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adsep: start algorithms + data structs = programs.

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Kyle Isom 2018-04-10 07:08:48 -07:00
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# Fundamental Data Structures
+ information to be processed: *abstraction* of some part of the real
world
+ computer has a selected set of *data* about the real world
+ this data is an abstraction:
+ certain properties/characteristics of the real world are ignored
because they are considered peripheral to the problem
+ therefore represents a simplification of facts
+ problem solving: defining the set of characteristics relevant to the
problem
+ the *choice of representation* may involve several levels of detail:
consider deciding the position of an object.
+ polar v. cartesian coordinates (and selection of origin)
+ floating point v. integer representation of coordinates
## The concept of data type
+ in maths, we have different types: whole, integer, rational, etc...
+ principle: *every constant, variable, expression, or function is of
a certain data type*
+ adherence to this means the compiler can check constructs for
legality and compatibility
+ programming languages provide base data types, which can be extended
by the programmer
+ *cardinality*: the number of distinct values belonging to some type
*T*