input: Write a function to prompt the user to enter the value of radius and then calculate the area of a circle using the given radius. If the input is invalid, the function should raise an exception.
  def calculate_circle_area():
      Pi = 3.14
      try:
          radius = float(input("Please enter the radius of the circle: "))
          if radius < 0:
              raise ValueError("Radius cannot be negative.")
          area = Pi * radius ** 2
          print("The area of the circle is:", area)
      except ValueError as e:
          print("Invalid input:", e)
  assert calculate_circle_area()=="Please enter the radius of the circle: 5\nThe area of the circle is: 78.5"
  assert calculate_circle_area()=="Please enter the radius of the circle: 10\nThe area of the circle is: 314.0"
  assert calculate_circle_area()=="Please enter the radius of the circle: -5\nInvalid input: Radius cannot be negative."
  assert calculate_circle_area()=="Please enter the radius of the circle: abc\nInvalid input: could not convert string to float: 'abc'"
output: def calculate_circle_area():
      Pi = 3.14
      try:
          radius = float(input("Please enter the radius of the circle: "))
          if radius < 0:
              raise ValueError("Radius cannot be negative.")
          area = Pi * radius ** 2
          print("The area of the circle is:", area)
      except ValueError as e:
          print("Invalid input:", e)