Byte From Int

In java int data type take 4 bytes (32 bits) and it's range is -2,147,483,648 to 2,147,483, 647. This will help indexing and searching be more efficient. SystemVerilog also has many other 2-state data types in addition to all the data types supported by Verilog. using System; public class Example { public static void Main() { // Create an Integer from a 4-byte array. conversion to 4 bytes integer representation. Specification. 64-bit Integers. a number which is not a fraction; a whole number. First, BitArray has many constructors, including ones that receive int32, int32 arrays, byte arrays and default values. What i need now is a getPixel function which returns an long integer representing the four bytes which make up the color of a particular pixel. Recently I was looking for a class which could convert a System. Since java use one bit to mark sign, so we can make it without using 3-party lib. The logic behind to implement this program - right shift value according to byte position and mask it for One byte value (0xff). The int data type is a word and Arduino comes with highByte() and lowByte() to extract the left and right byte from a word. """ Convert a signed integer value of specified width into a byte string. ToInt16(buf, 0), but this function require the buf length is 2, if my buf length is 1, Can I convert it to integer values without converting the buf to length 2 buf?. Byte Convert. ConvertDataTypes is the helpfull website for converting your data types in several programming languages. Two byte addressing extends the limit on the number of slaves in a network to 65535. This macro expands to sequential integral values starting from 0. Scribd is the world's largest social reading and publishing site. You can fix this by casting: static byte[] bytearray = {0x02, 0x08, 0x16, 0x0, 0x00, 0x33, (byte) 0xC6, 0x1B}; Or, you can use the negative, in-range value of -0x3A (which is equivalent to 0x36 in two's-complement notation). I know converting an IP address to an integer (and back) is something that's been done a million times over; but for me, personally, it's new and ripe for practice. A tablespace is a container for segments (tables, indexes, etc). ReadBytes Method I read some stuff as bytes , but actually they were int. 1 KB = 1024 Bytes; 1 MB = 1024 * 1024 Bytes; 1 GB = 1024 * 1024 * 1024 Bytes. Generally, I'm dealing with a byte stream that I want to output as a string of hex. 1) is performed on the operand. typecast always returns the same number of bytes in the output Y as in the input X. c++中byte数组是不能传递的,byte指针倒是可以传递,但我一直拿不到正确的长度(或许只是我没找对方法)。我在网上也很少能找到string转byte[]或byte[]转string的例子,即使有,基本上也不能使用。. C# / C Sharp Forums on Bytes. However, when you read an integer using the "read integer" call, you read an 8-bit integer, that is, ranging from 0 to 255. Kilobytes and gigabytes are also handled. The BitConverter class in. If all you know about computers is how to save text files, then this is the book for you. This refers to objects that implement the Buffer Protocol and provide either a readable or read-writable buffer. Generates an arbitrary length string of cryptographic random bytes that are suitable for cryptographic use, such as when generating salts, keys or initialization vectors. a number which is not a fraction; a whole number. It needs 1 or 4 bytes to represent each symbol. It is always worth warning you about this. So I nedd to convert the 8-bit byte in python to signed int to make comparison done. ) Size of the data (how many bytes is in e. ASCII stands for American Standard Code for Information Interchange. The C++ language guarantees a byte must always have at least 8 bits. We must mask the sign bit to JAVA, cast to an integer and process the masked bit if needed. Python Bytes, Bytearray: Learn Bytes literals, bytes() and bytearray() functions, create a bytes object in Python, convert bytes to string, convert hex string to bytes, numeric code representing a character of a bytes object in Python, define a mapping table characters for use with a bytes object in Python, convert bytes to hex in Python, how to get the character from the numeric code in bytes. Bit format that is needed to add to a basic Pointer Offset to access a list of BOOLS in a DB. I just need to change Type and send it on serial port. The Data value type allows simple byte buffers to take on the behavior of Foundation objects. Need help? Post your question and get tips & solutions from a community of 446,600 IT Pros & Developers. Public Declare Auto Function PlaySound Lib "winmm. Integers are always represented in twos-complement form in the native byte-encoding order of your system. enum-like constants for an integer value). In this article, we will discuss various techniques of converting int to a byte array and vice versa, int array to byte array and so on. Random Numbers are a cryptographic primitive and cornerstone to nearly all cryptographic systems. Actually, there is no mB or gB convention, although that would have been logic in the