Hi, I'm new to Jess, and sadly not too good in java, I have read posts about
this topic, but just couldn't find what could be wrong with my code.:-(
This application should pass input from java to jess to evaluate circuit
gates, then pass the result back to java. (school project)
Jess file:
(deffunction AND(?a ?b)
(if (or (= ?a 0)(= ?b 0))then (return 0)else (return 1)))
(deffunction OR(?a ?b)
(if (and (= ?a 0) (= ?b 0))then (return 0)else (return 1)))
(deffunction NOT(?x)
(if (= ?x 1)then (return 0)else (return 1)))
(deffunction XOR(?a ?b)
(if (<> ?a ?b) then (return 1)else (return 0)))
(reset)
Java code:
import jess.*;
public class MainCircuit {
public static void main(String[] argv)throws JessException,
java.io.IOException{
int a=1,b=0,c=1;
try
{
Rete engine = new Rete();
engine.clear();
engine.batch("Circuit evaluator.clp");
engine.store("A", new jess.Value(a));
engine.executeCommand("(bind ?x (fetch(A)))");
engine.store("B", new jess.Value(b));
engine.executeCommand("(bind ?y (fetch(b)))");
engine.store("C", new jess.Value(c));
engine.executeCommand("(bind ?z (fetch(c)))");
Value d = engine.executeCommand("(NOT (OR (AND ?y ?z) ?x))");
Value e = engine.executeCommand("(AND (XOR ?x ?z) ?y)");
System.out.println("The given circuit's Output values are :
");
System.out.println(d.intValue(engine.getGlobalContext()));
System.out.println(e.intValue(engine.getGlobalContext()));
}
catch (JessException ex)
{
System.err.println(ex);
}
}
}
Error msg:
Jess reported an error in routine Funcall.execute
while executing (A)
while executing (fetch (A))
while executing (bind ?x (fetch (A))).
Message: Undefined function A.
Program text: ( bind ?x ( fetch ( A ) ) ) at line 1 in file <eval pipe>.
Sry if it's stupid ... and thanks in advance if you answer!
Tessa
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