Variables and Data Types

In C#, variables are used to store and manipulate data. Before using a variable, you need to declare it with a specific data type. C# provides several built-in data types to accommodate different kinds of values.

Integer Variables

Integer variables are used to store whole numbers without any decimal places. In C#, you can declare an integer variable using the int keyword. Here's an example:

1int age = 30;

In this example, the variable age is declared as an integer and assigned a value of 30.

Floating-Point Variables

Floating-point variables are used to store numbers with decimal places. In C#, you can declare a floating-point variable using the double keyword. Here's an example:

1double height = 1.75;

In this example, the variable height is declared as a double and assigned a value of 1.75.

String Variables

String variables are used to store sequences of characters, such as names, addresses, or messages. In C#, you can declare a string variable using the string keyword. Here's an example:

1string name = "John";

In this example, the variable name is declared as a string and assigned the value "John".

Boolean Variables

Boolean variables are used to store either true or false values. In C#, you can declare a boolean variable using the bool keyword. Here's an example:

1bool isStudent = true;

In this example, the variable isStudent is declared as a boolean and assigned the value true.

Character Variables

Character variables are used to store single characters. In C#, you can declare a character variable using the char keyword. Characters are enclosed in single quotes. Here's an example:

1char gender = 'M';

In this example, the variable gender is declared as a character and assigned the value 'M'.

By declaring variables with the appropriate data types, you can ensure that the values you store and manipulate are compatible with the operations you want to perform.

Now, let's write some code to see these variable declarations in action:

1using System;
2
3public class Program
4{
5    public static void Main()
6    {
7        // Integer Variables
8        int age = 30;
9        Console.WriteLine("My age is " + age);
10
11        // Floating-Point Variables
12        double height = 1.75;
13        Console.WriteLine("My height is " + height);
14
15        // String Variables
16        string name = "John";
17        Console.WriteLine("My name is " + name);
18
19        // Boolean Variables
20        bool isStudent = true;
21        Console.WriteLine("Am I a student? " + isStudent);
22
23        // Character Variables
24        char gender = 'M';
25        Console.WriteLine("My gender is " + gender);
26    }
27}

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using System;

​

public class Program

{

    public static void Main()

    {

        // Integer Variables

        int age = 30;

        Console.WriteLine("My age is " + age);

​

        // Floating-Point Variables

        double height = 1.75;

        Console.WriteLine("My height is " + height);

​

        // String Variables

        string name = "John";

        Console.WriteLine("My name is " + name);

​

        // Boolean Variables

        bool isStudent = true;

        Console.WriteLine("Am I a student? " + isStudent);

​

        // Character Variables

        char gender = 'M';

        Console.WriteLine("My gender is " + gender);

    }

}