HelloWorld.java

package com.declarativa.interprolog.examples;
import com.declarativa.interprolog.*;
import com.xsb.interprolog.*;
public class HelloWorld{
        public static void main(String args[]) {
                PrologEngine engine = new NativeEngine(args[0]);
                engine.command("import append/3 from basics");
                Object[] bindings = engine.deterministicGoal(
                        "name(User,UL),append(\"Hello,\", UL, ML), name(Message,ML)",
                        "[string(User)]",
                        new Object[]{System.getProperty("user.name")},
                        "[string(Message)]");
                String message = (String)bindings[0];
                System.out.println("\nMessage:"+message);
                // the above demonstrates object passing both ways; 
                // since we may simply concatenate strings, an alternative coding would be:
                bindings = engine.deterministicGoal(
                        "name('"+System.getProperty("user.name")+"',UL),append(\"Hello,\", UL, ML), name(Message,ML)",
                        "[string(Message)]");
                // (notice the ' surrounding the user name, unnecessary in the first case)
                System.out.println("Same:"+bindings[0]);
                System.exit(0);
        }
}

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