Variables and Data Types

Variables are containers for storing data values. Understanding different data types is crucial for programming.

Common Data Types

1. Numbers
   • Integers (whole numbers)
   • Floating-point (decimal numbers)
2. Text
   • Strings (text data)
   • Characters (single letters/symbols)
3. Boolean
   • True/False values
4. Collections
   • Arrays
   • Lists
   • Sets

Declaring Variables

Different programming languages have different ways of declaring variables. Here are some examples:

# Python
name = "John"
age = 25
height = 1.75
is_student = True

// JavaScript
let name = "John";
const age = 25;
var height = 1.75;
let isStudent = true;

Best Practices

• Use meaningful variable names
• Follow naming conventions
• Initialize variables properly
• Choose appropriate data types
• Consider scope and lifetime