add reverse_digits_of_number

Author: james5635

Logic Building/Write a program to reverse digits of a number/1.py

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+""" Reversing Digit by Digit """
+def reverse_digits(n: int) -> int:
+    """
+    >>> reverse_digits(1234)
+    4321
+    >>> reverse_digits(0)
+    0
+    >>> reverse_digits(1000)
+    1
+    >>> reverse_digits(987654321)
+    123456789
+    """
+    reversed_number = 0
+    while n > 0:
+        digit = n % 10
+        reversed_number = reversed_number * 10 + digit
+        n //= 10
+    return reversed_number
+if __name__ == "__main__":
+    from doctest import testmod
+    testmod(verbose=True)

Logic Building/Write a program to reverse digits of a number/2.py

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+""" Using rescursion """
+
+
+def reverse_digits(n: int, reversed_number: list[int], base_position: list[int]) -> int:
+    """
+    >>> reverse_number = [0] # must be [0]
+    >>> base_position = [1] # must be [1]
+    >>> reverse_digits(1234, reverse_number, base_position)
+    4321
+    >>> reverse_number = [0] # must be [0]
+    >>> base_position = [1] # must be [1]
+    >>> reverse_digits(0, reverse_number, base_position)
+    0
+    >>> reverse_number = [0] # must be [0]
+    >>> base_position = [1] # must be [1]
+    >>> reverse_digits(1000, reverse_number, base_position)
+    1
+    >>> reverse_number = [0] # must be [0]
+    >>> base_position = [1] # must be [1]
+    >>> reverse_digits(987654321, reverse_number, base_position)
+    123456789
+    """
+    if n > 0:
+        reverse_digits(n // 10, reversed_number, base_position)
+        reversed_number[0] += (n % 10) * base_position[0]
+        base_position[0] *= 10
+    return reversed_number[0]
+
+
+if __name__ == "__main__":
+    from doctest import testmod
+
+    testmod(verbose=True)

Logic Building/Write a program to reverse digits of a number/3.py

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+"""Using String"""
+
+
+def reverse_digits(n: int) -> int:
+    """
+    >>> reverse_digits(1234)
+    4321
+    >>> reverse_digits(0)
+    0
+    >>> reverse_digits(1000)
+    1
+    >>> reverse_digits(987654321)
+    123456789
+    """
+    s: str = str(n)
+    digits: list[str] = list(s)
+    digits.reverse()
+    reversed_number = int("".join(digits))
+
+    return reversed_number
+
+if __name__ == "__main__":
+    from doctest import testmod
+
+    testmod(verbose=True)

Logic Building/Write a program to reverse digits of a number/4.py

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+""" Using String and Slicing in Python """
+
+
+# for python only
+def reverse_digits_2(n: int) -> int:
+    """
+    >>> reverse_digits_2(1234)
+    4321
+    >>> reverse_digits_2(0)
+    0
+    >>> reverse_digits_2(1000)
+    1
+    >>> reverse_digits_2(987654321)
+    123456789
+    """
+    s: str = str(n)
+    s_reversed: str = s[::-1]
+    reversed_number = int(s_reversed)
+    return reversed_number
+
+if __name__ == "__main__":
+    from doctest import testmod
+
+    testmod(verbose=True)

Logic Building/Write a program to reverse digits of a number/README.md

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+## reverse_digits_of_number Method
+- Reversing Digit by Digit
+- Using rescursion 
+- Using String
+- Using String and Slicing in Python