input: Write a function that prompts the user to enter a radius and then calculates and prints the area of the circle. The function should use an approximate value of pi as 3.14.
  def calculate_circle_area():
      Pi = 3.14
      radius = float(input("Please enter the radius of the circle: "))
      area = Pi*radius**2
      print("The area of the circle is:", area)
  
  assert calculate_circle_area()
  assert calculate_circle_area()
output: def calculate_circle_area():
      Pi = 3.14
      radius = float(input("Please enter the radius of the circle: "))
      area = Pi*radius**2
      print("The area of the circle is:", area)