Data Representation PDF

## Data Representation All data on a computer system is represented using binary patterns, which are sequences of 1s and 0s. ### Data Types * **Numbers** - by converting * Integer * Float * **Texts ** - using char set * String * Char * **Image** - by pixalating * Vector...

## Data Representation All data on a computer system is represented using binary patterns, which are sequences of 1s and 0s. ### Data Types * **Numbers** - by converting * Integer * Float * **Texts ** - using char set * String * Char * **Image** - by pixalating * Vector * Bitmap * **Sound** - by sound sampling ### Numbers Data Numbers data are encoded into a binary format to store in memory. ### Representing Texts * Texts are encoded with the use of character set. * Character set is a group of codes that assign to a character using a unique bit pattern. * Character sets are ASCII, Extended ASCII and Unicode. * Character code refers to a single character code in a character set or code page. * A character can be any of the following: * Letters - (upper and lower case letters have separate codes) * Punctuation - (e.g. ?/|\£$) * Numbers - (0 to 9) * Non-printing commands - (e.g. Enter, Delete, F1) * **Character code for numeric digits:** When a denary digit (from 0 to 9) is processed as a character, the computer uses the binary pattern of its character code, instead of the binary representation of that digit. * **Bit-patterns** are a combination of 1s and 0s that are used to represent data. The number of bits used in a representation will affect the number of bit-patterns available. * **You can make four bit-patterns with 2 bits**: * 00 * 01 * 10 * 11 ### ASCII * ASCII stands for American Standard Code for Information Interchange. * ASCII uses 7-bits of codes that can represent 128 different characters. ASCII is only used for the English language. ### Extended ASCII * Extended ASCII code is an 8-bit character set that represents 256 different characters. Extended ASCII is useful for European languages.