original. int RAND_pseudo_bytes(unsigned char *buf, int num); DESCRIPTION. How to convert 2 byte data to integer?. When packing signed bytes into an int, each byte needs to be masked off because it is sign-extended to 32 bits (rather than zero-extended) due to the arithmetic promotion rule. I try to make it receive data in one line In code below i need to take weight fro weight bridge machine automatically by timer in visual studio 2005. byte* means "pointer to byte(s). from_bytes(bytes, byteorder, *, signed=False) -> int Parameters. C# / C Sharp Forums on Bytes. Since Oracle 7 the DATE datatype is stored in a proprietary format. For some application processes, it's necessary to manipulate the format. write() writes up to count bytes from the buffer pointed buf to the file referred to by the file descriptor fd. To make such a component read from the data from an array, you will have to wrap the byte or char array in an ByteArrayInputStream or CharArrayReader. If you are writing code for a new project or new codebase, you can use this idiom to make all string literals in a module unicode strings:. It has methods to convert int values to different Strings for displaying. In Figure 3. If no unit is given, or value is a number, it is assumed the value is in bytes. ConstrainedCopy method is then called. RAND_priv_bytes() has the same semantics as RAND_bytes(). At first, glance converting the datatype (System. Copy method will silently copy a byte array to an int array. To keep the answer as a byte, cast them // to a byte with the byte() conversion function byte c = byte(a + b); Description: Datatype for bytes, 8 bits of information storing numerical values from 127 to -128. 28 billion daily active users. C - Fastest way to copy two bytes integer number (short int) into byte buffer By: IncludeHelp , on 21 JAN 2017 Use memcpy() to copy fixed number of bytes into buffer, by using this function we can easily copy (convert) a short int value into Byte buffer. Find anything that can be improved? Suggest corrections and new documentation via GitHub. A byte will always be the same size as an ansiChar, but in the future char may be considered a synonym for wideChar, not ansiChar. 94 billion monthly active users, as of March 2017 — and around 1. On the i386 the host byte order is Least Significant Byte first, whereas the network byte order, as used on the Internet, is Most. Compatibility with Python 2. This is used to indicate what kind of data is in the byte array. Random Byte Generator. The slice is valid for use only until the next buffer modification (that is, only until the next call to a method like Read, Write, Reset, or Truncate). , an integer that conforms to the pattern [0-9]+. How to convert 2 byte data to integer?. I think I have a handle on all the other data types, but I'm not sure about how to get from an array of 4 bytes that make up an integer to the integer itself or a string representation of the integer. from_bytes(bytes, byteorder, *, signed=False) -> int Parameters. The results will return all possible conversion options (bits, bytes, kilobytes, megabytes, gigabytes, terabytes, petabytes, and exabytes). With 0x0F you would extract half a byte (4 bits). Random Numbers are a cryptographic primitive and cornerstone to nearly all cryptographic systems. In some cases, you may want to go the other way, from Python string to int. 问题 I would like to convert a java. If the string contains anything besides an integer, this will fail and generate an exception. Unlike string objects, indexing a bytes object returns an integer. The end of the file is marked by a single byte, with the end-of-file marker, an OEM code page character value of 26 (0x1A). This yields a range of -32,768 to 32,767 (minimum value of -2^15 and a maximum value of (2^15) - 1). Look at the Integer class. This article introduces Java — a simple, object oriented, high performance language — and digs into the eight primitive data types (byte, short, int, long, float, double, boolean, and char. If we have list of int, how do we convert into byte[]? If we have a list of Int, long and float combination, how to convert List into byte[]?. Integer overflow is the result of trying to place into computer memory an integer (whole number) that is too large for the integer data type in a given system. intValue() method. The technique used is to determine which bits within the variable will be affected and then calculate where those bits will wind up after the rotate. It is intended to be used for generating values that should remain private. C# / C Sharp Forums on Bytes. By: IncludeHelp, on 21 JAN 2017. I have a binary file, which stores each integer value in just 1 byte, is it possible to convert 1 byte directly into an integer value? I know, there is function like: BitConverter. How to convert a bool array to a byte, and further to an integer? 