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* codespell --quiet-level=2 Suppress the BINARY FILE warnings * fixup! Format Python code with psf/black push
58 lines
1.4 KiB
Python
58 lines
1.4 KiB
Python
"""
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An Armstrong number is equal to the sum of the cubes of its digits.
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For example, 370 is an Armstrong number because 3*3*3 + 7*7*7 + 0*0*0 = 370.
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An Armstrong number is often called Narcissistic number.
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"""
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def armstrong_number(n: int) -> bool:
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"""
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Return True if n is an Armstrong number or False if it is not.
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>>> armstrong_number(153)
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True
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>>> armstrong_number(200)
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False
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>>> armstrong_number(1634)
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True
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>>> armstrong_number(0)
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False
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>>> armstrong_number(-1)
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False
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>>> armstrong_number(1.2)
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False
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"""
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if not isinstance(n, int) or n < 1:
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return False
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# Initialization of sum and number of digits.
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sum = 0
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number_of_digits = 0
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temp = n
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# Calculation of digits of the number
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while temp > 0:
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number_of_digits += 1
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temp //= 10
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# Dividing number into separate digits and find Armstrong number
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temp = n
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while temp > 0:
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rem = temp % 10
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sum += rem ** number_of_digits
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temp //= 10
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return n == sum
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def main():
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"""
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Request that user input an integer and tell them if it is Armstrong number.
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"""
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num = int(input("Enter an integer to see if it is an Armstrong number: ").strip())
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print(f"{num} is {'' if armstrong_number(num) else 'not '}an Armstrong number.")
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if __name__ == "__main__":
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import doctest
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doctest.testmod()
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main()
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