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Computer Science & Software Engineering

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Week 5 Booleans

Booleans

2 min read

🧠 Boolean Definition + Example

Boolean Logic

🌟 What is a Boolean?

A Boolean is a data type that can only have two possible values:

  • True
  • False

These values are used to answer questions like:

  • “Is this condition met?”
  • “Has this event occurred?”

💡 Why are Booleans Important?

Booleans allow programs to make decisions! For example, you can use Booleans to check:

  • If a user is logged in
  • If a number is positive
  • If a file exists

🐍 Boolean Examples in Python

Let’s look at some simple examples and explain each line:

# Example 1: Simple Boolean assignment
is_sunny = True

Explanation:

  • is_sunny is a variable that stores a Boolean value. Here, it is set to True, meaning it is sunny.
# Example 2: Boolean from a comparison
is_adult = 18 >= 18

Explanation:

  • 18 >= 18 checks if 18 is greater than or equal to 18. This is True.
  • is_adult will be assigned the value True.
# Example 3: Using Booleans in an if statement
age = 16
if age >= 18:
    print("You are an adult.")
else:
    print("You are not an adult.")

Explanation:

  • age is set to 16.
  • if age >= 18: checks if age is at least 18. This is False.
  • Since the condition is False, the code in the else block runs, printing “You are not an adult.”
# Example 4: Boolean operators
is_raining = False
is_cold = True
if is_raining or is_cold:
    print("Bring a jacket!")

Explanation:

  • is_raining is False, is_cold is True.
  • or checks if at least one condition is True. Since is_cold is True, the message “Bring a jacket!” is printed.

🎯 Summary

  • Booleans are True or False values.
  • They are used for decision making in code.
  • You can create Booleans directly, from comparisons, or by combining conditions with operators like and, or, and not.

Booleans are everywhere in programming, and understanding them is key to writing effective code!

🔑 Essential Boolean Concepts

Master these fundamentals to ace your quiz!

🔢

What is a Boolean?

A boolean is a data type with only two possible values:

✅ True
❌ False
🎯

Why Use Booleans?

Booleans help programs make smart decisions based on conditions.

Common Uses:
  • ✅ Check if number is positive
  • 📁 Verify if file exists
  • 🔀 Control program flow

💫 Types of Boolean Operations

📍 Direct Assignment

is_sunny = True

🔍 Comparisons

is_adult = age >= 18

⚡ Boolean Operators

The three powerful logical operators!

🤝

AND

True only if both are True

True AND True = True
True AND False = False
🔗

OR

True if at least one is True

True OR False = True
False OR False = False
🔄

NOT

Flips True to False and vice versa

NOT True = False
NOT False = True
## 🎊 Ready to Test Your Knowledge?

🎯 You've reviewed the concepts - now show what you've learned!

Good luck! 🍀 You've got this! 💪

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