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Lecture 11

# CS100 Lecture Notes - Lecture 11: Discretization, Extended Ascii

Department
Computer Science
Course Code
CS100
Professor
Alexandra Boutros
Lecture
11

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Module 6
6.1
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
6.2 bit of memory
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
NOT opposite of what we want
6.3 how to count in binary
Decimal number system (10 based system)
^ 0 1 2 3 4 5 6 7 8 9
207 ------------------------
7 = 7 ones
0 = 0 tens”
2 = 2 hundreds”