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* Added new tests! * [ADD]: Inproved Tests * fixed * Removed spaces * Changed the file name * Added Changes * changed the code and kept the test cases * changed the code and kept the test cases * missed the line * removed spaces * Update power_using_recursion.py --------- Co-authored-by: Christian Clauss <cclauss@me.com>
56 lines
1.5 KiB
Python
56 lines
1.5 KiB
Python
"""
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== Raise base to the power of exponent using recursion ==
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Input -->
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Enter the base: 3
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Enter the exponent: 4
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Output -->
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3 to the power of 4 is 81
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Input -->
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Enter the base: 2
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Enter the exponent: 0
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Output -->
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2 to the power of 0 is 1
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"""
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def power(base: int, exponent: int) -> float:
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"""
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Calculate the power of a base raised to an exponent.
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>>> power(3, 4)
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81
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>>> power(2, 0)
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1
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>>> all(power(base, exponent) == pow(base, exponent)
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... for base in range(-10, 10) for exponent in range(10))
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True
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>>> power('a', 1)
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'a'
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>>> power('a', 2)
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Traceback (most recent call last):
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...
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TypeError: can't multiply sequence by non-int of type 'str'
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>>> power('a', 'b')
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Traceback (most recent call last):
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...
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TypeError: unsupported operand type(s) for -: 'str' and 'int'
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>>> power(2, -1)
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Traceback (most recent call last):
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...
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RecursionError: maximum recursion depth exceeded
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"""
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return base * power(base, (exponent - 1)) if exponent else 1
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if __name__ == "__main__":
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from doctests import testmod
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testmod()
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print("Raise base to the power of exponent using recursion...")
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base = int(input("Enter the base: ").strip())
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exponent = int(input("Enter the exponent: ").strip())
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result = power(base, abs(exponent))
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if exponent < 0: # power() does not properly deal w/ negative exponents
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result = 1 / result
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print(f"{base} to the power of {exponent} is {result}")
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