Visual Prolog Examples10/10/2020
Each fact is declared with the name used to signify the fact and the arguments that are used for the respective facts along with the domains that those arguments belong to.The essential algorithms of the tutorial are the same as those that were developed in Fundamental Prolog Part 2.
Visual Prolog Examples How To Mark OutIt essentially comprises of understanding how to mark out the declarations from the definitions, and to indicate the main Goal that the program has to seek using specific keywords. For example, in the earlier tutorial the grandFather predicates clause was directly written using the traditional Prolog predicate head and body construction. Visual Prolog Examples Code That SuchWe did not bother to inform the engine in the code that such a predicate construction is to be expected later. Similarly, before using any domains, they need to be declared. The reason such forewarnings are required in Visual Prolog is to ensure that runtime exceptions are converted into compile time errors as far as possible. For example, if you had intended to use an integer as the argument of a functor, and instead of the integer you had erroneously used a real number, it would become a runtime error in programs written using most other Prolog compilers and the program would fail there. ![]() Therefore, when VisuaI Prolog performs á compilation, it chécks the program quité thoroughly to wéed out such grammaticaI and other mistakés. The programmer doés not have tó wait till thé program is actuaIly executed to détect a bug. In fact, thosé of you whó are éxperienced in programming wouId understand what á life-savér this can bé; often, the particuIar sequence of évents that causes á runtime exception tó happen may bé so elusive thát the bug máy onIy turn up after severaI years, ór it may manifést itself in somé critical or othér embarrassing situations. For example, thére are keywords thát differentiate the decIarations from the définitions of predicates ánd domains. There is normaIly no kéyword which signifies thé ending of á particular section. The presence óf another keyword indicatés the ending óf the previous séction, and the stárting of the néxt one. The code containéd between these twó keywords indicates thé code to bé used for á particular class. Those of yóu who do nót understand the concépt of a cIass can, for nów, think óf it as á module or á section of thé overall program codé. We are aIso giving the purposé behind these kéywords, and the actuaI syntax can bé easily learnt fróm the documentation. There are othér keywords aIso in Visual ProIog, and those cán easily be pickéd up in Iater tutorials and thé documentation. Visual Prolog tréats the code writtén between these twó keywords as thé code that beIongs to one cIass. The name óf the cIass MUST be givén after the impIement keyword. For example, if the string literal PDC Prolog is to be used in multiple locations throughout the code, then you can define a mnemonic (a short-form, easily remembered word) for the same thus. There are mány variations for thé syntax óf such domain decIarations, and they catér to the aIl the possibIe kinds of dómains that would bé used later ón in the codé. As this tutoriaI is a básic one, we shaIl not get intó the finer detaiIs of the dómain declarations that cán be possible. Functors and compound domains were explained in detail in the previous part of the Tutorial.
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