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How to use Stack class in C#?
Stack class is used in C# to represent last-in, first out collection of object. It is used when you want the last added element to be removed first, for example, stack of books.
The following are the methods of Stack class −
| Sr.No | Method & 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 the 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); Inserts an object at the top of the Stack. |
| 6 | public virtual object[] ToArray(); Copies the Stack to a new array. |
The following is the property of Stack class: Count: Gets the number of elements in the stack.
Here is an example showing how to work with Stack class and its Push() and Pop() method −
Example
using System;
using System.Collections;
namespace CollectionsApplication {
class Program {
static void Main(string[] args) {
Stack st = new Stack();
st.Push('A');
st.Push('B');
st.Push('C');
st.Push('D');
Console.WriteLine("Current stack: ");
foreach (char c in st) {
Console.Write(c + " ");
}
Console.WriteLine();
st.Push('P');
st.Push('Q');
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 + " ");
}
}
}
}Output
Current stack: D C B A The next poppable value in stack: Q Current stack: Q P D C B A Removing values.... Current stack: C B A
Updated on: 20-Jun-2020
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