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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク predicative programming ： ウィキペディア英語版 predicative programming Predicative programming is a methodology for program specification and refinement. The central idea of predicative programming is that each specification is a predicate (generally written as a boolean expression) that is true of acceptable behaviours and false of unacceptable behaviours. It follows that refinement is reversed implication universally quantified over behaviours: :$(P\backslash sqsubseteq\; Q)\backslash equiv\; (\backslash forall\; b\backslash cdot\; Q\backslash Rightarrow\; P)$ Commands in a programming language are considered to be a special case of specifications—special only because they are compilable. For example in an environment where the program variables are $x$, $y$, and $z$, the command $x:=y+1\backslash ,\backslash !$ is considered equivalent to the predicate (represented here by a boolean expression) :$x\text{'}\; =\; y+1\; \backslash land\; y\text{'}=y\; \backslash land\; z\text{'}=z$ in which $x$, $y$, and $z$ represent the initial values of the program variables and $x\text{'}$, $y\text{'}$, and $z\text{'}$ represent the final values of the program variables. Thus :$x\text{'}\; >\; y\; \backslash sqsubseteq\; x\; :=\; y+1$ == Bibliography == * E.C.R. Hehner, ''a Practical Theory of Programming'', Springer-Verlag 1993. Most recent edition online at (a Practical Theory of Programming ). 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「predicative programming」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.