Recent questions tagged bit

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I've got a really big number: 5799218898. And want to shift it right to 13 bits. So, windows-calculator ... but cannot find anything about that. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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bit manipulation - Unsigned Integer in Javascript

I'm working on a page that processes IP address information, but it's choking on the fact that integers are signed. ... /script> </body> </html> See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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bit manipulation - How Does The Bitwise & (AND) Work In Java?

I was reading through some code examples and came across a & on Oracle's website on their Bitwise ... /javase/tutorial/java/nutsandbolts/examples/BitDemo.java Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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bit manipulation - Java: right shift on negative number

I am very confused on right shift operation on negative number, here is the code. int n = -15; System.out.println ... number by 31 not 1 (the sign bit)? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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bit manipulation - Implement division with bit-wise operator

How can I implement division using bit-wise operators (not just division by powers of 2)? Describe it in detail. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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bit fields - Does Python have a bitfield type?

I need a compact representation of an array of booleans, does Python have a builtin bitfield type or will I need to find an alternate solution? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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bit manipulation - Two's Complement in Python

Is there a built in function in python which will convert a binary string, for example '111111111111', to the two's complement integer -1? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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988 views

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bit shift - What does the C standard say about bitshifting more bits than the width of type?

Consider the following code: int i = 3 << 65; I would expect that the result is i==0, however the ... width of type int) or is this unspecified behavior? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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bit shift - Right shifting negative numbers in C

I have C code in which I do the following. int nPosVal = +0xFFFF; // + Added for ease of understanding ... rounded off to -32768. Is this understanding correct? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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bit manipulation - POSIX subtract bytes of file B from file A

Assuming I have two binary files A and B, how can I subtract the bytes of file B from the bytes of file A ... .com/questions/65928160/posix-subtract-bytes-of-file-b-from-file-a...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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941 views

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bit manipulation - Generating Moves from Bitboard

Example: Noughts and Crosses Say I have a bitboard for all occupied squares and using a mask I ... https://stackoverflow.com/questions/65645547/generating-moves-from-bitboard...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.0k views

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bit manipulation - How Does The Bitwise & (AND) Work In Java?

I was reading through some code examples and came across a & on Oracle's website on their Bitwise and Bit Shift ... .com/questions/17256644/how-does-the-bitwise-and-work-in-java...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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848 views

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bit manipulation - How Does The Bitwise & (AND) Work In Java?

I was reading through some code examples and came across a & on Oracle's website on their Bitwise and Bit Shift ... .com/questions/17256644/how-does-the-bitwise-and-work-in-java...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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988 views

1 answer

bit manipulation - Is there a way to perform a circular bit shift in C#?

I know that the following is true int i = 17; //binary 10001 int j = i << 1; //decimal 34, binary 100010 But ... questions/35167/is-there-a-way-to-perform-a-circular-bit-shift-in-c...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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878 views

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bit manipulation - Why by using n&(n-1) is not able to calculate number of 1's bits?

I found a video on youtube that says by using n&(n-1) we can able to count number of 1's bits and it's much faster ... /why-by-using-nn-1-is-not-able-to-calculate-number-of-1s-bits...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.1k views

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bit manipulation - How to generate a fixed-length code from a set of integers of a specific bit count in JavaScript

Generate string from integer with arbitrary base in JavaScript received the following answer: function parseInt( ... .log(toString(0, 'abcdefghijklmnopqrstuvwxyz0123456789+-'));...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.0k views

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bit manipulation - PHP Bitwise NOT

I need to pack a number in 1byte (char), 2 bytes (short), 4 bytes (int) ... Online sandbox: https://sandbox.onlinephpfunctions.com/code/35bf7ffd4e50096c5cfe52901003ffe3b0e97d2d...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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2.6k views

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bit manipulation - Why is the sum of bitwise AND and bitwise XOR equal to bitwise OR?

Is there a reason why this happens? #include <stdio.h> void main() { int i, j; //Takes i as 0 with short printf("Enter two ... ^ j)) printf(" YES "); else printf(" NO "); }...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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2.8k views

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bit manipulation - Why is the sum of bitwise AND and bitwise XOR equal to bitwise OR?

Is there a reason why this happens? #include <stdio.h> void main() { int i, j; //Takes i as 0 with short printf("Enter two ... ^ j)) printf(" YES "); else printf(" NO "); }...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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3.3k views

1 answer

bit manipulation - Python - Fastest way to calculate log2(int) of a number that is an integral power of 2

I'm using bitsets and want to iterate over the set bits quickly, and without needing to know the max set bit ahead of time. Using this ... bits(109): print(int(log2(b))) 0 2 3 5 6...

asked Jan 25, 2021 in Technique[技术] by 深蓝 (71.8m points)

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