Byte

# Swap nibbles in c

## What does swap nibbles mean?

A nibble is a four-bit aggregation, or half an octet. ... Given a byte, swap the two nibbles in it. For example 100 is be represented as 01100100 in a byte (or 8 bits). The two nibbles are (0110) and (0100). If we swap the two nibbles, we get 01000110 which is 70 in decimal.

## What will be the macro for swapping two nibbles in byte?

The two nibbles are (0110) and (0100). ... To swap the nibbles, we can use bitwise &, bitwise ” operators. A byte can be represented using a unsigned char in C as size of char is 1 byte in a typical C compiler.

## What is nibble in C language?

A nibble consists of four bits. There are two nibbles in a byte. For example, 64 is to be represented as 01000000 in a byte (or 8 bits). The two nibbles are (0100) and (0000).

## What is byte swapping?

To review, byte swapping reverses the order of bytes in a integer (whether 2-, 4-, or 8-byte lengths). This is necessary as x86 processors store the low order byte of an integer first ("little endian"), and SPARC processors store the high-order byte first ("big endian").

## What is upper nibble and lower nibble?

1 Answer. 1. Nibble is half a byte (0-15, or one hex digit). Low nibble are the bits 0-3; high nibble are bits 4-7.

## How do Bitwise operators work in C?

Bitwise Operators in C/C++ The & (bitwise AND) in C or C++ takes two numbers as operands and does AND on every bit of two numbers. ... The ^ (bitwise XOR) in C or C++ takes two numbers as operands and does XOR on every bit of two numbers. The result of XOR is 1 if the two bits are different.

## How do you swap two bits in a number?

The idea is to first find the bits, then use XOR based swapping concept, i..e., to swap two numbers 'x' and 'y', we do x = x ^ y, y = y ^ x and x = x ^ y.

## Which is bigger byte or nibble?

Common binary number lengths

Each 1 or 0 in a binary number is called a bit. From there, a group of 4 bits is called a nibble, and 8-bits makes a byte.

## What is nibble and word?

Bit: 1 digit. Nibble: 4 digits. Byte: 8 digits. Word: The standard memory bus width in your architecture. (e.g. 16-bit, 32-bit, 64-bit words).

## What is a nibble in binary number system?

In computers and digital technology, a nibble (pronounced NIHB-uhl; sometimes spelled nybble) is four binary digits or half of an eight-bit byte. A nibble can be conveniently represented by one hexadecimal digit.

## What is endianness of a system?

In computing, endianness is the order or sequence of bytes of a word of digital data in computer memory. ... A big-endian system stores the most significant byte of a word at the smallest memory address and the least significant byte at the largest.

## What is byte swapping in Numpy?

byteswap() function toggle between low-endian and big-endian data representation by returning a byteswapped array, optionally swapped in-place.

## Why is endianness necessary?

So knowledge of endianness is important when you are reading and writing the data across the network from one system to another. If the sender and receiver computer have different endianness, then the receiver system would not receive the actual data transmitted by the sender.

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