Flags attribute and bitwise enums in C Sharp (C#) - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define an enum with the Flags attribute.

C Sharp (C#)

[[1]]
public enum Days
{
    None = 0,
    Sunday = 1,
    Monday = 2
}

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ASerializable

BFlags

CObsolete

DDataContract

Attempts:

3 left

💡 Hint

Common Mistakes

Using an unrelated attribute like Serializable instead of Flags.

Forgetting to add the attribute entirely.

The Flags attribute allows an enum to be treated as a bit field, enabling bitwise operations.

2fill in blank

medium

Complete the code to define enum values as powers of two for bitwise combination.

C Sharp (C#)

public enum Permissions
{
    Read = 1,
    Write = [1],
    Execute = 4
}

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A3

B5

C2

D6

Attempts:

3 left

💡 Hint

Common Mistakes

Using values that are not powers of two, which breaks bitwise uniqueness.

Enum values for flags should be powers of two (1, 2, 4, 8, ...) to allow unique bitwise combinations.

3fill in blank

hard

Fix the error in combining flags using bitwise OR operator.

C Sharp (C#)

Permissions userPermissions = Permissions.Read [1] Permissions.Write;

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A+

B^

C&

D|

Attempts:

3 left

💡 Hint

Common Mistakes

Using '+' which adds values but is not correct for flags.

Using '&' which is bitwise AND and only keeps common bits.

The bitwise OR operator | combines flags correctly by setting bits from both operands.

4fill in blank

hard

Fill both blanks to check if a flag is set using bitwise AND and compare to the flag.

C Sharp (C#)

if ((userPermissions [1] Permissions.Write) [2] Permissions.Write)
{
    Console.WriteLine("Write permission granted.");
}

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A&

B==

C!=

D|

Attempts:

3 left

💡 Hint

Common Mistakes

Using '|' instead of '&' in the check.

Using '!=' instead of '==' for comparison.

To check if a flag is set, use bitwise AND '&' and compare with '==' to the flag value.

5fill in blank

hard

Fill all three blanks to define a Flags enum, combine flags, and check if a flag is set.

C Sharp (C#)

[[1]]
public enum Access
{
    None = 0,
    Read = 1,
    Write = 2
}

Access accessRights = Access.Read [2] Access.Write;

bool canWrite = (accessRights [3] Access.Write) == Access.Write;

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AFlags

B|

C&

DSerializable

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong attribute like Serializable.

Using '+' instead of '|' to combine flags.

Using '|' instead of '&' to check flags.

The Flags attribute marks the enum for bitwise use. Combine flags with | and check flags with &.