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Stack.Peek() Method in C#
The Stack.Peek() method in C# is used to return the object at the top of the Stack without removing it.
Syntax
The syntax is as follows −
public virtual object Peek ();
Example
Let us now see an example −
using System; using System.Collections; public class Demo { public static void Main() { Stack stack = new Stack(); stack.Push("Inspiron"); stack.Push("Alienware"); stack.Push("Projectors"); stack.Push("Monitors"); stack.Push("XPS"); stack.Push("Laptop"); stack.Push("Notebook"); Console.WriteLine("Stack elements..."); foreach(string val in stack) { Console.WriteLine(val); } Console.WriteLine("Count of elements = "+stack.Count); Console.WriteLine("Element at the top = "+ stack.Peek()); stack.Push("Ultrabook"); stack.Push("Cameras"); stack.Push("Keyboards"); Console.WriteLine("
Stack elements...updated"); foreach(string val in stack) { Console.WriteLine(val); } Console.WriteLine("Element at the top = "+ stack.Peek()); Console.WriteLine("
Count of elements (updated) = "+stack.Count); stack.Clear(); Console.Write("Count of elements (updated) = "+stack.Count); } }
Output
This will produce the following output −
Stack elements... Notebook Laptop XPS Monitors Projectors Alienware Inspiron Count of elements = 7 Element at the top = Notebook Stack elements...updated Keyboards Cameras Ultrabook Notebook Laptop XPS Monitors Projectors Alienware Inspiron Element at the top = Keyboards Count of elements (updated) = 10 Count of elements (updated) = 0
Example
Let us now see another example −
using System; using System.Collections; public class Demo { public static void Main() { Stack stack = new Stack(); stack.Push("Inspiron"); stack.Push("Alienware"); stack.Push("Projectors"); stack.Push("Monitors"); stack.Push("XPS"); stack.Push("Laptop"); stack.Push("Notebook"); Console.WriteLine("Stack elements..."); foreach(string val in stack) { Console.WriteLine(val); } Console.WriteLine("Count of elements = "+stack.Count); Console.WriteLine("Element Speakers is the stack? = "+stack.Contains("Speakers")); stack.Push("Headphone"); stack.Push("Keyboard"); stack.Push("Earphone"); Console.WriteLine("
Stack elements...updated"); foreach(string val in stack) { Console.WriteLine(val); } Console.WriteLine("Count of elements (updated) = "+stack.Count); Console.WriteLine("Element Alienware is the stack? = "+stack.Contains("Alienware")); Stack stack2 = (Stack)stack.Clone(); Console.WriteLine("
Stack elements...cloned"); foreach(string val in stack2) { Console.WriteLine(val); } Console.Write("Count of elements (updated) = "+stack2.Count); Console.WriteLine("Top of the Stack = "+stack2.Peek()); } }
Output
This will produce the following output −
Stack elements... Notebook Laptop XPS Monitors Projectors Alienware Inspiron Count of elements = 7 Element at the top = Notebook Stack elements...updated Keyboards Cameras Ultrabook Notebook Laptop XPS Monitors Projectors Alienware Inspiron Element at the top = Keyboards Count of elements (updated) = 10 Count of elements (updated) = 0
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