C# Stack
The Stack represents a collection of last-in, first-out objects. Use the stack when you need last-in-first-out access to items. When you add an item to the list called a push element, when you remove an item from the list, itis called a pop-up element.
Methods and properties of the Stack class
The following table lists some common properties of Stack class:
Attribute |
Description |
|---|---|
Count |
Gets the number of elements contained in the Stack. |
The following table lists some common methods of Stack.
Serial number |
Method name & description |
|---|---|
1 |
Public virtual void Clear (); removes all elements from the Stack. |
2 |
Public virtual bool Contains (object obj); determines whether an element is in Stack. |
3 |
Public virtual object Peek (); returns the object at the top of the Stack without removing it. |
4 |
Public virtual object Pop (); removes and returns the object at the top of the Stack. |
5 |
Public virtual void Push (object obj); add an object to the top of the Stack. |
6 |
Public virtual object [] ToArray (); copy Stack into a new array. |
Example
The following example demonstrates the use of Stack:
Example
using System;
using System.Collections;
namespace CollectionsApplication
{
class Program
{
static void Main(string[] args)
{
Stack st = new Stack();
st.Push('A');
st.Push('M');
st.Push('G');
st.Push('W');
Console.WriteLine("Current stack: ");
foreach (char c in st)
{
Console.Write(c + " ");
}
Console.WriteLine();
st.Push('V');
st.Push('H');
Console.WriteLine("The next poppable value in stack: {0}",
st.Peek());
Console.WriteLine("Current stack: ");
foreach (char c in st)
{
Console.Write(c + " ");
}
Console.WriteLine();
Console.WriteLine("Removing values ");
st.Pop();
st.Pop();
st.Pop();
Console.WriteLine("Current stack: ");
foreach (char c in st)
{
Console.Write(c + " ");
}
}
}
}
When the above code is compiled and executed, it produces the following results:
Current stack:
W G M A
The next poppable value in stack: H
Current stack:
H V W G M A
Removing values
Current stack:
G M A