)

public bool IsEven(int num) => num [1] 2 [2] 0;

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A%

B==

C!=

D/

Attempts:

3 left

💡 Hint

Common Mistakes

Using '/' instead of '%' will not give the remainder.

Using '!=' instead of '==' will return true for odd numbers.

The method uses the modulus operator '%' to get the remainder and checks if it equals zero with '=='.

5fill in blank

hard

Fill all three blanks to create an expression-bodied method that returns a dictionary with words as keys and their lengths as values for words longer than 3 characters.

C Sharp (C#)

public Dictionary<string, int> WordLengths(List<string> words) => words.Where(w => w.[1] > [2]).ToDictionary(w => w, w => w.[3]);

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

ALength

B3

DCount

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'Count' instead of 'Length' for strings causes errors.

Using a number other than 3 changes the filter condition.

The method filters words with Length > 3 and creates a dictionary with word lengths using the Length property.