Session 4 - Understanding Variables in Programming! #learntocode #shorts #youtubeshorts #stem

🎬 Session 4: Understanding Variables in Programming! 💡🔢
In this lesson, we explore Variables – the foundation of how programs store and manage data! 🖥️📦
✅ What is a Variable?
A variable is a storage location in a program that holds a value, which can change as the program runs. Think of it as a named container for storing information.
✅ Why are Variables Important?
🔹 Store and manipulate data efficiently 📊
🔹 Allow programs to be dynamic and interactive 🎯
🔹 Reduce repetition and make code flexible 🔄
✅ Understanding Variable Types:
Different types of data require different kinds of variables. Common types include:
🔹 Integers (int) – Whole numbers (e.g., 10, -3, 42)
🔹 Floating-point (float) – Decimal numbers (e.g., 3.14, -0.99, 2.5)
🔹 Strings (str) – Text (e.g., "Hello", "Python")
🔹 Boolean (bool) – True or False values
📌 Example:
python
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age = 25 # Integer
price = 9.99 # Float
name = "Raj" # String
is_student = True # Boolean

💡 The type of a variable defines how the program stores and processes it!
✅ Scope of Variables:
🔹 Local Variables: Exist only within a specific function or block.
🔹 Global Variables: Exist throughout the entire program.
📌 Example:
python
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def my_function():
local_var = "I'm local!" # Can be used only inside this function

global_var = "I'm global!" # Can be used anywhere in the program

💡 Using the right scope helps prevent errors and keeps code organized!
✅ Constants: Values That Don’t Change
A constant is a special type of variable whose value remains fixed throughout the program. In many languages, we use uppercase names to indicate a constant.
📌 Example:
python
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PI = 3.14159 # Constant value
MAX_USERS = 100 # Fixed limit

💡 Constants improve code readability and prevent accidental changes!
✅ Real-Life Examples of Variables:
📌 Storing user names, scores, or input data in an app.
📌 Keeping track of a shopping cart total.
📌 Managing game progress (e.g., health, level, points).
💡 Mastering variables is the first step to writing powerful, efficient programs!
💬 Got questions? Drop them in the chat!
📩 Want more details? DM us anytime!
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