Program % If-Then-Else statementgt(X,Y) :- X >= Y,write('X is greater or equal').gt(X,Y) :- X Y,write('X is greater').gte(X,Y) :- X =:= Y,write('X and Y are same').gte(X,Y) :- X < Y,write('X is smaller'). Following is an example of decision making in Prolog. In some different programming languages, there are If-Else statements, but in Prolog we have to define our statements in some other manner. The basic usage is as follows − If is true, Then, Else So when we try to match some condition, and perform some task, then we use the decision making statements. The decision statements are If-Then-Else statements. compiling D:/TP Prolog/Sample_Codes/ for byte code.D:/TP Prolog/Sample_Codes/ compiled, 14 lines read - 1700 bytes written, 16 msyes| ?- count_down(12,17).5true ? 4true ? 3true ? 2true ? 1true ? 0yes| ?- count_up(5,12).10true ? 11true ? 12true ? 13true ? 14true ? 15true ? 16true ? 17yes| ?- Decision Making
count_up(L, H) :- between(L, H, Y), Z is L + Y, write(Z), nl. Let us see an example program − count_down(L, H) :- between(L, H, Y), Z is H - Y, write(Z), nl. So, we can use the between() to simulate loops. Now create a loop that takes lowest and highest values. The combined system enhances the expressive power of ASP. A signicant problem with this approach is that the number of frame axioms needed can be very large.
Consider a world with blocks having the setup shown in. compiling D:/TP Prolog/Sample_Codes/ for byte code.D:/TP Prolog/Sample_Codes/ compiled, 4 lines read - 751 bytes written, 16 ms(16 ms) yes| ?- count_to_10(3).345678910true ?yes| ?- We present a system (ASP ¡PROLOG) which provides a tight and well-deflned integration of Prolog and Answer Set Program- ming (ASP). Example: In our blocks world, we might have the axiom: If block A is put on block B, then the status of clear(X) does not change for any X different from B PROJECT: Frame axioms from frame axiom version of blocks world program 2. For this project we will only need a language having the / 2 constraint, meaning syntactic equality. Program count_to_10(10) :- write(10),nl.count_to_10(X) :- write(X),nl, Y is X + 1, count_to_10(Y). We have a Prolog module that performs the following activities: BULLET It takes (a) an answer set program representing the instance with the parameter length, and (b) a disjunctive goal. There are no direct loops in some other languages, but we can simulate loops with few different techniques. In general, for, while, do-while are loop constructs in programming languages (like Java, C, C++).Ĭode block is executed multiple times using recursive predicate logic.
#Prolog program for block world problem code
Loop statements are used to execute the code block multiple times. We also report the results obtained using Simo, Relsat, or zChaff.In this chapter, we will discuss loops and decision making in Prolog. Using the default SAT solver, namely mChaff. Of a SAT solver to compute answer sets-we run all experiments Stack(A, B) Execution of a plan: achieved through a data structure called Triangular Table. The ASP programs have been designed to be Plan for the block world problem For the given problem, Start Goal can be achieved by the following sequence : 1. (in some cases, we provide the code usable with General enough to be used on different platforms (using the library clpfd)-though the code is The CLP programs have been designed for execution by Ultimately, the work in this research isĮxpected to lay the ground for transfer of concepts between the Of their implementations and suggesting criteria for choosing oneĪpproach versus the other. Respond to different problems, highlighting strengths and weaknesses The objective is to identify how the solvers in the two domains Set Programming (ASP) and Constraint Logic Programming (CLP) In these pages we present experimental comparisons between declarativeĮncodings of various computationally hard problems in both Answer
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