By Morris Rubinoff, Marshall C. Yovits

ISBN-10: 0120121158

ISBN-13: 9780120121151

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The program synthesizer could attempt to do its job by enumerating the set of all possible programs in the language in order of increasing length, testing each one to see if it is capable of the desired behavior. When it finds such a program, it prints it out as its answer and halts. We know that the correct answer will exist somewhere in the enumeration so that it will be found eventually. But this strategy has a severe pitfall because it is not possible to tell for an arbitrary program whether or not it can produce the desired behavior.

A set of intermediate specifications Q are determined and the two problems I { A1) Q and Q { A2)G are attacked separately. Buchanan (1974) and Buchanan and Luckham (1974) have built a program synthesis system using the problem reduction approach. Their system has many resemblances to the STRIPS system described in Fikes and Nilsson (1971). The Buchanan and Luckham approach assumes that the system has a large amount of programming knowledge in the form of inference rules such as those shown in Fig.

Furthermore, it assumes that all previous traces are incorrect at the point where they imply the offending transition. Therefore, it deletes the incorrect transition both from the synthesized program and from all previous traces. 5 Synthesis of LISP Programs The synthesis of LISP programs from input-output examples provides an attractive problem for research partly because the L‘trace”of the calculation is often easy to obtain. Thus if the input X = (A B C) yields output Y = (C B A), one suspects that the output was obtained by placing the leftmost element of X into the rightmost location of Y, the second element of X into the second location of Y, and the rightmost element of X into the first position of Y.

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Advances in Computers, Vol. 15 by Morris Rubinoff, Marshall C. Yovits

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