Variables and Data Types

In C#, variables are used to store and manipulate data. Before using a variable, it must be declared with a specific data type. C# provides several built-in data types, including integers, floating-point numbers, characters, booleans, and strings.

Declaring Variables

To declare a variable in C#, you need to specify its data type followed by the variable name. Here are some examples:

1int age;
2string name;
3bool isEmployed;

Initializing Variables

To assign a value to a variable, you can use the assignment operator =. Here's how you can initialize the variables:

1age = 30;
2name = "John Doe";
3isEmployed = true;

Data Types

C# supports various data types, including:

• int: Used for storing integer numbers
• double: Used for storing floating-point numbers
• char: Used for storing single characters
• string: Used for storing sequences of characters
• bool: Used for storing boolean values

Here's how you can declare and initialize variables of different data types:

1int score = 100;
2double temperature = 98.6;
3char grade = 'A';
4string message = "Hello, World!";
5bool isValid = true;

Type Inference

In C#, you can use the var keyword to declare a variable without explicitly specifying its data type. The C# compiler infers the data type based on the assigned value. Here are some examples:

1var number = 42;
2var price = 9.99;
3var letter = 'X';
4var greeting = "Hello!";
5var status = true;

Printing Variables

To display the value of a variable, you can use the Console.WriteLine() method. Here's an example:

1Console.WriteLine("Age: " + age);
2Console.WriteLine("Name: " + name);
3Console.WriteLine("Employment Status: " + isEmployed);

You can use the same method to print variables of different data types:

1Console.WriteLine("Score: " + score);
2Console.WriteLine("Temperature: " + temperature);
3Console.WriteLine("Grade: " + grade);
4Console.WriteLine("Message: " + message);
5Console.WriteLine("isValid: " + isValid);

Type inference can also be used when printing variables:

1Console.WriteLine("Number: " + number);
2Console.WriteLine("Price: " + price);
3Console.WriteLine("Letter: " + letter);
4Console.WriteLine("Greeting: " + greeting);
5Console.WriteLine("Status: " + status);

xxxxxxxxxx

Console.WriteLine("Status: " + status);

# Example 1: Declaring Variables

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// Declare an int variable

int age;

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// Declare a string variable

string name;

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// Declare a boolean variable

bool isEmployed;

​

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# Example 2: Initializing Variables

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// Initialize the age variable

age = 30;

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// Initialize the name variable

name = "John Doe";

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// Initialize the isEmployed variable

isEmployed = true;

​

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# Example 3: Data Types

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// Declare and initialize variables of different data types

int score = 100;

double temperature = 98.6;