I have 2 tables that have a many to many relationship; An Individual can belong to many Groups. A Group can have many Individuals. Individuals basically just have their Primary Key ID Groups have a Primary Key ID, IndividualID (same as the ID in the Individual Table), and a bit flag for if that group is the primary group for the ind...
This is one of the most used Regex functions Regex.IsMatch("Test text for regex test.", "(test)", RegexOptions.IgnoreCase | RegexOptions.Multiline); Can you explain how Regex.IsMatch method works ? I mean how it handles bitwise OR RegexOptions parameters ? How it defines method parameters ? Thanks for replies ! ...
I have four flags Current = 0x1 Past = 0x2 Future = 0x4 All = 0x7 Say I receive the two flags Past and Future (setFlags(PAST | FUTURE)). How can I tell if Past is in it? Likewise how can I tell that Current is not in it? That way I don't have to test for every possible combination. ...
As per this website, I wish to represent a Maze with a 2 dimensional array of 16 bit integers. Each 16 bit integer needs to hold the following information: Here's one way to do it (this is by no means the only way): a 12x16 maze grid can be represented as an array m[16][12] of 16-bit integers. Each array element would contains all t...
I've a few lines of code within a project, that I can't see the value of... buffer[i] = (currentByte & 0x7F) | (currentByte & 0x80); It reads the filebuffer from a file, stored as bytes, and then transfers then to buffer[i] as shown, but I can't understand what the overall purpose is, any ideas? Thanks ...
I often use ($var & 1) in my code, which returns true if $var is an odd number and false if it's an even number. Just dawned on me that I have no idea what "&" actually does. Anyone care to explain? ...
In SQL Server I have been using the ^ symbol however that doesn't seem to work in Oracle. How do I do a bitwise exclusive OR in Oracle?? Thanks ...
I was reading about flag enums and bitwise operators, and came across this code: enum file{ read = 1, write = 2, readandwrite = read | write } I read somewhere about why there is a inclusive or statement and how there can't be an &, but can't find the article. Can someone please refresh my memory and explain the reasoning? Also, how ...
In application frameworks I keep seeing frameworks that allow you to pass in multiple Int values (generally used in place of an enum) into a function. For example: public class Example { public class Values { public static final int ONE = 0x7f020000; public static final int TWO = 0x7f020001; public sta...
I have a tree control with checkboxes next to each node that allows for checked, unchecked and middle checked states on the nodes. When clicking a node, the parent and children are updated. The code I found that does the trick uses bit shifting and I'm trying to understand what exactly is happening. Can someone explain the following cod...
I was wondering if you can do bitwise operations on an int/uint fields in SQL SERVER? ...
Hi, I am trying to learn C programming, and I was studying some source codes and there are some things I didn't understand, especially regarding Bitwise Operators. I read some sites on this, and I kinda got an idea on what they do, but when I went back to look at this codes, I could not understand why and how where they used. My first ...
I have an array of 128 booleans that represent bits. How can I convert these 128 bit representations into 16 bytes? Example: I have an array that looks like this: 0110001100110000100010111011001011010011010001010001101101001100 1000010000000000001000111111111101000011111001111011111011111001 (Converted to 1s and 0s to be more concis...
Left and right shift operators (<< and >>) are already available in C++. However, I couldn't find out how I could perform circular shift or rotate operations. How can operations like "Rotate Left" and "Rotate Right" be performed? Rotating right twice here Initial --> 1000 0011 0100 0010 should result in: Final --> 1010 0000 110...
I have a table that has 4 sets of 25 columns in a BIT concept. Actually field is smallint but it is either 0 or 1 in it's data. Here is my code that is an attempt to get the total for the first group of 25 cols. Declare @rows int , @ID uniqueidentifier , @LocTotal bigint select @rows = ( select count(*) from #t1 ) while @rows > 0 ...
I'm trying to write a function in assembly (but lets assume language agnostic for the question). How can I use bitwise operators to set all bits of a passed in number to 1? I know that I can use the bitwise "or" with a mask with the bits I wish to set, but I don't know how to construct a mask based off some a binary number of N size....
I'm attempting to write a function in assembly that will detect if a longer binary number contains a smaller binary pattern. Example: Does 100111 contain 1001? When I read this problem I figured that I would do a bitwise-AND with the large number and its smaller pattern while shifting right (logical) each time in a loop. So, in my hea...
What's the fastest way to enumerate through an integer and return the exponent of each bit that is turned on? Have seen an example using << and another using Math.Pow. Wondering if there is anything else that's really fast. Thanks. ...
Duplicate: Best algorithm to count the number of set bits in a 32-bit integer? Suppose you have a number. Is there any way to count the bits which equals to 1 in binary representation of that number, not using iteration? I mean, is there any way to do it in constant time using some bitwise operators and masks. I need solution whi...
Hi! I'm working on a little project for college, and I need to model transmission over network, and to impment and visualize different sorts of error correction algorithms. My improvized packet consists of one quint8: I need to convert it into a bit array, like QBitArray, append a check bit to it, trasfer it over UDP, check the success o...