6. Incorporating Advanced Functions

# ... previous code ... print("Options:")print("Enter 'add' for addition")print("Enter 'subtract' for subtraction")print("Enter 'multiply' for multiplication")print("Enter 'divide' for division")print("Enter 'power' for raising to a power")print("Enter 'square_root' for square root")print("Enter 'factorial' for factorial")print("Enter 'quit' to end the program") # ... previous code ...     if user_input == 'power':        x = float(input("Enter the base number: "))        y = float(input("Enter the power: "))        print(f"{x} raised to the power of {y} is {power(x, y)}")     elif user_input == 'square_root':        x = float(input("Enter the number: "))        print(f"The square root of {x} is {square_root(x)}")     elif user_input == 'factorial':        x = int(input("Enter the number: "))        if x < 0:            print("Factorial is not defined for negative numbers!")        else:            print(f"The factorial of {x} is {factorial(x)}")     # ... rest of the code ...