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#1
September 29th, 2002, 04:50 PM
 php_rocks
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bits, bytes, etc...

hey,

i am just starting C programming.... and i am having trouble with all this bits and bytes and the range of types and such...

if someone could help me understand what bits are and how they apply to C programming i would appreciate it

-sean
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#2
September 30th, 2002, 12:23 PM
 MJEggertson
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A bit is a singular binary value. That is, one bit is either 0 or 1. On or off. True or false. Ying or yang... So a bit is the smallest possible data unit for a computer.

A byte is a collection of eight bits. Since one bit can hold 2 values, a byte can hold 2^8 = 256 values, from 00000000 to 11111111 if you use the traditional 0/1 numeric representation.

That's pretty much it. It isn't really anything specific about C, bits/bytes/etc are really just general computing names.

#3
September 30th, 2002, 09:24 PM
 Optix
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Yeah, and if you want to compare bits you can use bitwise operators. Such as lets say we want 0000 1111 and we want to mask it with 0101 1111 you can use hex and say that 1111 = 15 which equals F and 0101 = 5 so we can have

0x5F & 0x0F

would compare the bits.

EX.

0101 1111
&0000 1111
0101 1111

Sorry if this confuses you lol but its kinda hard to explain. There is another post about this question try searching for it its called "Bitwise Operators".

Anyways, Hope this helped a lil bit

PS: Oh yea if you are asking why you would need to do this, i have no clue but whatever.

#4
October 1st, 2002, 02:05 AM
 Scorpions4ever
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>>0101 1111
>>&0000 1111
>>---------------------
>> 0101 1111

Optix, that's not a bitwise and operation you have described there. That's a bitwise or operation 0x5F & 0x0F = 0x0F

#5
October 1st, 2002, 04:18 PM
 Optix
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oh oops

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