└── fly


/fly:
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 1 | import math
 2 | 
 3 | def calculate_surface_area(radius):
 4 |     """
 5 |     Calculate the surface area of a planet given its radius.
 6 |     
 7 |     Parameters:
 8 |     radius (float): The radius of the planet in kilometers.
 9 | 
10 |     Returns:
11 |     float: The surface area of the planet in square kilometers.
12 |     """
13 |     return 4 * math.pi * (radius ** 2)
14 | 
15 | def main():
16 |     print("Planet Surface Area Calculator")
17 |     planets = []
18 |     
19 |     while True:
20 |         try:
21 |             # Get user input for the planet's name and radius
22 |             planet_name = input("Enter the name of the planet (or type 'done' to finish): ")
23 |             if planet_name.lower() == 'done':
24 |                 break
25 |             
26 |             radius = float(input(f"Enter the radius of {planet_name} in kilometers: "))
27 |             
28 |             if radius <= 0:
29 |                 raise ValueError("The radius must be a positive number.")
30 |             
31 |             # Calculate the surface area
32 |             surface_area = calculate_surface_area(radius)
33 |             
34 |             # Store the result
35 |             planets.append((planet_name, radius, surface_area))
36 |         
37 |         except ValueError as ve:
38 |             print(f"Error: {ve}")
39 |     
40 |     # Output the results for all planets
41 |     print("\nSurface Areas of Planets:")
42 |     for planet in planets:
43 |         print(f"The surface area of {planet[0]} with radius {planet[1]} km is {planet[2]:.2f} square kilometers.")
44 | 
45 | if name == "__main__":
46 |     main()
47 | 


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