DataStructuresCSharp/C#/Datastructures/Stack/Stack.cs

64 lines
1.5 KiB
C#

namespace C_.Datastructures.Stack
{
public class Stack<T>
{
internal StackNode<T>? Head { get; set; }
private int Count { get; set; } = 0;
public static Stack<T> Create()
{
//Create a new stack without a head
return new Stack<T>();
}
public static Stack<T> Create(T? value)
{
//Create a new Stack with a head
return new Stack<T>
{
Head = StackNode<T>.Create(value, default),
Count = 1
};
}
public void Push(T? value)
{
//Add an Item to the top of the stack
Count++;
Head = StackNode<T>.Create(value, Head);
return;
}
public T? Pop()
{
//Take the item off of the top of the stack
T? value = default;
if (Count > 0)
{//Assign the default value if there are any items left in the stack
Count--;
value = Head!.Value;
Head = Head.Next;
if (Count == 0)
{
Head = default;
}
}
return value;
}
public T? Peek()
{
//View item on top of the stack
if (Count > 0)
{
return Head!.Value;
}
return default;
}
public int GetCount()
{//Return the number of items in the list
return Count;
}
}
}