Underlying numeric values in C Sharp (C#) - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare an enum named Color.

C Sharp (C#)

[1] Color { Red, Green, Blue }

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Aclass

Benum

Cstruct

Dinterface

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'class' instead of 'enum' to declare an enumeration.

The keyword enum is used to declare an enumeration type in C#.

2fill in blank

medium

Complete the code to get the underlying numeric value of the enum member.

C Sharp (C#)

int value = (int)Color.[1];

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ARed

BYellow

CPurple

DOrange

Attempts:

3 left

💡 Hint

Common Mistakes

Using a member name that does not exist in the enum.

To get the numeric value of an enum member, cast it to int and use the member name.

3fill in blank

hard

Fix the error in the code to correctly cast the enum to its underlying value.

C Sharp (C#)

var number = [1]Color.Green;

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A(int)

B(double)

C(string)

D(bool)

Attempts:

3 left

💡 Hint

Common Mistakes

Casting enum to a non-numeric type like string or bool.

To get the numeric value of an enum member, cast it to int.

4fill in blank

hard

Fill both blanks to create a dictionary mapping enum members to their numeric values.

C Sharp (C#)

var dict = new Dictionary<Color, int> { [1], [2] };

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A{Color.Red, (int)Color.Red}

B{Color.Yellow, (int)Color.Yellow}

C{Color.Green, (int)Color.Green}

D{Color.Blue, (int)Color.Blue}

Attempts:

3 left

💡 Hint

Common Mistakes

Using enum members that do not exist.

Not casting enum members to int for values.

The dictionary keys are enum members and values are their underlying int values.

5fill in blank

hard

Fill all three blanks to create a LINQ expression mapping enum members to their numeric values if the value is greater than 0.

C Sharp (C#)

var result = Enum.GetValues(typeof(Color)).Cast<Color>().Where([3] => (int)[3] > 0).ToDictionary([1] => [1], [1] => [2]);

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Acolor

B(int)color

CColor

Dvar

Attempts:

3 left

💡 Hint

Common Mistakes

Using the enum type name instead of a variable in the loop.

Not casting the enum member to int for the value.

This uses LINQ's ToDictionary method along with Where to map each qualifying enum member to its int value.