C# |如何创建堆栈

原文:https://www . geeksforgeeks . org/c-sharp-如何创建堆栈/

Stack()构造函数用于初始化 Stack 类的一个新实例，该实例将为空，并具有默认的初始容量。堆栈代表后进先出的对象集合。当您需要后进先出访问项目时，可以使用它。当您在列表中添加一个项目时，它被称为推送项目，当您删除它时，它被称为弹出项目。这个类属于System.Collections 命名空间。

语法:

public Stack ();

要点:

  • The number of elements that can be accommodated in a stack is called stack capacity. If the element is to be added to the stack, the capacity will be automatically increased by reallocating the internal array.
  • If the size of the collection can be estimated, specifying the initial capacity will eliminate the need to perform a large number of resizing operations when adding elements to the stack.
  • This constructor is an O(1) operation.

例 1:

// C# Program to illustrate how
// to create a Stack
using 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);
    }
}

输出:

0

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