Stack.Peek Method in C#
Last Updated :
04 Feb, 2019
This method(comes under System.Collections namespace) is used to return the object at the top of the Stack without removing it. This method is similar to the Pop method, but Peek does not modify the Stack.
Syntax:
public virtual object Peek ();
Return Value: It returns the Object at the top of the Stack.
Exception: Calling Peek() method on empty stack will throw InvalidOperationException. So always check for elements in the stack before retrieving elements using the Peek() method.
Below given are some examples to understand the implementation in a better way.
Example 1:
using System;
using System.Collections;
class GFG {
public static void Main()
{
Stack myStack = new 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" );
Console.Write( "Total number of elements" +
" in the Stack are : " );
Console.WriteLine(myStack.Count);
Console.WriteLine( "Element at the top is : "
+ myStack.Peek());
Console.WriteLine( "Element at the top is : "
+ myStack.Peek());
Console.Write( "Total number of elements " +
"in the Stack are : " );
Console.WriteLine(myStack.Count);
}
}
|
Output:
Total number of elements in the Stack are : 6
Element at the top is : 6th Element
Element at the top is : 6th Element
Total number of elements in the Stack are : 6
Example 2:
using System;
using System.Collections;
class GFG {
public static void Main()
{
Stack myStack = new Stack();
Console.WriteLine( "Element at the top is : "
+ myStack.Peek());
}
}
|
Runtime Error:
Unhandled Exception:
System.InvalidOperationException: Stack empty.
Reference:
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