<aside> Variables are fundamental building blocks in programming that store and manage data. Think of them as labeled containers that hold different types of information.

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📦 Understanding Variables

Variables in C# act as containers for data. Just like a labeled box, they store information that can be used and modified throughout your code.

<aside> 💡 Best Practice: Always name variables descriptively to indicate their purpose. For example, use 'customerAge' instead of just 'a'.

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Variable Declaration Examples

// Basic variable declaration and assignment
string customerName = "John";
int age = 25;
bool isActive = true;

// Multiple declarations
int x = 10, y = 20, z = 30;

// Declaration now, assignment later
string status;
status = "Ready";

🏷️ Naming Conventions

✅ Use camelCase for variables (firstName, orderTotal)
✅ Make names descriptive (customerAge vs a)
✅ Avoid abbreviations unless widely known
❌ Don't start with numbers
❌ Don't use reserved keywords

🧮 Arithmetic Operations

C# supports various mathematical operations for numerical calculations.

Basic Operators

Operator	Description	Example
+=	Add and assign	x += 5; // Same as x = x + 5
-=	Subtract and assign	x -= 3; // Same as x = x - 3
*=	Multiply and assign	x = 2; // Same as x = x 2
/=	Divide and assign	x /= 4; // Same as x = x / 4
++	Increment by 1	x++; // Same as x = x + 1
--	Decrement by 1	x--; // Same as x = x - 1

📝 Example Operations

int number = 10;
number += 5;      // number is now 15
number *= 2;      // number is now 30
number--;         // number is now 29

// More complex calculations
int result = (number * 2) + (15 / 3);  // Mathematical expression
double average = (value1 + value2) / 2.0;  // Calculate average

🔢 Number Types in Calculations

Use int for whole number calculations