C# | How to create a Stack - GeeksforGeeks

18 Feb, 2019
Stack() constructor is used to initialize a new instance of the Stack class which will be empty and will have the default initial capacity. Stack represents a last-in, first out collection of object. It is used when you need last-in, first-out access to items. When you add an item in the list, it is called pushing the item and when you remove it, it is called popping the item. This class comes under System.Collections namespace.
Syntax:
public Stack ();
Important Points:
The number of elements that a Stack can hold is known as the Capacity of the Stack. If the elements will be added to the Stack then capacity will be automatically increased by reallocating the internal array.
Specifying the initial capacity will eliminate the requirement to perform a number of resizing operations while adding elements to the Stack if the size of the collection can be estimated.
This constructor is an O(1) operation.
Example 1:
// C# Program to illustrate how// to create a Stackusing System;using System.Collections;  class Geeks {      // Main Method    public static void Main(String[] args)    {          // st is the Stack object        // Stack() is the constructor        // used to initializes a new        // instance of the Stack class        Stack st = new Stack();           // Count property is used to get the        // number of elements in Stack        // It will give 0 as no elements        // are present currently        Console.WriteLine(st.Count);    }}
0

Example 2:
// C# Program to illustrate how// to create a Stackusing System;using System.Collections;  class Geeks {      // Main Method    public static void Main(String[] args)    {          // st is the Stack object        // Stack() is the constructor        // used to initializes a new        // instance of the Stack class        Stack st = new Stack();           Console.Write("Before Push Method: ");                  // Count property is used to get the        // number of elements in Stack        // It will give 0 as no elements        // are present currently        Console.WriteLine(st.Count);          // Inserting the elements         // into the Stack        st.Push("Chandigarh");        st.Push("Delhi");        st.Push("Noida");        st.Push("Himachal");        st.Push("Punjab");        st.Push("Jammu");          Console.Write("After Push Method: ");                  // Count property is used to get the        // number of elements in st        Console.WriteLine(st.Count);    }}
Before Push Method: 0
After Push Method: 6

Reference:
https://docs.microsoft.com/en-us/dotnet/api/system.collections.stack.-ctor?view=netframework-4.7.2#System_Collections_Stack__ctor
CSharp-Collections-Namespace
CSharp-Collections-Stack
C#
Writing code in comment?
Please use ide.geeksforgeeks.org,
generate link and share the link here.
Comments
Old Comments
Difference between Abstract Class and Interface in C#
C# | IsNullOrEmpty() Method
C# | Class and Object
C# Dictionary with examples
C# | Method Overriding
C# | Constructors
String.Split() Method in C# with Examples
C# | Arrays of Strings
Difference between Ref and Out keywords in C#
C# | How to check whether a List contains a specified element