/// <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
}
}
public T Pop()
{
if (curEle != null)
{
T temp = curEle.ValueOfElement;
curEle = curEle.Successor;
return(temp);
}
else
{
throw new NullReferenceException();
}
}
public T Pop()
{
if (presentElement == null)
{
throw new NullReferenceException();
}
else
{
T temp = presentElement.Value;
presentElement = presentElement.Predecessor;
return(temp);
}
}
public void Push(T element)
{
if (presentElement == null)
{
presentElement = new StackElement <T>()
{
Value = element, Predecessor = null
};
}
else
{
StackElement <T> temp = new StackElement <T> {
Value = element, Predecessor = presentElement
};
presentElement = temp;
}
}
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) //if null I need to create a new StackElement first, no successor exists
{
currentElement = new StackElement <T>()
{
ValueOfElement = item, Successor = null
};
}
else
{
StackElement <T> temp = new StackElement <T>()
{
ValueOfElement = item, Successor = currentElement
}; //actual current element will become successor, temp will be the new current element
currentElement = temp;
}
}
public void Push(T item)
{
if (curEle == null)
{
curEle = new StackElement <T>()
{
ValueOfElement = item, Successor = null
};
}
else
{
StackElement <T> temp = new StackElement <T>()
{
ValueOfElement = item, Successor = curEle
};
curEle = temp;
}
}