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Using the XOR swap algorithm to exchange nibbles between variables without the use of temporary storage. In computer programming, the exclusive or swap (sometimes shortened to XOR swap) is an algorithm that uses the exclusive or bitwise operation to swap the values of two variables without using the temporary variable which is normally required.
The simplest and probably most widely used method to swap two variables is to use a third temporary variable: define swap (x, y) temp := x x := y y := temp While this is conceptually simple and in many cases the only convenient way to swap two variables, it uses extra memory.
Re the example here, XOR is not the only way to swap two numbers, but it is just quite an easy one to understand since it only uses one operation. If the numbers to be swapped are in registers A,B and have initial values a,b the following also works: A <- A - B (A contains a-b) B <- B + A (B contains a) A <- B - A (A contains (a - (a-b) = b)
Bubble sort, sometimes referred to as sinking sort, is a simple sorting algorithm that repeatedly steps through the input list element by element, comparing the current element with the one after it, swapping their values if needed.
Is a generalisation of normal compare-and-swap. It can be used to atomically swap an arbitrary number of arbitrarily located memory locations. Usually, multi-word compare-and-swap is implemented in software using normal double-wide compare-and-swap operations. [16] The drawback of this approach is a lack of scalability. Persistent compare-and-swap
Another student told SCI he believed the alias was “Harvey Dent,” a Batman villain whose alter ego was “Two-Face.” Biski resigned from his post at Jamaica Gateway to the Sciences High ...
A former sheriff's deputy who gunned down Sonya Massey in her kitchen after she called 911 about a possible prowler outside her home will be released soon with conditions, an Illinois court ruled ...
A map of the 24 permutations and the 23 swaps used in Heap's algorithm permuting the four letters A (amber), B (blue), C (cyan) and D (dark red) Wheel diagram of all permutations of length = generated by Heap's algorithm, where each permutation is color-coded (1=blue, 2=green, 3=yellow, 4=red).