Udemy: Master Coding Interview - Stacks + Queues - #114

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using System; public class Node { public Node next; public string value; public Node(string value) { this.value = value; } } class Stack { Node top; Node bottom; int length = 0; static void Main() { Console.WriteLine("Hello World!"); Stack myStack = new Stack(); Console.WriteLine("myStack: " + myStack.ToString()); myStack.Push("Discord"); Console.WriteLine("myStack: " + myStack.ToString()); myStack.Push("Udemy"); Console.WriteLine("myStack: " + myStack.ToString()); myStack.Push("Google"); Console.WriteLine("myStack: " + myStack.ToString()); Console.WriteLine("myStack.Peek(): " + myStack.Peek()); Console.WriteLine("myStack: " + myStack.ToString()); myStack.Pop(); Console.WriteLine("myStack: " + myStack.ToString()); myStack.Pop(); Console.WriteLine("myStack: " + myStack.ToString()); myStack.Pop(); Console.WriteLine("myStack: " + myStack.ToString()); } public void Push(string value) { Node item = new Node(value); if (this.length == 0) { this.bottom = item; } if (this.top != null) { item.next = this.top; } this.length++; this.top = item; } public string Pop() { if (this.top != null) { string value = this.top.value; this.top = this.top.next; this.length--; return value; } return null; } public string Peek() { if (this.top != null) { return this.top.value; } return null; } public string ToString() { string s = "{"; Node current = this.top; int count = 0; while (current != null) { if (count > 0) { s += ", "; } count++; s += "" + current.value; current = current.next; } s += "}"; return s; } }
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