The most important use for a byte is holding a character code. Bit 0 (b0) is the low order bit or least significant bit and bit 7 (b7) is the high order bit or most significant bit of the byte. As the traditional modern computer is a byte addressable machine.

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The most important use for a byte is holding a character code. The bits in a byte are numbered from bit zero (b0) through seven (b7) as given follows:

b7

b6

b5

b4

b3

b2

b1

b0

Bit 0 (b0) is the low order bit or least significant bit and bit 7 (b7) is the high order bit or most significant bit of the byte.

As here we see that a byte contains exactly two nibbles where Bits b0 to b3 comprise the low order nibble and bits b4 through b7 form the high order nibble.

Since a byte contains exactly two nibbles, byte values require two hexadecimal digits.

As the traditional modern computer is a byte addressable machine, it turns out to be more efficient to manipulate a whole byte than an individual bit or nibble.

This is the reason that most programmers use a whole byte to represent data types that require no more than 256 items

Since a Byte contains eight bits, it can represent 28 or 256 different values because the maximum 8-bit binary number may by 1111 1111 that is equivalent to 256(Decimal) therefore generally a byte is used to represent the following:

 

  • unsigned numeric values in the range 0 to 255
  • signed numbers in the range -128 to +127
  • ASCII character codes
  • And other special data types requiring no more than 256 different values as many data types have fewer than 256 items so eight bits is usually sufficient.

Sample Chapters from book DATA RECOVERY WITH AND WITHOUT PROGRAMMING by Author Tarun Tyagi
Data Recovery with & without Programming


Publishers of the Book
Number of Pages
ISBN
Price of the Book


BPB Publications, New Delhi, India
540
81-7656-922-4
$69.00 (Including Shipping Charges, Cost of Book and Other expenses, Free Source Code CD included with the Book)





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