import edu.neu.ccs.demeterf.*;
import java.util.Arrays;

class Q{
    S s; R r[];
    Q(S ss, R rr[]){ s = ss; r = rr; }
}
class T{}
class R extends T{ Integer i;
  R(Integer ii) { i=ii;}}
class S extends T{ Integer i;
  S(Integer ii) { i=ii;}}

class ToFloat extends ID{
    // fold the array
    Float apply(Float[] s){ 
	      Float sum = 0.0f;
              for (Float item : s) {
	        sum=sum + new Float(item);
              };
	      return sum; }
    Float combine(S s){ return new Float(s.i); }
    Float combine(R s){ return new Float(s.i); }
    Float combine(Q q, Float s, Float r){ return new Float(s+r); }
}

public class ArrayTest {
    static void p(String s){ System.out.println(s); }
    public static void main(String args[]){
        R r = new R(7);
        Q q = new Q(new S(5), new R[]{r,r,r,r});

        Traversal t = new Traversal(new ToFloat());

        p(" Returned: "+t.traverse(q));
        // Prints " Returned: 33.0 "

        p(" Returned 2: "+t.traverse(new T[]{r, new S(5), r, new S(5)}));
        // Prints " Returned 2: 24.0 "
    }
}