How to variable Swap Mastery and Reverse Digit using python
The XOR swapping technique uses the bitwise XOR operator (^) to swap the values of two variables. The XOR operator returns a 1 for each bit where the two compared bits are different, and a 0 where they are the same.
The swapping technique works by first XORing the values of a and b and storing the result in a. Then, it XORs the original value of b with the current value of a (which is the XOR of the original a and b values) and stores the result in b. Finally, it XORs the current value of a with the result of the second XOR operation and stores the result back in a.
This technique works because XOR has the following properties:
a ^ a = 0
a ^ 0 = a
(a ^ b) ^ b = a
Using these properties, the XOR swapping technique effectively swaps the values of a and b without using a third variable.
The extract_digits function takes an integer num as input and returns a list of its digits in reverse order.
Here's how it works:
The first line of the function converts the integer num to a string using the str function.
This is because it's easier to manipulate strings than integers when dealing with individual digits.
The second line uses slicing to reverse the string.
The [::-1] slice means "start at the end of the string and end at position 0, move with the step -1",
effectively reversing the string.
The third line uses a list comprehension to convert each character in the reversed string back to an integer
and store it in a list. The list comprehension [int(digit) for digit in reversed_str_num] creates a new list
where each element is the integer value of the corresponding character in the reversed string.
Finally, the function returns the list of reversed digits
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