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