Boolean

A Boolean value is either true or false.
A Boolean expression produces a Boolean value (true or false) when evaluated.

Conditional ("if") statements

Affect the sequential flow of control by executing different statements based on the value of a Boolean expression.

IF (condition)
{
	<block of statements>
}

The code in <block of statements> is executed if the Boolean expression condition evaluates to true; no action is taken if condition evaluates to false.

IF (condition)
{
	<block of statements>
}
ELSE
{
	<second block of statements>
}

The code in the first <block of statements> is executed if the Boolean expression condition evaluates to true; otherwise, the code in <second block of statements> is executed.

Example: Calculate the sum of 2 numbers. If the sum is greater than 10, display 10; otherwise, display the sum.

num1 = INPUT
num2 = INPUT
sum = num1 + num2
IF (sum > 10)
{
	DISPLAY (10)
}
ELSE
{
	DISPLAY (sum)
}

Hack 1

Add a variable that represents an age.
Add an ‘if’ and ‘print’ function that says “You are an adult” if your age is greater than or equal to 18.
Make a function that prints “You are a minor” with the else function.

## YOUR CODE HERE
age = int(input("Enter your age:"))
if age >= 18:
    print("You are an adult.")
elif age > 0 and age < 18:
    print("You are a minor.")
else:
    print("Invalid age entered.")

Enter your age:15
You are a minor.

Relational operators:

Used to test the relationship between 2 variables, expressions, or values. These relational operators are used for comparisons and they evaluate to a Boolean value (true or false).

Ex. a == b evaluates to true if a and b are equal, otherwise evaluates to false

a == b (equals)
a != b (not equal to)
a > b (greater than)
a < b (less than)
a >= b (greater than or equal to)
a <= b (less than or equal to)

Example: The legal age to work in California is 14 years old. How would we write a Boolean expression to check if someone is at least 14 years old?

age >= 14

Example: Write a Boolean expression to check if the average of height1, height2, and height3 is at least 65 inches.

(height1 + height2 + height3) / 3 >= 65

Hack 2

Make a variable called ‘is_raining’ and set it to ‘True”.
Make an if statement that prints “Bring an umbrella!” if it is true
Make an else statement that says “The weather is clear”.

## YOUR CODE HERE
is_raining = False
if is_raining:
    print("Bring an unbrella!")
else:
    print("The weather is clear.")

The weather is clear.

Logical operators:

Used to evaluate multiple conditions to produce a single Boolean value.

NOT evaluates to true if condition is false, otherwise evaluates to false
AND evaluates to true if both conditions are true, otherwise evaluates to false
OR evaluates to true if either condition is true or if both conditions are true, otherwise evaluates to false

Example: You win the game if you score at least 10 points and have 5 lives left or if you score at least 50 points and have more than 0 lives left. Write the Boolean expression for this scenario.

(score >= 10 AND lives == 5) OR (score == 50 AND lives > 0)

Relational and logical operators:

Example: These expressions are all different but will produce the same result.

age >= 16
age > 16 OR age == 16
NOT age < 16

Hack 3

Make a function to randomize numbers between 0 and 100 to be assigned to variables a and b using random.randint
Print the values of the variables
Print the relationship of the variables; a is more than, same as, or less than b

## YOUR CODE HERE
import random
a = random.randint(0,100)
b = random.randint(0,100)
print(f"The value of a is : {a}")
print(f"The value of b is : {b}")
if a > b:
    print(f"{a} is greater than {b}.")
elif a < b:
    print(f"{a} is less than {b}.")
else:
    print(f"{a} is the same as {b}.")

The value of a is : 43
The value of b is : 88
43 is less than 88.

Homework

Criteria for above 90%:

Add more questions relating to Boolean rather than only one per topic (ideas: expand on conditional statements, relational/logical operators)
Add a way to organize the user scores (possibly some kind of leaderboard, keep track of high score vs. current score, etc. Get creative!)
Remember to test your code to make sure it functions correctly.

