By Morris Rubinoff, Marshall C. Yovits
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Extra info for Advances in Computers, Vol. 15
Thus it would seem that the information that (A B C D) results in output (D C B A) might be enough to indicate to a system that the reversal program is desired. The efforts of Shaw et al. (1975) and Hardy (1974) address this more difficult problem of synthesis. Because of the reduction in available information, such a system cannot use as simple a mechanism as described by Summers and must include many more heuristics (as defined in Section 6). For example, Shaw et al. (1975) discuss the problem of creating a program that yields (A B A C A D B C B D C D) from the input (A B C D).
If an error is observed in the test program’s behavior, it is necessary to change the synthesized program using the override feature. The override feature assumes that earlier traces do not correctly express the current desires of the programmer. Either the programmer has made an error in previous example calculations or he has changed his mind about what the program should do. Whatever the situation, this feature can be called while advancing through an example using the continue feature. If APPROACHES TO AUTOMATIC PROGRAMMING 25 the test program begins some action that does not agree with the user’s desire, he calls backup to undo the undesired action, then he calls override and inserts by hand whatever instructions he prefers, and finally, if appropriate, he can return to the use of continue to finish the calculation.
The process of building looping constructions using theorem proving techniques has been studied by Manna and Waldinger (1971) as well as others. The Manna and Waldinger approach requires that the theorem prover be able to execute a proof by induction and then it builds a program loop for each such induction. 14. Resolving to obtain the clause with only the Ans predicate. 34 ALAN W. 15. The resolved predicates and the substitutions made. Rules of inference in the following discussion will be written Hi, Hz.
Advances in Computers, Vol. 15 by Morris Rubinoff, Marshall C. Yovits