Variables are essential building blocks in programming, acting as containers for storing data. Here's a quick guide:

🧠 What is a Variable?

A variable is a named storage location in memory that holds a value.
💻 Example: x = 10 stores the integer 10 in the variable x.

📦 Variable Naming Rules

  • Use letters, numbers, and underscores (_)
  • Cannot start with a number
  • Avoid reserved keywords (e.g., if, else)
  • Case-sensitive (e.g., age vs Age)
  • 🌐 Variables should reflect their purpose clearly

🔄 Data Types

Common types include:

  • Integers (int)
  • Floating points (float)
  • Strings (str)
  • Booleans (bool)
  • Arrays/Lists
  • Objects/Structs

🧩 Scope & Lifetime

Variables can have:

  • Global scope (accessible everywhere)
  • Local scope (limited to a function/block)
  • Static scope (retains value between function calls)

⚙️ Use Cases

  • Storing user input
  • Managing state in applications
  • Performing calculations
  • Passing data between functions

For deeper exploration of data types, check our Basics of Data Types guide.

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