This is more of a just for fun question. I’m working on a SC61860 CPU, which is an 8-bit CPU for a Sharp PC-1360 Pocket Computer from 1987 (also used in PC-1401 & 1403’s). Its instruction set d...

I try to implement efficient exclusive-or (XOR) in Prolog CLPFD. This should be simple predicate like: xor(A, B, AxorB). A, B, AxorB are natural numbers (with 0) and AxorB is a result of A xor B...

Is it possible to simplify (a+b)xor(c+b)? What is the contribution of b to the final result? Note that I'm mixing boolean algebra with arithmetic, xor is a bitwise exclusive or on correspondi...

I was reading about xor in php , and I saw this example: $aa = "A" ^ "}"; echo $aa; // < So I search in internet about how it works and they said its sum the ascii code , but the above code ...

I came across the below code snippet in a product's code. It is using bitwise XOR for string comparison. Is this better than the String.equals(Object o) method? What is the author trying to achieve...

I know the working of XOR, Console.WriteLine(1^1); // returns 0 results to 00000001 00000001 -------- 00000000 but how does this return 2? Console.WriteLine(-(-1^1)); // returns 2 ...

Here is the original code: public static String reverseString(String s){ if(s == null) return ""; char[] rev = s.toCharArray(); int i = 0, j = s.length() - 1; while(i < j) { rev[i] ^= re...

This is a recent interview question from Google: We define f(X, Y) as number of different corresponding bits in binary representation of X and Y. For example, f(2, 7) = 2, since binary represe...

Given XOR & SUM of two numbers. How to find the numbers? For example, x = a+b, y = a^b; if x,y are given, how to get a, b? And if can't, give the reason.

I think I understand python bytes objects, but supporting bitwise operations on byte strings seems like such an obvious feature. I don't understand why it is not supported. >>>'abcdefg'.e...

I was reading an article from other website (Computer Science - Can a Minimum Possible Efficiency be proven?) about assuming a minimum Big-O time for the worst cases. One of the answers goes to a ...

I had been studying the algorithm for finding lonely integers in an array, and here is the implementation: int arr[] = {10, 20, 30, 5, 20, 10, 30}; int LonelyInteger = 0; for(int i=0; i< 7; i++...

I have a positive integer array- {1,5,8,2,10} and a given value 7. I need to find whether a subset of the array exists such that the XOR of its elements is the value 7. In this case the subset is {...

I'm new to Xor encryption, and I'm having some trouble with the following code: function xor_this($string) { // Let's define our key here $key = ('magic_key'); // Our plaintext/ciphertext $te...

I don't fully understand this algorithm of calculating the parity bit. Can someone please explain in detail? The following code is taken from the 'Hacker's Delight' book: int parity(unsigned x) {...

Given an array where number of occurrences of each number is odd except one number whose number of occurrences is even. Find the number with even occurrences. e.g. 1, 1, 2, 3, 1, 2, 5, 3, 3 Out...

Can anyone explain this operator with a good example? I know what this operator is. I mean a real-life example.