Mastering the Basics: How Python Functions Work (with Code)

# This program demonstrates how to define and call a function in Python, including passing arguments and returning a value.
def calculate_rectangle_area(width, height):  # Defines a function named 'calculate_rectangle_area' that accepts two parameters.
    area = width * height  # Multiplies width by height and stores the result in 'area'.
    return area  # Sends the calculated area value back to the caller.

# Main program execution starts here
room_width = 12  # Assigns the integer value 12 to 'room_width'.
room_height = 15  # Assigns the integer value 15 to 'room_height'.

# Calls the function and stores the returned result in 'total_area'.
total_area = calculate_rectangle_area(room_width, room_height)

print("The area of the room is:", total_area)  # Prints the final message and result to the console.