using system;

class test

{

       static void f(params int[] args)

       {

              console.writeline("array contains {0} elements:",args.length);

              foreach(int i in args)

                     console.write("{0}",i);

              console.writeline();

       }

       public static void main()

       {

              int [] a = {1,2,3};

              f(a);

              f(10,20,30,40);

              f();

}

}