2D array to byte array. This has led Facebook to break records numbers with over 1. Java makes converting an integer to a string easy through one of its internal functions. I am writing a byte array value into a file, consisting of up to three of these arrays, using Java with big Endian byte order format. The statement you quoted doesn't tell us anything about this either way - but other statements do confirm it. When written in assembly language, the instruction is written like this: INT X. An array object represents a multidimensional, homogeneous array of fixed-size items. This article introduces Java — a simple, object oriented, high performance language — and digs into the eight primitive data types (byte, short, int, long, float, double, boolean, and char. byte[] val = new byte[str. Need help? Post your question and get tips & solutions from a community of 446,600 IT Pros & Developers. Processing Forum Recent Topics. I kept typing bytes(5) now i know i have to type bytes([5]) because bytes() only converts int into bytes if it receives the int from an array. Such a pain. GetBytes(Int32) Returns the specified 32-bit signed integer value as an array of bytes. converting char array to integer. How can I convert a unity heightmap to VBA integer array. Other systems, such as Java, will want an integer where bits 0-7 are the red value, 8-15 the green, and 16-23 the blue. 64 KB; Introduction. If all you know about computers is how to save text files, then this is the book for you. For some application processes, it's necessary to manipulate the format. What i need now is a getPixel function which returns an long integer representing the four bytes which make up the color of a particular pixel. 94 billion monthly active users, as of March 2017 — and around 1. I have some idea of what you are doing, but perhaps you need to step back and think about design. By writing the 4 bytes you have to the union through the byte array the fill up the memory of the union. InetAddress and I fight with the signed / unsigned problems. Java has 8 primitive data types; char, boolean, byte, short, int, long, float, and double. Example given. Byte in Java is represented by signed int in range (-128, 127), Byte Python is represented by unsigned int in range(0, 255). I'm reading EEPROM memory locations used by a CPU. This page will let you enter in RGB values, and by pressing evaluate, see the correspinding hexadecimal and integer representations of the color. dll" (ByVal pszSound As String, ByVal hmod As IntPtr, ByVal fdwSound As Integer) As Boolean Public Declare Auto Function PlaySound Lib "winmm. Example given. Convert int to long in C#. The byte takes 1 byte of memory and int takes 4 bytes of memory. unsigned char b; // reverse this (8-bit) byte b = (b * 0x0202020202ULL & 0x010884422010ULL) % 1023; The multiply operation creates five separate copies of the 8-bit byte pattern to fan-out into a 64-bit value. Product range: Industrial PCs, I/O and Fieldbus Components, Drive Technology and automation software. varName is the name of your variable. I could create an array of 5 unsigned chars, but how to store the number?. I think I have a handle on all the other data types, but I'm not sure about how to get from an array of 4 bytes that make up an integer to the integer itself or a string representation of the integer. It looks like your function does have a length value. Image to byte[] array and vice versa. But I see that `int. A bytes object stores a mutable sequence of integers that are in the range 0 to 255. Beckhoff implements open automation systems based on PC Control technology. If all you know about computers is how to save text files, then this is the book for you. Otherwise, if the operand is of compile-time type byte, short, or char, it is promoted to a value of type int by a widening primitive conversion (§5. The most common numeric conversions are Atoi (string to int) and Itoa (int to string). We see its numeric and character-based representation. Topic: Byte to Int Conversion (Read 76621 times) previous topic - next topic. Several struct functions (and methods of Struct) take a buffer argument. Unless space is a primary consideration, you should concentrate on a clean design. 0, Java will think, okay, this is a double. For example how can I know if 256,379 is 3-bytes with php? I need a php function to pass 256,379 as input and get 3 as output. from_bytes is the best solution if you are at version >=3. I could create an array of 5 unsigned chars, but how to store the number?. Length * sizeof (int)]; Buffer. You may also want to use this method to display the size of files. If our intention is to see that byte as a value between -128 and 127, we must cast to signed char before casting to int. Count is one. The INTEGER is the most common choice between integer types because it offers the best balance between storage size, range, and performance. You may have to register before you can post: click the register link above to proceed. Find anything that can be improved? Suggest corrections and new documentation via GitHub. Notes If the buffer has data that is not in machine byte-order, this should be specified as part