#HOMEWORK


# The quiz contains questions related to Boolean values, Boolean expressions,
# conditional statements, relational operators, and logical operators.

# Import necessary modules
import getpass  # Module to get the user's name
import sys  # Module to access system-related information

# Function to ask a question and get a response
def question_with_response(prompt):
    # Print the question
    print("Question: " + prompt)
    # Get user input as the response
    msg = input()
    return msg

# Define the number of questions and initialize the correct answers counter
questions = 5
correct = 0

# Personalized greeting message
# Collect the student's name
user_name = input("Enter your name: ")
print('Hello, ' + user_name + " running " + sys.executable)
print("You will be asked " + str(questions) + " questions.")
readyornot = input("Are you ready to take a test? ")

if readyornot == "Yes" or readyornot == "yes":
    print("Alright, let's get started!")

# Question 1: Boolean Basics 
# Ask a question about Boolean values and check the response
# Provide feedback based on the correctness of the response
    answer1 = question_with_response("Question 1. Is 'True' a valid boolean value? ")
    if answer1 == "Yes" or answer1 == "yes":
        print(f"{answer1} is correct!")
        correct += 1
    else:
        print(f"{answer1} is incorrect! The correct answer is 'yes'.")
    
# Question 2: Boolean Expressions
# Ask a question about Boolean expressions and their importance in programming
# Provide feedback based on the correctness of the response

    answer2 = question_with_response("Question 2. Let word = 'monkey' and I want to check if the letter q exists. What will be the output? ")
    if answer2 == "False" or answer2 == "false":
        print(f"{answer2} is correct!")
        correct += 1
    else:
        print(f"{answer2} is incorrect! The correct answer is 'False'.")
        
# Question 3: Conditional Statements
# Ask a question about the purpose of conditional (if-else) statements in programming
# Provide feedback based on the correctness of the response

    answer3 = question_with_response("Question 3. Which statement is executed when a condition fails? ")
    if answer3 == "else" or answer3 == "Else":
        print(f"{answer3} is correct!")
        correct += 1
    else:
        print(f"{answer3} is incorrect! The correct answer is 'else'.")
    
# Question 4: Relational Operators
# Ask a question about common relational operators in programming and provide examples
# Provide feedback based on the correctness of the response
    answer4 = question_with_response("Question 4. What relational operator is used to check if a number is greater than or equal to another number?")
    if answer4 == "<=":
        print(f"{answer4} is correct!")
        correct += 1
    else:
        print(f"{answer4} is incorrect! The correct answer is '<='.")
# Question 5: Logical Operators
# Ask a question about the use of logical operators in programming and provide examples
# Provide feedback based on the correctness of the response
    answer5 = question_with_response("Question 5. What logical operator is used to check if either condition is true? ")
    if answer5 == "Or" or answer5 == "or":
        print(f"{answer5} is correct!")
        correct += 1
    else:
        print(f"{answer5} is incorrect! The correct answer is 'or'.")

else:
    print("Bye, see you another time!")

# Display the final score
# Calculate the percentage of correct answers and provide feedback
score = (correct/questions)*100
print(user_name + ", you scored " + str(correct) + "/" + str(questions) + " which is a " + "{:.2f}".format(score) + "%.")

Enter your name: aditya
Hello, aditya running /usr/bin/python3
You will be asked 5 questions.
Are you ready to take a test? yes
Alright, let's get started!
Question: Question 1. Is 'True' a valid boolean value? 
yes
yes is correct!
Question: Question 2. Let word = 'monkey' and I want to check if the letter q exists. What will be the output? 
false
false is correct!
Question: Question 3. Which statement is executed when a condition fails? 
else
else is correct!
Question: Question 4. What relational operator is used to check if a number is greater than or equal to another number?
<=
<= is correct!
Question: Question 5. What logical operator is used to check if either condition is true? 
or
or is correct!
aditya, you scored 5/5 which is a 100.00%.

Boolean, If Lesson • 23 min read

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