Stack.Contains() Method in C# (original) (raw)
Last Updated : 04 Feb, 2019
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:
csharp `
// C# code to illustrate the // Stack.Contains() 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("Geeks");
myStack.Push("Geeks Classes");
myStack.Push("Noida");
myStack.Push("Data Structures");
myStack.Push("GeeksforGeeks");
// Checking whether the element is
// present in the Stack or not
// The function returns True if the
// element is present in the Stack,
// else returns False
Console.WriteLine(myStack.Contains("GeeksforGeeks"));
}
}
`
Example 2:
csharp `
// C# code to illustrate the // Stack.Contains() 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(5);
myStack.Push(10);
myStack.Push(15);
myStack.Push(20);
myStack.Push(25);
// Checking whether the element is
// present in the Stack or not
// The function returns True if the
// element is present in the Stack, else
// returns False
Console.WriteLine(myStack.Contains(7));
}
}
`
Reference: