At the smallest range in the computer, details is stored together bits and also bytes. In this section, we"ll learn exactly how bits and also bytes encode information.

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## Bit

a "bit" is atomic: the smallest unit the storageA bit stores just a 0 or 1"In the computer it"s all 0"s and 1"s" ... BitsAnything v two different states have the right to store 1 bitIn a chip: electrical charge = 0/1In a hard drive: clues of North/South magnetism = 0/1A little is too little to be much useGroup 8 bits together to do 1 byteEverything in a computer system is 0"s and 1"s. The bit stores simply a 0 or 1: it"s the smallest structure block the storage.

## Byte

One byte = collection of 8 bitse.g. 0 1 0 1 1 0 1 0One byte have the right to store one character, e.g. "A" or "x" or "\$"

## How many Patterns with N Bits? (demo)

How numerous different patterns have the right to be made v 1, 2, or 3 bits?Number of bits different Patterns
1 0 1
2 00 01 10 11
3 000 001 010 011 100 101 110 111
3 bits vs. 2 bitsConsider simply the outward bitIt can only be 0 or 1Leftmost little bit is 0, climate append 2-bit patternsLeftmost little bit is 1, climate append 2-bit fads again3-bits has actually twice as many patterns as 2-bitsNumber of bits various Patterns
1 0 1
2 00 01 10 11
3 000 001 010 011 100 101 110 111
In general: include 1 bit, double the variety of patterns1 little bit - 2 patterns2 bits - 4 3 bits - 84 bits - 165 bits - 326 bits - 647 bits - 1288 bits - 256 - one byteMathematically: n bits yields 2n patterns (2 to the nth power)

## One Byte - 256 trends (demo)

1 byte is team of 8 bits8 bits deserve to make 256 various patternsHow to usage the 256 patterns?How to keep a number in a byte?Start with 0, walk up, one pattern per number, until run out of patterns0, 1, 2, 3, 4, 5, ... 254, 255One byte deserve to hold a number between 0 and also 255i.e. V 256 various patterns, we have the right to store a number in the selection 0..255 Really an excellent for save characters/letters.

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## Bytes

"Byte" - unit of info storageA document, one image, a movie .. How many bytes?1 byte is sufficient to hold around 1 typed character, e.g. "b" or "X" or "\$"All storage is measure in bytes, despite being very different hardwareKilobyte, KB, about 1 thousands bytesMegabyte, MB, around 1 million bytesGigabyte, GB, around 1 billion bytesTerabyte, TB, about 1 sunshine bytes (rare)

## Bytes and Characters - ASCII Code

ASCII is an encoding representing each typed character by a numberEach number is save in one byte (so the number is in 0..255)A is 65B is 66a is 96space is 32"Unicode" is one encoding because that mandarin, greek, arabic, etc. Languages, commonly 2-bytes every "character"
 32 space33 !34 "35 #36 \$37 %38 &39 "40 (41 )42 *43 +44 ,45 -46 .47 /48 049 150 251 352 453 554 655 756 857 958 :59 ;60 63 ?64 65 A66 B67 C68 D69 E70 F71 G72 H73 I74 J75 K76 L77 M78 N79 O80 P81 Q82 R83 S84 T85 U86 V87 W88 X89 Y90 Z91 <92 \93 >94 ^95 _96 ` 97 a98 b99 c100 d101 e102 f103 g104 h105 i106 j107 k108 l109 m110 n111 o112 p113 q114 r115 s116 t117 u118 v119 w120 x121 y122 z123 125 126 ~

## Typing, Bytes, and You

Each letter is save in a byte, together below100 typed letter takes increase 100 bytesWhen girlfriend send, say, a message message, the numbers room sentText is rather compact, using few bytes, compared to images etc.