Default values for types in C Sharp (C#) - Mini Project: Build & Apply

Default values for types

📖 Scenario: Imagine you are creating a simple program to understand what default values different types have in C#. This helps when you declare variables but don't assign values yet.

🎯 Goal: You will create variables of different types and print their default values to see what C# assigns automatically.

📋 What You'll Learn

Create variables of type int, bool, and string without assigning values.

Create a variable called defaultInt and set it to the default value of int using default keyword.

Create a variable called defaultBool and set it to the default value of bool using default keyword.

Create a variable called defaultString and set it to the default value of string using default keyword.

Print the values of defaultInt, defaultBool, and defaultString.

💡 Why This Matters

🌍 Real World

Knowing default values helps when you declare variables and want to understand what initial values they hold before assignment.

💼 Career

Understanding default values is important for debugging and writing safe code that avoids unexpected behaviors.

1

Create variables without assigning values

Create variables called number of type int, flag of type bool, and text of type string without assigning any values.

C Sharp (C#)

// Declare variables without assigning values
int number;
bool flag;
string text;
// Your code here

Need a hint?

Just declare the variables with their types and names, but do not assign any values.

2

Assign default values using default keyword

Create variables called defaultInt, defaultBool, and defaultString. Assign them the default values of int, bool, and string respectively using the default keyword.

C Sharp (C#)

int number;
bool flag;
string text;
// Assign default values
int defaultInt = default(int);
bool defaultBool = default(bool);
string defaultString = default(string);
// Your code here

Need a hint?

Use the syntax type variable = default(type); to get the default value for each type.

3

Print the default values

Use Console.WriteLine to print the values of defaultInt, defaultBool, and defaultString each on its own line.

C Sharp (C#)

int number;
bool flag;
string text;
int defaultInt = default(int);
bool defaultBool = default(bool);
string defaultString = default(string);
// Print the default values
Console.WriteLine(defaultInt);
Console.WriteLine(defaultBool);
Console.WriteLine(defaultString);
// Your code here

Need a hint?

Use Console.WriteLine(variable); to print each variable's value.

4

Run the program to see the output

Run the program and observe the output. It should print the default values of int, bool, and string types in order.

C Sharp (C#)

int number;
bool flag;
string text;
int defaultInt = default(int);
bool defaultBool = default(bool);
string defaultString = default(string);
Console.WriteLine(defaultInt);
Console.WriteLine(defaultBool);
Console.WriteLine(defaultString);
// Run the program to see output

Need a hint?

The output shows 0 for int, False for bool, and an empty line for string because its default is null.