A computer can only store and manipulate 0’s and 1’s . All data that is passed through the system must be represented as 0’s and 1’s.
A bit can store a 0 or a 1.
Given n bits we can represent 2n different values.
A byte is a sequence of 8 bits.
A byte can hold 256 distinct values: from 00000000 to 11111111.
Representing Unsigned Decimal Values
- Count to 20 in binary
- Binary – Decimal
- Binary – Hexadecimal
- ASCII = American Standard Code for Information Interchange
- Created by IANA
- Characters in .txt file stored as single bytes.
- The most recent version of Unicode contains 136,755 different characters for 139 scripts.
- Unicode uses up to 4 bytes per character.
- The first 127 Unicode characters are the ASCII characters.