Stack.Clear Method in C# (original) (raw)

Last Updated : 04 Feb, 2019

This method(comes under System.Collections namespace) is used to remove all the objects from the Stack. This method will set the Count of Stack to zero, and references to other objects from elements of the collection are also removed. This method is an O(n) operation, where n is Count.Syntax:

public virtual void Clear ();

Below programs illustrate the use of above-discussed method:Example 1:

csharp `

// C# code to illustrate the // Stack.Clear Method using System; using System.Collections;

class GFG {

// Driver code
public static void Main()
{

    // Creating a Stack
    Stack myStack = new Stack();

    // Inserting the elements into the Stack
    myStack.Push("1st Element");
    myStack.Push("2nd Element");
    myStack.Push("3rd Element");
    myStack.Push("4th Element");
    myStack.Push("5th Element");
    myStack.Push("6th Element");

    // Displaying the count of elements
    // contained in the Stack before
    // removing all the elements
    Console.Write("Total number of elements"+
                     " in the Stack are : ");

    Console.WriteLine(myStack.Count);

    // Removing all elements from Stack
    myStack.Clear();

    // Displaying the count of elements
    // contained in the Stack after
    // removing all the elements
    Console.Write("Total number of elements"+
                     " in the Stack are : ");

    Console.WriteLine(myStack.Count);
}

}

`

Output:

Total number of elements in the Stack are : 6 Total number of elements in the Stack are : 0

Example 2:

csharp `

// C# code to illustrate the // Stack.Clear Method using System; using System.Collections;

class GFG {

// Driver code
public static void Main()
{

    // Creating a Stack
    Stack myStack = new Stack();

    // Inserting the elements into the Stack
    myStack.Push(3);
    myStack.Push(5);
    myStack.Push(7);
    myStack.Push(9);
    myStack.Push(11);

    // Displaying the count of elements
    // contained in the Stack before
    // removing all the elements
    Console.Write("Total number of elements "+
                       "in the Stack are : ");

    Console.WriteLine(myStack.Count);

    // Removing all elements from Stack
    myStack.Clear();

    // Displaying the count of elements
    // contained in the Stack after
    // removing all the elements
    Console.Write("Total number of elements"+
                     " in the Stack are : ");

    Console.WriteLine(myStack.Count);
}

}

`

Output:

Total number of elements in the Stack are : 5 Total number of elements in the Stack are : 0

Reference:

• https://docs.microsoft.com/en-us/dotnet/api/system.collections.stack.clear?view=netframework-4.7.2

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