public class ListAdd {


    public static void main(String[] args) {
	reportSum(createVector(args));
	reportSum(createVector2(args));
    }

        
    public static MyVector createVector(String[] args) {
	MyVector v;
	if (args.length > 0) {
	    v = new MyVector(new Integer(args[0]),null);
	    for (int i = 1; i < args.length ; i++) {
		MyVector head=v;
		while(head.getNext() != null) 
		    head = head.getNext();
		head.setNext(new MyVector(
			 new Integer(args[i]),null));
	    }
	}
	else 
	    v=null;
	return v;
    }


    public static MyVector createVector2(String[] args) {
	MyVector v;
	if (args.length > 0) {
	    v = new MyVector(new Integer(args[0]),null);
	    for (int i = 1; i < args.length ; i++)
		insertLast(new Integer(args[i]),v);
	}
	else 
	    v=null;
	return v;
    }

    



    public static void insertLast(Integer i,MyVector v) {
	if (v.getNext()==null) 
	    v.setNext(new MyVector(i,null));
	else {
	    MyVector rem = v.getNext(); // get tail
	    insertLast(i,rem); 
	}
    }

    public static void printVector(MyVector v) {
	System.out.println(myVectorToString(v));
    }
    
    public static String myVectorToString(MyVector v) {
	MyVector head=v;
       	String s = "{"+head;
	while (head != null) {
	    head = head.getNext();
	    if (head != null) {
		s+=",";
		s+=head;
	    }
	}
	s+="}";
	return s;
    }

    public static void reportSum(MyVector v) {
	System.out.println();
	System.out.print("Vector "+myVectorToString(v)+" ");
	System.out.print("has sum "+addVector(v)+".");
	System.out.println();
    }

    public static int addVector(MyVector v) { 
	if (v==null) return 0;
	else return v.toValue()+addVector(v.getNext());
    }
    
}