CS100 Lecture Notes - Lecture 11: Discretization, Extended Ascii
27 Jan 2019
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Document Summary
Discrete (digital) vs continuous (analog: discrete no in-between numbers, continuous infinite amount of numbers (between numbers are infinite) Discretization (digitization) make a continuous info discrete to reduce amount of info given and make it more convenient. Computers have a natural tendency to digitize (discrete) everything. In a computer, lets assume a light bulb, 0 = off, 1 = on. Billions of switches in the computer, they are for logic and memory. Bit binary digit, byte = 8 bits. 0 1 2 3 4 5 6 7 8 9 a b c d e f. 3 x 256 + 10 (a) x 16 + 14 (e) x 1 = 942. Ascii american standard code for information interchange. System going back and forth from characters to numbers. Semantic meaning of words is entirely in software, hardware only understands numbers. 128 additional characters such as ebar or letters with accents.
