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Stack in C#

In this article, we will learn about the stack class in C#.

A stack represents a variable size last-in-first-out (LIFO) collection of instances of the same specified type.

Three main operations can be performed on a stack and its elements: <ul><li>Push inserts an element at the top of the Stack.</li> <li>Pop removes an element from the top of the Stack.</li> <li>Peek returns an element that is at the top of the Stack but does not remove it from the Stack.<li> </ul> <h4>Creating a Stack</h4> <p>We create a Stack in C# using the following syntax:
Stack<T> st = new Stack<T>();
<T> here denotes any datatype which we want to create a stack of.


Properties of Stack

  • Count: This property gets the number of elements present in the stack.

Methods of Stack

  • Push(T): Inserts an object at the top of the Stack.</li>
  • Pop(): Removes and returns the object at the top of the Stack.</li>
  • Peek(): Returns the object at the top of the Stack without removing it.</li>
  • Contains(T): Determines whether an element is in the Stack.</li>
  • Clear(): Removes all objects from the Stack.</li> </ul>

    Stack Operation Examples:

    Different Stack operations are demonstrated in the example below:

    using System;
    using System.Collections.Generic;
    namespace StackDemo {
        class Example {
            static void Main(string[] args) {
                Stack  st = new Stack ();
                st.Push(5);          
                st.Push(5);
                st.Push(2);
                st.Push(9);
                
                Console.WriteLine(st.Count);        // Prints 4, the size of stack
                
                Console.WriteLine(st.Peek());       // Prints 9, the top element
                
                Console.WriteLine(st.Pop());       // Prints 9, then removes it
                Console.WriteLine(st.Pop());       // Prints 2, then removes it
                
                Console.WriteLine(st.Contains(5));  // Checks if 5 is present
                Console.WriteLine(st.Contains(2));  // Checks if 2 is present
            }
        }
    }
    </code></pre>
    

    Output:

    4
    9
    9
    2
    True
    False

    Task

    In the editor below, perform the different tasks as directed.

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