"""
Topic 07: Object Oriented Programming (OOP) - EASY Exercises (10)
"""
# Exercise 1: Create a class named 'Book' with attributes 'title' and 'author' in the __init__ method.
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# Exercise 2: Instantiate an object of the 'Book' class and print its title.
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# Exercise 3: Add a method 'describe' to the 'Book' class that returns "Title by Author".
# Write your code below:
# Exercise 4: Create a class 'Circle' with an attribute 'radius'.
# Add a method 'calculate_area' that returns the area.
# Write your code below:
# Exercise 5: Create a class 'Student' with attributes 'name' and 'roll_number'.
# Print the roll number of a student object.
# Write your code below:
# Exercise 6: In the 'Student' class, add a class-level attribute 'school_name' = "Global High".
# Write your code below:
# Exercise 7: Create a class 'Calculator' with methods 'add' and 'subtract' that take two numbers.
# Write your code below:
# Exercise 8: Create a class 'Car' with attributes 'make', 'model', and 'year'.
# Instantiate two different cars.
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# Exercise 9: Add a method 'start_engine' to the 'Car' class that prints "The [model] engine is starting...".
# Write your code below:
# Exercise 10: Create a class 'Rectangle' with 'length' and 'width'.
# Add a method 'is_square' that returns True if length == width.
# Write your code below: