The existing semantics of CUT in PROLOG are reviewed, and problems arising in connection with CUT in the implementation of the Warren Abstract Machine are addressed. CUT in PROLOG is a simple nonlogical built in predicate controlling backtracking....
This operation is used quite often in Prolog programs, both for efficiency and semantic preservation. However, its use after a call to an externally defined predicate can have undesired effects. For example, if we have a pending connection to another application, or if we have memory blocks ...
4)cut[英][k?t][美][k?t]截断 1.Visual Prolog provides an inner predicate-cutpredicate that can prevent Visual Prolog from backtracking.Visual Prolog提供的内部谓词-截断谓词“!”可以用来阻止回溯,而且从某种意义上讲,只有学会了截断谓词的使用,才能自由驾驭Prolog。 5)truncate[英][tr??'ke?t][美]...
Visual Prolog provides an inner predicate-cutpredicate that can prevent Visual Prolog from backtracking. Visual Prolog提供的内部谓词-截断谓词“!”可以用来阻止回溯,而且从某种意义上讲,只有学会了截断谓词的使用,才能自由驾驭Prolog。 更多例句>> 补充资料:定风波 商角调 商角调 西江客舍 ...
We cannot ensure that the goal cry_fly(penguins) will always fail? So, we are going to change the predicate can_fly definition in this approach as follows:can_fly(penguins) :- fail. can_fly(A) :- bird(A). However, the desired result is not provided by the above:?- can_fly(...
PROLOG语言谓词Cut程序终止性PROLOG语言中引进了cut这一重要的内部谓词(built-in predicate).使用cut可以方便地表达出过程性语义中不可缺少的控制结构——选择和循环.并且,cut还有利于提高程序的效率——加快运行速度和节省存储空间.但是,cut并不是原来一阶逻辑意义下纯粹的谓词,因而它的出现改变了原有程序的逻辑语义—...
This operation is used quite often in Prolog programs, both for efficiency and semantic preservation. However, its use after a call to an externally defined predicate can have undesired effects. For example, if we have a pending connection to another application, or if we have memory blocks ...