of the data-type, e. On the JVM, non-nullable values of this type are represented as values of the primitive type int. Assignment 1 byte value to 4 bytes is done implicitly by the JVM. In Figure 3. In Java, it is not uncommon to manually convert an int (signed 32-bit integer) to and from an array of bytes. Issues with byte order are sometimes called the NUXI problem: UNIX stored on a big-endian machine can show up as NUXI on a little-endian one. ASCII Codes, Bits & Bytes, Character Code Calculator, CHMOD Calculator, Common Conversions, File Types, HTTP Status Codes, Password Generator, TCP/IP, Viruses, Using Windows Calculator with Binary Numbers "There are 10 types of people in the world:. Others have shown you how to convert it to a string assuming the byte* is a pointer to a character array. Return the integer represented by the given array of bytes. Expressions like nOffset & 0x0F are evaluated to an int (4 bytes) so to assign the result to a byte you must explicitly covert it. byte和int类型的区别是: 1、类型不一样,byte是字节数据的类型,int是整型数据的类型。 2、占用的字节不一样,byte占用1 个字节,int占用4个字节。 3、大小范围不一样,byte 的大小范围是-128—127 ,int的大小范围是-2147483648到2147483647。. But im unsure if that matches the following specification: An XDR signed integer is a 32-bit datum that encodes an integer in the range [-2147483648,2147483647]. One of the variables I want to read is an integer value that can be a negative value. If the read() method encounters a 0xFF byte in the file, this value becomes indistinguishable from the −1 value used to indicate the end of stream, because the byte value is promoted and sign-extended to an int before being compared with −1. DecodedLen returns the length of a decoding of x source bytes. java) public class Example { public static void main (String [] args) { // create integer using specified int value. No kidding!) Dim hex_result As String = "" For nibble_num As Integer = 0 To 15 ' Convert this nibble into a hexadecimal string. It supports endianness as well as immutability and mutability, so the caller may decide to favor performance. from_bytes() argument 2 must be str, not int. int to byte) the conversion is done modulo the length of the smaller type. The ^ operator, in this case, returns an integer. The bytes() takes three optional parameters: source (Optional) - source to initialize the array of bytes. Random Numbers are a cryptographic primitive and cornerstone to nearly all cryptographic systems. Type Size (bytes) Range In Use sbyte 1 –128 to 127 sbyte sb = -12; byte 1 0 to 255 byte b = 12; short …. Bytes is a utility library that makes it easy to create, parse, transform, validate and convert byte arrays in Java. 7 Bytes Data Type. If we used __int64 (a 64-bit type) instead of unsigned int and 18446744073709551610 instead of 4294967290, the result would have been the same. integer types (int, uint and byte, etc) float types (float, decimal, etc) If we pass in an int, it is silently boxed into an object, as can be seen from the test code, which returns an object not an int. These bytes store the century, year, month, day, hour, minute, and second details respectively. How to Convert a Byte Array to Integer in …. Returning an int array from a function. int_from_bytes(). Hi!I'm extracting date and time using READ_CLK (SFC1). How to convert 2 byte data to integer?. First of all, the byte type in Java is an 8-bit signed two's complement integer. With 0x0F you would extract half a byte (4 bits). Ford Department of Math. The syntax of bytes() method is: bytes([source[, encoding[, errors]]]) The bytes() method returns a bytes object which is an immmutable (cannot be modified) sequence of integers in the range 0 <=x < 256. Note that rounding errors may occur, so always check the results. 2 Integer Types (Exact Value) - INTEGER, INT, SMALLINT, TINYINT, MEDIUMINT, BIGINT MySQL supports the SQL standard integer types INTEGER (or INT ) and SMALLINT. It loops through the bytes and counts instances matching our specified pattern. The goal of the Message Passing Interface is to establish a portable, efficient, and flexible standard for message passing that will be widely used for writing message passing programs. Length); If you are trying to convert individual values to a byte each then use Linq:. Kilobytes and gigabytes are also handled. If you are writing code for a new project or new codebase, you can use this idiom to make all string literals in a module unicode strings:. If the read() method encounters a 0xFF byte in the file, this value becomes indistinguishable from the −1 value used to indicate the end of stream, because the byte value is promoted and sign-extended to an int before being compared with −1. To make such a component read from the data from an array, you will have to wrap the byte or char array in an ByteArrayInputStream or CharArrayReader. How to send 1 byte from android to arduino. What I have problem with is when I try to convert each byte to a string. For example, if an integer data type allows integers up to two bytes or 16 bits in length (or an