mirror of
https://github.com/TheAlgorithms/Python.git
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267b5eff40
* Added doctest and more explanation about Dijkstra execution. * tests were not passing with python2 due to missing __init__.py file at number_theory folder * Removed the dot at the beginning of the imported modules names because 'python3 -m doctest -v data_structures/hashing/*.py' and 'python3 -m doctest -v data_structures/stacks/*.py' were failing not finding hash_table.py and stack.py modules. * Moved global code to main scope and added doctest for project euler problems 1 to 14. * Added test case for negative input. * Changed N variable to do not use end of line scape because in case there is a space after it the script will break making it much more error prone. * Added problems description and doctests to the ones that were missing. Limited line length to 79 and executed python black over all scripts. * Changed the way files are loaded to support pytest call. * Added __init__.py to problems to make them modules and allow pytest execution. * Added project_euler folder to test units execution * Changed 'os.path.split(os.path.realpath(__file__))' to 'os.path.dirname()'
52 lines
1.0 KiB
Python
52 lines
1.0 KiB
Python
"""
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n! means n × (n − 1) × ... × 3 × 2 × 1
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For example, 10! = 10 × 9 × ... × 3 × 2 × 1 = 3628800,
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and the sum of the digits in the number 10! is 3 + 6 + 2 + 8 + 8 + 0 + 0 = 27.
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Find the sum of the digits in the number 100!
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"""
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def factorial(n):
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fact = 1
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for i in range(1, n + 1):
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fact *= i
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return fact
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def split_and_add(number):
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"""Split number digits and add them."""
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sum_of_digits = 0
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while number > 0:
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last_digit = number % 10
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sum_of_digits += last_digit
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number = number // 10 # Removing the last_digit from the given number
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return sum_of_digits
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def solution(n):
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"""Returns the sum of the digits in the number 100!
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>>> solution(100)
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648
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>>> solution(50)
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216
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>>> solution(10)
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27
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>>> solution(5)
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3
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>>> solution(3)
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6
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>>> solution(2)
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2
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>>> solution(1)
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1
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"""
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f = factorial(n)
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result = split_and_add(f)
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return result
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if __name__ == "__main__":
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print(solution(int(input("Enter the Number: ").strip())))
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