uint32

i have some low level image/texture operations where 32-bit colors are stored as UInt32 or int and i need a really fast bitwise conversion between the two. e.g. int color = -2451337; //exception UInt32 cu = (UInt32)color; any ideas? thanks and regards int color = -2451337; unchecked { uint color2 = (uint)color; // color2 = 4292515959 } Jader Dias BitConverter.ToUInt32(BitConverter.GetBytes(-2451337), 0) Those using a language like VB, which don't have a really convenient way of disabling overflow checks during the conversion, could use something like: Shared Function unsToSign64(ByVal val As

What is the difference between Int32 and UInt32 ? If they are the same with capacity range capabilities, the question is for what reason UInt32 was created? When should I use UInt32 instead of Int32 ? UInt32 does not allow for negative numbers. From MSDN : The UInt32 value type represents unsigned integers with values ranging from 0 to 4,294,967,295. Randy Minder An integer is -2147483648 to 2147483647 and an unsigned integer is 0 to 4294967295. This article might help you. uint32 is an unsigned integer with 32 bit which means that you can represent 2^32 numbers (0-4294967295). however in

Edit: This question is out of date as the Polyfill example has been updated. I'm leaving the question here just for reference. Read the correct answer for useful information on bitwise shift operators. Question: On line 7 in the Polyfill example of the Mozilla Array.prototype.indexOf page they comment this: var length = this.length >>> 0; // Hack to convert object.length to a UInt32 But the bitwise shift specification on Mozilla clearly states that the operator returns a value of the same type as the left operand: Shift operators convert their operands to thirty-two-bit integers and return a

Possible Duplicate: Difference between different integer types What is the difference between uint32 and uint32_t in C/C++? Are they OS dependent? In which case should I use one or another? Thanks uint32_t is standard, uint32 is not. That is, if you include <inttypes.h> or <stdint.h> , you will get a definition of uint32_t . uint32 is a typedef in some local code base, but you should not expect it to exist unless you define it yourself. And defining it yourself is a bad idea. uint32_t is defined in the standard, in 18.4.1 Header <cstdint> synopsis [cstdint.syn] namespace std { //... typedef

I have a property of type uint on my entity. Something like: public class Enity { public uint Count {get;set;} } When I try to persist that into the SQL Server 2005 database, I get an exception Dialect does not support DbType.UInt32 What would be the easiest way to workaround this. I could for example store it as long in the DB. I only don't know how to tell that to NHibernate. The cleanest, most official solution would probably be to write a user type. Take an example, like this one and adapt it. If you have many uint 's, it is worth to have a user type. <property name="Prop" type=

This might be a simple one, but I can't seem to find an easy way to do it. I need to save an array of 84 uint's into an SQL database's BINARY field. So I'm using the following lines in my C# ASP.NET project: //This is what I have uint[] uintArray; //I need to convert from uint[] to byte[] byte[] byteArray = ??? cmd.Parameters.Add("@myBindaryData", SqlDbType.Binary).Value = byteArray; So how do you convert from uint[] to byte[]? How about: byte[] byteArray = uintArray.SelectMany(BitConverter.GetBytes).ToArray(); This'll do what you want, in little-endian format... You can use System.Buffer

I have this expression which returns a UInt32 : let randomLetterNumber = arc4random()%26 I want to be able to use the number in this if statement: if letters.count > randomLetterNumber{ var randomLetter = letters[randomLetterNumber] } This issue is that the console is giving me this Playground execution failed: error: <REPL>:11:18: error: could not find an overload for '>' that accepts the supplied arguments if letters.count > randomLetterNumber{ ~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~ The problem is that UInt32 cannot be compared to an Int . I want to cast randomLetterNumber to an Int . I have

What is the fastest way to count the number of set bits (i.e. count the number of 1s) in an UInt32 without the use of a look up table? Is there a way to count in O(1) ? Manuel Amstutz Is a duplicate of: how-to-implement-bitcount-using-only-bitwise-operators or best-algorithm-to-count-the-number-of-set-bits-in-a-32-bit-integer And there are many solutions for that problem. The one I use is: int NumberOfSetBits(int i) { i = i - ((i >> 1) & 0x55555555); i = (i & 0x33333333) + ((i >> 2) & 0x33333333); return (((i + (i >> 4)) & 0x0F0F0F0F) * 0x01010101) >> 24; } The bit-twiddling hacks page has a

When should one use the datatypes from stdint.h? Is it right to always use as a convention them? What was the purpose of the design of nonspecific size types like int and short? When should one use the datatypes from stdint.h? When the programming tasks specify the integer width especially to accommodate some file or communication protocol format. When high degree of portability between platforms is required over performance . Is it right to always use as a convention them (then)? Things are leaning that way. The fixed width types are a more recent addition to C. Original C had char, short,