EECS 1520 Lecture Notes - Lecture 2: Extended Ascii, Miscellaneous Symbols, Compression Ratio

• School: York University
• Department: Electrical Engineering and Computer Science
• Course: EECS 1520
• Professor: Steven Castellucci

Document Summary

Need to represent every character in a document. List term all & assign each a binary string. Character set is a list of characters & codes used to represent each one. Experts in tech industry agree on specifics of a character set, thereby creating a standard of sharing data. Ascii originally used seven bits to represent each character, allowing 128 unique characters later extended ascii evolved so that all eight bits were used represent lines, symbols, and letters with accents. Ascii character set organization first 32 are control characters (or hidden characters); they control how test appears, but do not appear as text. Decimal arabic numbers (i. e. , 0,1,2, etc. ) start at code 48 i. e. the code for 6 is 48+6 = 54. Unicode character set even the extended ascii is not enough for international use. Unicode uses 16 bits per character and can represent 216 or 65 thousand characters (unicode. org)