Variable declaration and initialization in C Sharp (C#)

Introduction

Variables store information you want to use later. Declaring and initializing them sets up a name and a value to remember.

When you want to save a number to use in calculations.

When you need to keep text like a name or message.

When you want to store a true/false answer.

When you want to change a value step-by-step in your program.

When you want to remember user input or results.

Syntax

C Sharp (C#)

type variableName = value;

type is the kind of data (like int, string, bool).

You can declare a variable without a value, but it's best to initialize it right away.

Examples

Declares an integer variable named age and sets it to 25.

C Sharp (C#)

int age = 25;

Declares a string variable named name and sets it to "Alice".

C Sharp (C#)

string name = "Alice";

Declares a boolean variable named isSunny and sets it to true.

C Sharp (C#)

bool isSunny = true;

Declares a double variable named price and sets it to 19.99.

C Sharp (C#)

double price = 19.99;

Sample Program

This program declares three variables with different types and prints their values.

C Sharp (C#)

using System;

class Program
{
    static void Main()
    {
        int age = 30;
        string city = "Paris";
        bool isRaining = false;

        Console.WriteLine($"Age: {age}");
        Console.WriteLine($"City: {city}");
        Console.WriteLine($"Is it raining? {isRaining}");
    }
}

Important Notes

Variable names should be clear and meaningful.

Use camelCase for variable names in C# (start with lowercase letter).

Once declared, you can change the variable's value later if needed.

Summary

Variables hold data with a name and a type.

Declaration sets the variable's type and name.

Initialization gives the variable its first value.