mirror of
https://github.com/TheAlgorithms/Python.git
synced 2024-11-23 21:11:08 +00:00
788e4ede9b
* Added doctests to power_using_recursion.py * Added doctest to power_using_recursion.py * Update power_using_recursion.py * Update power_using_recursion.py --------- Co-authored-by: Christian Clauss <cclauss@me.com>
54 lines
1.5 KiB
Python
54 lines
1.5 KiB
Python
"""
|
|
== Raise base to the power of exponent using recursion ==
|
|
Input -->
|
|
Enter the base: 3
|
|
Enter the exponent: 4
|
|
Output -->
|
|
3 to the power of 4 is 81
|
|
Input -->
|
|
Enter the base: 2
|
|
Enter the exponent: 0
|
|
Output -->
|
|
2 to the power of 0 is 1
|
|
"""
|
|
|
|
|
|
def power(base: int, exponent: int) -> float:
|
|
"""
|
|
>>> power(3, 4)
|
|
81
|
|
>>> power(2, 0)
|
|
1
|
|
>>> all(power(base, exponent) == pow(base, exponent)
|
|
... for base in range(-10, 10) for exponent in range(10))
|
|
True
|
|
>>> power('a', 1)
|
|
'a'
|
|
>>> power('a', 2)
|
|
Traceback (most recent call last):
|
|
...
|
|
TypeError: can't multiply sequence by non-int of type 'str'
|
|
>>> power('a', 'b')
|
|
Traceback (most recent call last):
|
|
...
|
|
TypeError: unsupported operand type(s) for -: 'str' and 'int'
|
|
>>> power(2, -1)
|
|
Traceback (most recent call last):
|
|
...
|
|
RecursionError: maximum recursion depth exceeded
|
|
"""
|
|
return base * power(base, (exponent - 1)) if exponent else 1
|
|
|
|
|
|
if __name__ == "__main__":
|
|
from doctests import testmod
|
|
|
|
testmod()
|
|
print("Raise base to the power of exponent using recursion...")
|
|
base = int(input("Enter the base: ").strip())
|
|
exponent = int(input("Enter the exponent: ").strip())
|
|
result = power(base, abs(exponent))
|
|
if exponent < 0: # power() does not properly deal w/ negative exponents
|
|
result = 1 / result
|
|
print(f"{base} to the power of {exponent} is {result}")
|