unsigned number up to decimal 65,535), and two integers are to be added together that. Unary Minus Operator - …Unary numeric promotion (§5. I'm not sure if it is my. The 80286 had a 16 bits Integer. If our intention is to see that byte as a value between -128 and 127, we must cast to signed char before casting to int. I have tried converting byte to int and then outputting it's (int's) binary representation as String like you said: System. For bitn and ubitn precisions, machinefmt specifies the order for reading bits within a byte, but the order for reading bytes remains your system byte ordering. combining 2 bytes into an int then convert to 2 byte hex! If this is your first visit, be sure to check out the FAQ by clicking the link above. Convert bytes, megabytes. If the string contains anything besides an integer, this will fail and generate an exception. A word is 2 bytes (except on Due, Zero and similar boards where it is 4 bytes), which already gets you a huge range of 65536 (256 2). Read(bytes, numBytesRead, 10) ' The end of the file is reached. Like JSON, BSON sup­ports the em­bed­ding of doc­u­ments and ar­rays with­in oth­er doc­u­ments and ar­rays. RAND_priv_bytes() has the same semantics as RAND_bytes(). But surely not 16-bit bytes or 32-bit bytes, right? Wrong. 8 bytes signed (two's complement). This has led Facebook to break records numbers with over 1. ToByte(String) Converts the specified string representation of a number to an equivalent 8-bit unsigned integer. If we cast a byte, that is, an unsigned char, to and int, we'll get a value between 0 and 255, since int, even thpugh it's signed, contains that range of values. Can hold values from -32,768 to 32,767. Thank you for your effort. com Convert data types programming in one click !. I write a lot of ad-hoc protocol analysers using Python. Bit Pointer Format Has anybody got a routine handy that will take an INT as input (1 - 21) and convert it to the Byte. byte和int类型的区别是: 1、类型不一样,byte是字节数据的类型,int是整型数据的类型。 2、占用的字节不一样,byte占用1 个字节,int占用4个字节。 3、大小范围不一样,byte 的大小范围是-128—127 ,int的大小范围是-2147483648到2147483647。. It is usually used to point to a byte buffer, and usually will also have a length value so you know how many bytes are in the buffer. Image to byte[] array and vice versa. NET Framework is provides functionality to convert base data types to an array of bytes, and an array of bytes to base data types. Converting an integer to a string is a common practice when programming. Allowed data types: int. Convert bytes, megabytes. Using SYSCALL system services 31 and 33: MIDI output These system services are unique to MARS, and provide a means of producing sound. Can hold values from -128 to 127. NET Framework, BitConverter Class helps us to convert base Datatypes to an array of bytes and vice-versa. hashBytes(byte[], int) on the passed in array. On the JVM, non-nullable values of this type are represented as values of the primitive type int. Basically, that is a mish-mash of the ancient 70s convention of using kB for 1000 Bytes and KB for 1024 Bytes, and an abuse of the SI definitions of M and G prefixes. If the result is a numeric value then sqlite3_column_bytes() uses sqlite3_snprintf() to convert that value to a UTF-8 string and returns the number of bytes in that string. In this example there are 2 arrays—an integer array and a byte array—allocated on the managed heap. Since a negative element number doesn't make sense and you surely don't want to define more than 255 buttons, you can choose yourself, what you want to use. Example given. Does anyone know how to separate the individual bytes in an int? int is 4 bytes long and I want to take those bytes and put them into a char[4]. For example nSec will count up from 0-9 then make a jump to 16 and 59 will bec. There seems to be many examples of this when i search, but I've not had much luck except for one example. ) Official Scala data type documentation. In Figure 3. A word use to be 16 Bits and a Nibble 4 Bits. By writing the 4 bytes you have to the union through the byte array the fill up the memory of the union. If the resulting integer is greater than 255 (decimal), buf will be filled with value & 255. As far as I know, indexing a variable doesn't change its type, so since input is declared as uint8_t input1[4], input1[0] is an uint8_t, which when shifted up loses its value altogether. Converting between string and byte. Because computers store information in 8-bit bytes (where a bit is a single binary digit), depending on the "word size" of the machine, numbers requiring more than 8 bits must be stored in multiple bytes. S7 - Converting an INT to Byte. I believe the definition of a Byte is 8 Bits. The most common numeric conversions are Atoi (string to int) and Itoa (int to string). Assignment 1 byte value to 4 bytes is done implicitly by the JVM. // create a function with parameter of type Object let objFunction. This is an. At the smallest scale in the computer, information is stored as bits and bytes. Casting up is okay, so an