C#

public NumberSolver(int result, ArrayList numbers)
{
   this.result = result;
   this.numbers = numbers;
   functions = new ArrayList();

   functions.Add( new FunctionHandler( this.Add ));
   functions.Add( new FunctionHandler( this.Subtract ));
   functions.Add( new FunctionHandler( this.Multiply ));
   functions.Add( new FunctionHandler( this.Divide ));
   functions.Add( new FunctionHandler( this.Power ));
}
...
public delegate int FunctionHandler(int a, int b);
...
//in some method, not clear now ;P
int output = numbers[0];
for (int i = 0; i < functions.Count; i++)
{
   FunctionHandler func = (FunctionHandler) functions[i];
   output = func(output, numbers[i + 1]);
}
return output; 

static TreeNodeCollection MakeNodes(string[] names)
{
  TreeNodeCollection nodes = new TreeNodeCollection();
  foreach (string name in names)
  {
     nodes.Add(name);
  }
  return nodes;
}

static void AddNodes(TreeNode parent, string[] names)
{
  foreach (string name in names)
  {
    parent.Nodes.Add(name);
  }
}

Not everything that can be counted counts, and not everything that counts can be counted. - Albert Einstein