bit-manipulation

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Question about test_bit macro in C

I\'ve used the following macro in C: #definetest_bit(_n,_p)!! ( _n & ( 1u << _p)) I\'ve studied the macro but I need to determine the use of the double negative in the macro, and how it b[详细]

2023-04-06 01:15 分类：问答
Bitwise shift to generate all possible permutations in C [duplicate]

This question already has answers here: Closed 11 years ago. Possible Duplicate: Creating multiple numbers with certain number of bits set[详细]

2023-04-06 00:28 分类：问答
Reversing a Number using bitwise shift

I am trying to find a way to reverse a number without Converting it to a string to find the length Reversing the string and parsing it back[详细]

2023-04-05 17:22 分类：问答
How can I make this bitwise code work?

bitwise operators only work on integers in PHP and the maximum size of an integer is 2^63 on 64bit servers. If I create a value greater than that it will cast my variable to a float and bitwise operat[详细]

2023-04-05 08:40 分类：问答
How to write an std::floor function from scratch [duplicate]

This question already has answers here: Write your own implementation of math's floor function, C 开发者_运维问答[详细]

2023-04-05 05:51 分类：问答
Why if (n & -n) == n then n is a power of 2?

Line 294 of java.util.Random source says if ((n & -n) == n) //开发者_StackOverflow社区 i.e., n is a power of 2[详细]

2023-04-05 02:54 分类：问答
PL/SQL Comparing bit strings, I need an AND operation?

I currently have a script that calculates the tanimoto coefficient o开发者_StackOverflow中文版n the fingerprints of a chemical library. However during testing I found my implementation could not be fe[详细]

2023-04-05 00:18 分类：问答
Is there a concise way to create bit masks in C?

I need to create开发者_StackOverflow three bit masks that end up in three 32-bit unsigned ints (let\'s call them x, y and z). The masks should end up like this:[详细]

2023-04-04 09:54 分类：问答
De Bruijn-like sequence for `2^n - 1`: how is it constructed?

I\'m looking at the entry Find the log base 2 of an N-bit integer in O(lg(N)) operations with multiply and lookup from Bit Twiddling hacks.[详细]

2023-04-04 08:26 分类：问答
Ruby unsigned right shift operator

I\'m attempting to convert so开发者_如何学JAVAme of my Java code to (J)Ruby, and due to my lack of experience of bitwise operations, I ran into a problem that I can\'t seem to be able to solve by myse[详细]

2023-04-04 06:34 分类：问答