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18 Cards in this Set
- Front
- Back
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Turing Complete
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6 simple primitives are sufficient to compute anything that's computable (and, anything you can compute in one programming language, you can compute in another programming language)
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fixed program computer
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designed to compute precisely one computation such as a square root or the trajectory of a missle
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stored program computer
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can run any computation by interpreting a sequence of program instructions that are read into it
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what are some common primitive constructs?
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numbers (123), strings(abc), and simple operators(+-=)
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Syntax determines whether a string is _________.
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legal
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Static semantics determine _____________.
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whether a string has meaning
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What assigns meaning to a legal sentence?
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semantics
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compiled language
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abstractions are checked and then converted back into low level code
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What is the function of a computer's compiler?
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The compiler converts a checked sequence of instructions and converts it back into "basic computer instructions". (They are then run through an interpreter, which executes the actual process.)
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What is an interpreted programming language?
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A special converter changes the source code to match the internal data structure. The interpreter sequentially convert each individual step into low level machine instruction and executes the step.
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definition
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a python object that is evaluated and stored away
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command
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a python object (part of the script/program) that is executed by the Python interpreter in a shell
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How is a command interpreted?
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A command can 1) be typed directly into a shell or 2) stored in a file that's read into the shell and evaluated
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Scalar Data Object
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cannot be subdivided (programs can't subdivide scalar data objects)
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Nonscalar Data Object
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A data object that has an internal data structure that can be accessed.
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3 kinds of Scalar objects
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1) integers
2) floats (used to represent real numbers, such as with decimals) 3) boolean (True or False) |
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What is the simple expression syntax?
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<object> <operation> <object>
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shell
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a program that covers up the details of the operating system and just lets us interact with things.
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