public void Clear()
{
var currentElement = FirstElement;
FirstElement = null;
CustomStackElement nextElement;
while (currentElement.NextElement != null)
{
nextElement = currentElement.NextElement;
currentElement.NextElement = null;
currentElement = nextElement;
}
}
public void Push(object data)
{
if (IsEmpty())
{
FirstElement = new CustomStackElement();
FirstElement.Data = data;
}
else
{
var newElement = new CustomStackElement();
newElement.Data = data;
var currentElement = FirstElement;
while (currentElement.NextElement != null)
{
currentElement = currentElement.NextElement;
}
currentElement.NextElement = newElement;
}
}
public object Pop()
{
var currentElement = FirstElement;
object returnVal;
if (currentElement.NextElement != null)
{
while (currentElement.NextElement.NextElement != null)
{
currentElement = currentElement.NextElement;
}
returnVal = currentElement.NextElement.Data;
currentElement.NextElement = null;
}
else
{
returnVal = currentElement.Data;
FirstElement = null;
}
return(returnVal);
}
