Stack.Contains() Method in C#
This method(comes under System.Collections namespace) is used to check whether a specified element is present is Stack or not. Internally this method checks for equality by calling the Object.Equals method. Also, it performs a linear search, therefore, this method is an O(n) operation, where n is Count.
Syntax:
public virtual bool Contains (object obj);
Here, obj is the object to locate in the Stack. The value can be null.
Return Value: It returns true, if obj is found in the Stack otherwise returns false.
Below programs illustrate the use of above-discussed method:
Example 1:
using System;
using System.Collections;
class GFG {
public static void Main()
{
Stack myStack = new Stack();
myStack.Push( "Geeks" );
myStack.Push( "Geeks Classes" );
myStack.Push( "Noida" );
myStack.Push( "Data Structures" );
myStack.Push( "GeeksforGeeks" );
Console.WriteLine(myStack.Contains( "GeeksforGeeks" ));
}
}
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Example 2:
using System;
using System.Collections;
class GFG {
public static void Main()
{
Stack myStack = new Stack();
myStack.Push(5);
myStack.Push(10);
myStack.Push(15);
myStack.Push(20);
myStack.Push(25);
Console.WriteLine(myStack.Contains(7));
}
}
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Reference:
Last Updated :
04 Feb, 2019
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