input: Write a function that prompts the user to enter the value of radius to calculate the area of a circle. The function should return the calculated area.
  def calculate_circle_area():
      Pi = 3.14
      radius = float(input("Please enter the radius of the circle: "))
      area = Pi*radius**2
      return area
  
  assert calculate_circle_area() == 50.24  # Assuming user inputs 4 as radius
  assert calculate_circle_area() == 153.86  # Assuming user inputs 7 as radius
  assert calculate_circle_area() == 1808.64  # Assuming user inputs 24 as radius
  assert calculate_circle_area() == 0.785  # Assuming user inputs 0.5 as radius
  assert calculate_circle_area() == 0.0  # Assuming user inputs 0 as radius
output: def calculate_circle_area():
      Pi = 3.14
      radius = float(input("Please enter the radius of the circle: "))
      area = Pi*radius**2
      return area