CMPT 115 Lecture Notes - Lecture 1: Computer, Goback, Abbreviation
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Notes written by michael horsch, mark eramian, ian mcquillan, lingling jin, and dmytro dyachuk. Abstraction is the process of extracting or distilling the underlying essence or important properties of a concept, removing some or all dependence on real world objects with which it might originally have been connected. Example: bits: information is represented electronically in a computer by voltages, at di erent levels, if the voltage is high , a computer interprets this as a 1 . If the voltage is low , then a computer interprets this as a 0 : however, voltage is measured on a continuous scale, not just in two distinct states. Output: sorted array void sort(int a[], int size) // code omitted for brevity load 01246 store 01242 load 01242 compare 0 jump 88762. Building abstraction hierarchies: when we have some abstraction, we can build another abstraction on it, the new abstraction is at a higher level of abstraction, example: natural sciences.
