input: Write a function that calculates and prints the area of a circle after prompting the user to enter the value of the radius. The function should return None.
  assert calculate_circle_area(3.0) == None
  assert calculate_circle_area(1.5) == None
  assert calculate_circle_area(0.0) == None
output: def calculate_circle_area(radius):
      area = 3.14159 * radius * radius
      print(area)