Recent questions tagged bit

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bit shift - Bit shifting an int 32 times in C

I have a specific C bit-shifting scenario that I do not believe is covered on Stack Overflow yet. (If it is ... far from the entire question.) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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bit manipulation - How are 32 bit JavaScript numbers resulting from a bit-wise operation converted back to 64 bit numbers

I am trying to understand how bit-wise operation in JavaScript work, more specifically how the 32 bit number ... converting between the two. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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bit manipulation - How can I perform arithmetic right shift in C in a portable way?

We are writing an emulator where we need sign propagating right shift. The emulated system uses 2's complement ... word length is not defined. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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bit manipulation - return index of least significant bit in Python

C++ has a set of functions, ffs(), ffsl(), and ffsll(), that return the least significant bit that ... know of something comparable in Python. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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bit shift - Bits in C, how do I access the underlying bits in a C float?

Given a two floating point Numbers A and B, which are command line arguments, I must create methods to do bitwise ... 0's. Any idea how? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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bit shift - Bitshift operators description in Java language specification

At specified in JLS8 at §JLS-15.19 If the promoted type of the left-hand operand is int, then only the ... . An example is much appreciated. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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bit fields - C++ 2-bit bitfield arrays possible?

I have a struct of 2-bit bitfields like this: struct MyStruct { unsigned __int32 info0 : 2; unsigned __int32 ... address them as an array? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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bit manipulation - What does "|=" mean in Java?

Note my question is not regarding != but |= A usage example is here I assume that x |= y is the ... documentation and wanted to be sure Thanks See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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bit manipulation - C - Swap a bit between two numbers

I just tried with this code: void swapBit(unsigned char* numbA, unsigned char* numbB, short bitPosition)// ... it :) Thanks in advance See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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bit manipulation - What does the pipe operator do in SQL?

I am redeveloping an application and have found this sql statement, what does the | character do in this part (au ... | 8) = au.ExNetBits See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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bit manipulation - javascript bitwise operator question

In Javascript when I do this var num = 1; ~ num == -2 why does ~num not equal 0 in binary 1 is ... something... can someone clear this up See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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bit shift - Shifted by negative number in java

I have problem with shift operator in Java.I have used following code and not unable to understand how this program ... Output: value of i=4 See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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bit manipulation - How do you reverse the significant bits of an integer in python?

What is the best way to reverse the significant bits of an integer in python and then get the resulting integer ... solution to a logic puzzle. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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bit manipulation - In Java, when using bitshifts, why does 1 << 32 != 1 << 31 << 1?

int a = 1 << 32; int b = 1 << 31 << 1; Why does a == 1? b is 0 as I expected. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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bit manipulation - bitwise & doesn't work with bytes in kotlin

I'm trying to write kotlin code like: for (byte b : hash) stringBuilder.append(String.format("%02x", b&0xff)); but ... 's ok to use 1 and 0xff See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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547 views

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bit shift - Bit shifting an int 32 times in C

I have a specific C bit-shifting scenario that I do not believe is covered on Stack Overflow yet. (If it is ... far from the entire question.) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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557 views

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bit fields - c union and bitfields

Can bitfields be used in union? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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bit manipulation - Converting 8 bit color into RGB value

I'm implementing global illumination in my game engine with "reflective shadow maps". RSM has i.a. color texture. To ... (packed << 6) * 64; See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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bit manipulation - XORing two doubles in Java

How to XOR two doubles in JAVA? simple '^' doesn't work for doubles... Would I have to convert a double to ... ? or is there any other way? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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bit manipulation - Is it possible to write a function adding two integers without control flow and strictly bitwise operations?

I misunderstood a question that said to add two integers using bitwise operations. I did not use any control ... is cancannot be accomplished? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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bit manipulation - How to extract specific bits from a number in C?

I need to extract specific part (no of bits) of a short data type in C. For Example I have a binary of 52504 ... 16 bits and so on so forth. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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537 views

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bit manipulation - When to use Bitwise Operators during webdevelopment?

Although I grasp the concept of Bitwise Operators, I can't say that I have come across many use cases ... Bitwise Operators in web languages. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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670 views

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bit manipulation - How can I remove a flag in C?

There is a variable that holds some flags and I want to remove one of them. But I don't know how to ... the flag. my.emask |= ENABLE_SHOOT; See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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bit manipulation - Obtain a specific subset of bits of an int in Java

How would I obtain a specific subset, say bits 5-10, of an int in Java? Looking for a method where one can pass in ... think) int x = num >> 22; See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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bit manipulation - What is the best practice way to create a bitmask for a range of bits?

I can think of three ways to do this off the top of my head. I'll outline them real quick. char mask = (1<<top) mask ... 1<<top)-1)^((1<<bot)-1) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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528 views

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bit manipulation - How to do a bitwise NOR Gate in Python (editing python maths to work for me)

Say I was to write this: a=01100001 b=01100010 c=01100011 d=01100100 e=01100101 each letter resembles the given numbers now ... 0+0=1) ... e.g See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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836 views

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bit manipulation - Calculating Hamming weight efficiently in matlab

Given a MATLAB uint32 to be interpreted as a bit string, what is an efficient and concise way of counting how ... bitand(w, uint32(65535)); See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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737 views

1 answer

bit manipulation - Check if a number x is positive (x>0) by ONLY using bitwise operators in C

isPositive - return true if x > 0, otherwise false Example: isPositive(-1) Legal ops: ! ~ & ^ | + << >> ... (int32_t x) { return ???; } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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