Searched for a few hours on the web for this one, but only found the following. First, JavaScript has Math.clz32(x), so you can Count Leading Zeroes on the 32-b
For some reason in C++, the expressions if(!(n & 1)) and if(n & 1 == 0) seem to not be equivalent. Can someone please explain why this happens?
I need to use Oracle bitwise operation in my project. I know there is the BITAND() available for the purpose. As far as I know BITAND() is the only such opera
How to rotate right and left over an arbitrary number of bits. So say I am looking at 5 bits. How do I rotate around 5 bits, though I am in JavaScript. Or 8 bit
Calculating of integer logarithm base 2 is pretty easy in near any computer language - you just find the largest '1' in binary representation, and rest becomes
Suppose I have N items and a binary number that represents inclusion of these items in a result: N = 4 # items 1 and 3 will be included in the result vector =
I noticed that std::bitset does not have a function for returning or popping the lowest set bit of a bitset (nor the highest set bit for that matter). What is t
I'm looking over the solution to adding 2 binary numbers, using the bit manipulation approach. The input are 2 binary-number strings, and the expected output is
bool check(const char *text) { char c; while (c = *text++) { if ((c & 0x80) && ((*text) & 0x80)) { return true;
I have uint64_t variable with some value (for example 0x700a06fffff48517). I want to get char with the first bit of each byte in the uint (so from 0x700a06fffff
This is a problem from competitive programmer's handbook: We are given the prices of k products over n days, and we want to buy each product exactly once. Howev
Is there a quick bit operation to implement msb_equal: a function to check if two numbers have the same most significant bit? For example, 0b000100 and 0b0001
I need to switch the first half and the second half of a byte: Make 0011 0101 to 0101 0011 for example I thought it might work this way: For example, i have 10
I was studying the x86_64 assembly for the following function: /// Returns the greatest power of two less than or equal to `self`, or 0 otherwise. pub const fn
I need to encode a 24 bit integer into the end of 32 bit int. (the first byte contains other data, the other three are empty for use by the 24 bit int) I alr
Background For a long time, gcc has been providing a number of builtin bit-twiddling functions, in particular the number of trailing and leading 0-bits (also f
When bitwise & operation is greater or equal to bitwise ^ operation? For example, 4&7 >= 4^7 is true. How do we know when it will be true? The one wa
Maybe you can help me with the following problem that can help me speed a memory manager I am thinking of (I am not sure a solution exists – I did not fin
I recently came across this question on Leetcode and figured out a solution that I need some clarification with: Given an array of integers, every element a
I am reading K&R book for c language and in section 2.10 they give the following example: /*bitcount: count 1 bits in x*/ int bitcount(unsigned x) { in