COMP 1405 Lecture Notes - Lecture 3: Substitution Cipher
17 Oct 2016
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Central processing unit (cpu: control unit (cu, arithmetic/logic unit (alu, registers. Alphabet: standard set of symbols for communicating: real life example: numeral system (why are there 10 numbers/symbols?) Understanding computer architecture will clarify operations of computer memory. Internal circuitry components also carry either high voltage or low voltage at a given point. Region can only story one of two possibilities: possibilities represented by the symbols of the only alphabet the computer truly uses the binary alphabet (0 and 1) Given a sequence of digits, count by replacing the current right most digit with the next digit. Digits of the hexadecimal number system: 0, 1, 2, 3, 4, 5, 6, 8, 9, a, b, c, d, e, f. Alphabet that has more than 10 symbols. Given a sequence of digits, count by replacing the current rightmost digit with the next digit.
