Implicit typing with var keyword in C Sharp (C#) - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare an implicitly typed variable holding the number 10.

C Sharp (C#)

var number = [1];

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

A"10"

Bnumber

C10

Dvar

Attempts:

3 left

💡 Hint

Common Mistakes

Putting quotes around 10 makes it a string, not an int.

Trying to assign 'var' as a value is incorrect.

The var keyword lets the compiler infer the type from the assigned value. Here, 10 is an integer, so number becomes an int.

2fill in blank

medium

Complete the code to declare an implicitly typed variable holding the text "hello".

C Sharp (C#)

var greeting = [1];

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

A"hello"

Bhello

C'hello'

Dgreeting

Attempts:

3 left

💡 Hint

Common Mistakes

Using single quotes for strings is invalid in C#.

Not using quotes makes the compiler think it's a variable name.

The var keyword infers the type from the assigned value. Text must be in double quotes to be a string in C#.

3fill in blank

hard

Fix the error in the code by completing the declaration of an implicitly typed variable holding a decimal number.

C Sharp (C#)

var price = [1]m;

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

A19.99

B19,99

C"19.99"

Dprice

Attempts:

3 left

💡 Hint

Common Mistakes

Using commas instead of dots for decimals.

Putting the number in quotes makes it a string, not a decimal.

Decimal literals in C# require the suffix m. The number must be written with a dot, not a comma, and without quotes.

4fill in blank

hard

Complete the code to declare an implicitly typed variable holding a list of integers and initialize it with values 1, 2, and 3.

C Sharp (C#)

var numbers = new [1]<int> {1, 2, 3};

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A()

BList

C[]

DArray

Attempts:

3 left

💡 Hint

Common Mistakes

Using parentheses instead of curly braces for initialization.

Using 'Array' without proper syntax for initialization.

To create a list of integers, use List<int> and initialize it with curly braces { } containing the values.

5fill in blank

hard

Complete the code to declare an implicitly typed variable holding a dictionary with string keys and int values, initialized with two entries.

C Sharp (C#)

var ages = new Dictionary<[1], [2]> { {"Alice", 30}, {"Bob", 25} };

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

Astring

Bint

C{}

D[]

Attempts:

3 left

💡 Hint

Common Mistakes

Using square brackets instead of curly braces for initialization.

Mixing up key and value types.

The dictionary keys are strings and values are integers. Use curly braces { } to initialize the dictionary with key-value pairs.