# What is a byte swap?

## What is a byte swap?

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”).

How do you reverse a byte?

Efficient approach:

1. Move the position of the last byte to the first byte using left shift operator(<<).
2. Move the position of the first byte to the last byte using right shift operator(>>).
3. Move the middle bytes using the combination of left shift and right shift operator.

How do you change nibbles in a byte?

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 a nibble C++?

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).

How do you reverse a bit in C++?

Reverse Bits in C++ answer := answer OR (n AND i), and shift it to the left i times. n := n after right shifting 1 bit.

How do you flip all bits of a number?

Program to invert bits of a number Efficiently

1. Calculate the total number of bits in the given number. This can be done by calculating: X = log2N.
2. The next step is to generate a number with X bits and all bits set.
3. The final step is to calculate the bit-wise XOR of M with N, which will be our answer.

#### How many nibbles are in a bite?

Common binary number lengths

Length Name Example
1 Bit 0
4 Nibble 1011
8 Byte 10110101

How do you separate nibbles?

To get the nibbles separately, at first we are taking number into B register as a copy. Now mask upper nibble to get lower nibble and store it, then take the number from B again, mask lower nibble to get upper nibble, then rotate it four times to make it lower order nibble, after that store it to another location.

Is kilobyte 1000 or 1024 bytes?

Answer: Many people think that there are 1000 bytes in a kilobyte. But there are really 1024 bytes in a kilobyte. The reason for this is because computers are based on the binary system. That means hard drives and memory are measured in powers of 2.

## What is different between bit and byte?

– First of All, bits and bytes, both are used to represent data length. – A single bit means It can represent a logical level or data in either 0 or 1 only. – Whereas, a byte is a collection of 8 bits, i.e 1 Byte= 8 bits.

How to compare two files byte by byte?

Name

• Synopsis
• Description. Compare two files byte by byte. Print differing bytes.
• Author. Written by Torbjorn Granlund and David MacKenzie.
• Reporting Bugs. Report bugs to < [email protected] >.