int is implicitly going to be cast to a long, when needed. Hi!I'm extracting date and time using READ_CLK (SFC1). I read a file using char[] and I want to convert specific bytes to integer. This refers to objects that implement the Buffer Protocol and provide either a readable or read-writable buffer. Java defines four integer types: byte, short, int, and long. ByteString: Fast, Packed Strings of Bytes. A URL’s port is either null or a 16-bit unsigned integer that identifies a networking port. using System; public class Example { public static void Main() { // Create an Integer from a 4-byte array. Convert an integer value to byte, double, float, int, long and short. If the result is a numeric value then sqlite3_column_bytes() uses sqlite3_snprintf() to convert that value to a UTF-8 string and returns the number of bytes in that string. For example if you create a file Source. The second byte is your low order byte, and your third byte of data is the high order byte. An associated data-type object describes the format of each element in the array (its byte-order, how many bytes it occupies in memory, whether it is an integer, a floating point number, or something else, etc. I'll call this half avalanche. In java int data type take 4 bytes (32 bits) and it's range is -2,147,483,648 to 2,147,483, 647. It is a fixed collection of same data type that are stored contiguously and that are accessible by an index We specify their length and we can initialize arrays with data. I now have it so I can send or receive bytes with which I can control the arduino. INT is an assembly language instruction for x86 processors that generates a software interrupt. Returns -1 if str could not be found. Relative get method for reading an int value. Since a Java Integer occupies 4 bytes allocate a ByteBuffer of capacity 4 and write the Integer to ByteBuffer. In some cases, you may want to go the other way, from Python string to int. Converting an integer to a string is a common practice when programming. int is 4 bytes long may not be true in various systems. For Common, JVM, JS. Length Dim numBytesRead As Integer = 0 Dim n As Integer Do ' Read may return anything from 0 to 10. This example initializes an array of bytes, reverses the array if the computer architecture is little-endian (that is, the least significant byte is stored first), and then calls the ToInt32(Byte[], Int32) method to convert four bytes in the array to an int. Syntax int. BSON [bee · sahn], short for Bin­ary JSON, is a bin­ary-en­coded seri­al­iz­a­tion of JSON-like doc­u­ments. If you are writing code for a new project or new codebase, you can use this idiom to make all string literals in a module unicode strings:. Product range: Industrial PCs, I/O and Fieldbus Components, Drive Technology and automation software. ByteProcessor (int width, int height, byte[] pixels, java. Simple, elegant and efficient - what is it that makes developers go for the most complex solutions when you can do something like this. 1 GB is equal to 1073741824 byte. We must multiply it by 4, or the sizeof(int). This makes it really easy to encode and decode. Made by @mathias — powered by utf8. from_bytes implementations incomplete #682. How to convert 2 byte data to integer?. Allowed data types: int. , an integer that conforms to the pattern [0-9]+. As we discussed in C - Union tutorial that union takes memory for largest data type element and other variables share that memory. In embedded SQL, fetch TINYINT columns into 2-byte or 4-byte integer columns. A term often used when transmitting or moving areas of memory. Table 2-2 D Integer Data Types. Below I have code where the current byte is read into the variable 'byte". Convert byte to int in C#. It is intended to be used for generating values that should remain private. They are used in almost all areas of cryptography, from key agreement and transport to session keys for bulk encryption. From: jon Date: January 13 2007 8:14am Subject: svn commit - [email protected]: r4500 - branches/telcos branches/telcos/make. Screenplay Contest Information: Worldfest - Houston Int'l Film Festival. For Common, JVM, JS. I can read each byte into its own variable and spit them out 1 by 1 but cant convert them to an int, ie if I send 743 I can store the 7, 4 and 3 seperatly but cant merge them into a int to pass 743 to the delay. All Forums. InetAddress and I fight with the signed / unsigned problems. unpack method in Python 2. The byte takes 1 byte of memory and int takes 4 bytes of memory. Since a negative element number doesn't make sense and you surely don't want to define more than 255 buttons, you can choose yourself, what you want to use. 2 Common Predefined Macros. The Arduino Reference text is licensed under a Creative Commons Attribution-Share Alike 3. byte* means "pointer to byte(s). In this program, we are going to extract individual bytes from an unsigned integer variable using C programming language union. For example, here is the bit pattern for an int that holds the value 98:.