/// <summary>
/// Removes the last entry from the Stack
/// If the stack is empty pop will return a default value
/// </summary>
/// <returns>deleted stack entry</returns>
public T Pop()
{
if (_currentElement != null)
{
T temp = _currentElement.ValueOfElement;
_currentElement = _currentElement.Successor;
return(temp);
}
else
{
throw new NullReferenceException(); //throw an exception becasue stack is entry
}
}
private StackElement <T> _currentElement; //stores the latest entry of the stack
/// <summary>
/// Adds new Elements to the stack
/// </summary>
/// <param name="item">item which should be added to the stack</param>
public void Push(T item)
{
if (_currentElement == null)
{
_currentElement = new StackElement <T>()
{
ValueOfElement = item, Successor = null
};
}
else
{
StackElement <T> temp = new StackElement <T>()
{
ValueOfElement = item, Successor = _currentElement
};
_currentElement = temp;
}
}