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22 lines
510 B
Python
22 lines
510 B
Python
def factorial(input_number: int) -> int:
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"""
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Non-recursive algorithm of finding factorial of the
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input number.
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>>> factorial(1)
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1
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>>> factorial(6)
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720
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>>> factorial(0)
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1
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"""
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if input_number < 0:
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raise ValueError('Input input_number should be non-negative')
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elif input_number == 0:
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return 1
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else:
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result = 1
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for i in range(input_number):
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result = result * (i + 1)
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return result
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