Type patterns in C Sharp (C#) - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to check if the object is an integer using a type pattern.

C Sharp (C#)

if (obj is [1] number) {
    Console.WriteLine($"Number: {number}");
}

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

Astring

Bint

Cbool

Ddouble

Attempts:

3 left

💡 Hint

Common Mistakes

Using a wrong type like 'string' instead of 'int'.

Forgetting to declare the variable after the type.

The 'is' keyword with 'int' checks if obj is an integer and assigns it to 'number'.

2fill in blank

medium

Complete the code to check if the object is a string and has length greater than 5.

C Sharp (C#)

if (obj is [1] text && text.Length > 5) {
    Console.WriteLine($"Long text: {text}");
}

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

Aint

Bdouble

Cstring

Dbool

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'int' instead of 'string' for text.

Not declaring the variable after the type.

The 'is string text' pattern checks if obj is a string and assigns it to 'text'.

3fill in blank

hard

Fix the error in the type pattern to correctly check for a double value.

C Sharp (C#)

if (obj is [1] value) {
    Console.WriteLine($"Double value: {value}");
}

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

Adouble

Bint

Cstring

Dbool

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'int' instead of 'double'.

Using 'string' or 'bool' for numeric checks.

The correct type to check for a double value is 'double'.

4fill in blank

hard

Fill both blanks to create a type pattern that checks if obj is a bool and true.

C Sharp (C#)

if (obj is [1] flag && flag [2] true) {
    Console.WriteLine("Flag is true");
}

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

Abool

B==

C!=

Dint

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'int' instead of 'bool' for the type.

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

The pattern checks if obj is a bool and if the flag equals true.

5fill in blank

hard

Fill both blanks to create a type pattern that checks if obj is a string with length less than 4 and prints it.

C Sharp (C#)

if (obj is [1] text && text.Length [2] 4) {
    Console.WriteLine($"Short text: {text}");
}

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

Aint

B<

Cstring

D>

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'int' instead of 'string' for the type.

Using '>' instead of '<' for the length comparison.

The code checks if obj is a string and if its length is less than 4.