CSE 101 Lecture Notes - Lecture 3: Positional Notation, Digital Data, 5,6,7,8
29 Jun 2016
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Document Summary
Computers are multimedia devices dealing with a vast array of information categories. Information is data (basic values, facts) that has been organized or processed into useful forms. Analog data: a continuous representation, analogous to the actual information it represents. Digital data: a discrete representation that breaks the information up into separate elements. The modern western style and some other styles of writing numbers use positional notation. The position of a digit determines how much it contributes to the number"s value. With decimal (base 10), place-values are powers of 10: 1000s, 100s, 10s, 1s, 1/10s, 1/100s, 1/100s, 1/1000s . 642. 15 means (6 x 102) + (4 x 101) + (2 x 100) + (1 x 10-1) + (5 x 10-2) Early computers used base 10 to represent numbers, but it was too unreliable as it was difficult to represent 10 distinct voltages for the 10 digits. The word bit is short for binary digit .
