input: 
  def calculate_circle_area() -> None:
      """
      Prompts the user to enter the value of the radius and calculates the area of a circle.
      >>> import io
      >>> import sys
      >>> sys.stdin = io.StringIO('5.0')
      >>> calculate_circle_area()
      The area of the circle is: 78.5
      >>> sys.stdin = io.StringIO('3.0')
      >>> calculate_circle_area()
      The area of the circle is: 28.26
      """
      # Step 1: Define a constant for Pi
      Pi = 3.14
  
      # Step 2: Get the radius from the user
      radius = float(input("Please enter the radius of the circle: "))
  
      # Step 3: Calculate the area
      area = Pi * radius ** 2
  
      # Step 4: Print the area
      print("The area of the circle is:", area)
  
output:     # Step 1: Define a constant for Pi
      Pi = 3.14
  
      # Step 2: Get the radius from the user
      radius = float(input("Please enter the radius of the circle: "))
  
      # Step 3: Calculate the area
      area = Pi * radius ** 2
  
      # Step 4: Print the area
      print("The area of the circle is:", area)