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DECLARATIVE PROGRAMMING

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DECLARATIVE PROGRAMMING
Ivan Bratko
Faculty of Computer and Info. Sc.
University of Ljubljana
PROGRAMMING PARADIGMS,
COMPUTATION MODELS
 Programming paradigms ~ computation models
 Computation model = precise notion of “programming paradigm”
 A computation model is a formal system that defines how
computations are done
SOME COMPUTATION MODELS,
PROGRAMMING PARADIGMS
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Imperative programming
Declarative programming
Object-oriented programming
Functional programming
Logic programming
Relational programming
Constraint programming
Concurrent programming
Declarative concurrency
Message-passing concurrency
Shared-state concurrency
TWO DEFINITIONS
From Wikipedia
 According to one definition, a program is "declarative" if it describes
what something is like, rather than how to create it.
 This is a different approach from traditional imperative programming
languages such as Fortran, C, and Java, which require the
programmer to specify an algorithm to be run. In short, imperative
programs make the algorithm explicit and leave the goal implicit,
while declarative programs make the goal explicit and leave the
algorithm implicit.
SECOND DEFINITION
From Wikipedia
 According to a different definition, a program is "declarative" if it is
written in a functional programming language, logic programming
language, or constraint programming language.
 The phrase "declarative language" is sometimes used to describe all
such programming languages as a group, and to contrast them
against imperative languages.
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