Stack vs heap mental model in C Sharp (C#) - Interactive Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare a value type variable stored on the stack.

C Sharp (C#)

int [1] = 10;

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Aarray

BmyString

CmyObject

Dnumber

Attempts:

3 left

💡 Hint

Common Mistakes

Using a variable name that suggests a reference type like 'myObject'.

Confusing stack storage with heap storage.

The variable number is a simple integer stored on the stack because it is a value type.

2fill in blank

medium

Complete the code to create a reference type object stored on the heap.

C Sharp (C#)

string [1] = "hello";

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Atext

Bcount

Cvalue

Dindex

Attempts:

3 left

💡 Hint

Common Mistakes

Using variable names that suggest numbers or indexes.

Thinking strings are stored on the stack.

The variable text is a reference type (string) stored on the heap.

3fill in blank

hard

Fix the error in the code to correctly allocate an object on the heap.

C Sharp (C#)

MyClass obj = [1] MyClass();

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Anew

Bcreate

Cmake

Dinit

Attempts:

3 left

💡 Hint

Common Mistakes

Using incorrect keywords like 'create' or 'make'.

Omitting the keyword entirely.

The keyword new is required to create an object on the heap in C#.

4fill in blank

hard

Fill both blanks to create a dictionary that maps keys to values stored on the heap.

C Sharp (C#)

var dict = new Dictionary<[1], [2]>();

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Astring

Bint

Cobject

Dbool

Attempts:

3 left

💡 Hint

Common Mistakes

Using value types like int for keys or values when reference types are expected.

Mixing up keys and values types.

The dictionary uses string keys and object values, both reference types stored on the heap.

5fill in blank

hard

Fill all three blanks to create a list of objects and add a new object to it.

C Sharp (C#)

List<[1]> list = new List<[2]>();
list.[3](new MyClass());

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Aobject

CAdd

DAddRange

Attempts:

3 left

💡 Hint

Common Mistakes

Using different types in the list declaration and constructor.

Using AddRange instead of Add for a single item.

The list holds object types, and the Add method adds a single new object to the list.