bitarray

I am learning C/C++ programming & have encountered the usage of 'Bit arrays' or 'Bit Vectors'. Am not able to understand their purpose? here are my doubts - Are they used as boolean flags? Can one use int arrays instead? (more memory of course, but..) What's this concept of Bit-Masking? If bit-masking is simple bit operations to get an appropriate flag, how do one program for them? is it not difficult to do this operation in head to see what the flag would be, as apposed to decimal numbers? I am looking for applications, so that I can understand better. for Eg - Q. You are given a file

1). var bitValue = (byteValue & (1 << bitNumber)) != 0; 2). using System.Collections.BitArray with a Get(int index) method What is faster? In what situations for the .NET projects BitArray could be more useful than a simple conjunction with the bitwise shift? BitArray is going to be able to handle an arbitrary number of boolean values, whereas a byte will hold only 8, int only 32, etc. This is going to be the biggest difference between the two. Also, BitArray implements IEnumerable , where a integral type obviously does not. So it all depends on the requirements of your project; if you need an

This code: BitArray bits = new BitArray(new byte[] { 7 }); foreach (bool bit in bits) { Console.WriteLine(bit ? 1 : 0); } Gives me the following output: 11100000 Shouldn't it be the other way around? Like this: 00000111 I am aware that there is little and big endian, although those terms only refer to the position of bytes. As far as I know, they don't affect bits. The documentation for BitArray states: The first byte in the array represents bits 0 through 7, the second byte represents bits 8 through 15, and so on. The Least Significant Bit of each byte represents the lowest index value: "

In an assignment I am currently working on we need to work with bit vectors, but I am very unsure of how to do this in Python. They should be able to be from 4 bits to 20 bits. I have never worked with bit vector before, but I guess that one would one create arrays of unsigned bytes that you manipulated using the usual AND/OR/XOR operations. The important restriction here is: I cannot rely on any libraries other than those supplied with standard Python. I think I know how I would do this in C using arrays of 8 bit unsigned bytes: e.g. to turn the 18th bit of a zeroed array into a one, I would

I have a BitArray with the length of 8, and I need a function to convert it to a byte . How to do it? Specifically, I need a correct function of ConvertToByte : BitArray bit = new BitArray(new bool[] { false, false, false, false, false, false, false, true }); //How to write ConvertToByte byte myByte = ConvertToByte(bit); var recoveredBit = new BitArray(new[] { myByte }); Assert.AreEqual(bit, recoveredBit); This should work: byte ConvertToByte(BitArray bits) { if (bits.Count != 8) { throw new ArgumentException("bits"); } byte[] bytes = new byte[1]; bits.CopyTo(bytes, 0); return bytes[0]; } A

I want to create a very large array on which I write '0's and '1's. I'm trying to simulate a physical process called random sequential adsorption, where units of length 2, dimers, are deposited onto an n-dimensional lattice at a random location, without overlapping each other. The process stops when there is no more room left on the lattice for depositing more dimers (lattice is jammed). Initially I start with a lattice of zeroes, and the dimers are represented by a pair of '1's. As each dimer is deposited, the site on the left of the dimer is blocked, due to the fact that the dimers cannot