C#-এ Stack.Pop() মেথডটি Stack-এর উপরের (top) এলিমেন্টটি সরিয়ে ফেলে এবং সেই এলিমেন্টটি রিটার্ন করে। Stack LIFO (Last In, First Out) নীতিতে কাজ করে।
সিনট্যাক্স (Syntax)
public virtual object Pop ();
উদাহরণ ১: স্ট্রিং Stack-এ Pop() ব্যবহার
using System;
using System.Collections;
public class Demo {
public static void Main() {
Stack stack = new Stack();
stack.Push("Inspiron");
stack.Push("Alienware");
stack.Push("Projectors");
stack.Push("Monitors");
stack.Push("XPS");
stack.Push("Laptop");
stack.Push("Notebook");
Console.WriteLine("Stack elements...");
foreach(string val in stack) {
Console.WriteLine(val);
}
Console.WriteLine("Count of elements = " + stack.Count);
Console.WriteLine("Element at the top = " + stack.Peek());
stack.Push("Ultrabook");
stack.Push("Cameras");
stack.Push("Keyboards");
Console.WriteLine("\nStack elements...updated");
foreach(string val in stack) {
Console.WriteLine(val);
}
Console.WriteLine("Element at the top = " + stack.Peek());
Console.WriteLine("\nCount of elements (updated) = " + stack.Count);
Console.WriteLine("\nRemoving and returning the element at the top = " + stack.Pop());
Console.Write("Count of elements (updated) = " + stack.Count);
Console.WriteLine("\nStack elements...updated");
foreach(string val in stack) {
Console.WriteLine(val);
}
}
}
আউটপুট
Stack elements... Notebook Laptop XPS Monitors Projectors Alienware Inspiron Count of elements = 7 Element at the top = Notebook Stack elements...updated Keyboards Cameras Ultrabook Notebook Laptop XPS Monitors Projectors Alienware Inspiron Element at the top = Keyboards Count of elements (updated) = 10 Removing and returning the element at the top = Keyboards Count of elements (updated) = 9 Stack elements...updated Cameras Ultrabook Notebook Laptop XPS Monitors Projectors Alienware Inspiron
উদাহরণ ২: Clone এবং Pop() একসাথে ব্যবহার
using System;
using System.Collections;
public class Demo {
public static void Main() {
Stack stack = new Stack();
stack.Push("Inspiron");
stack.Push("Alienware");
stack.Push("Projectors");
stack.Push("Monitors");
stack.Push("XPS");
stack.Push("Laptop");
stack.Push("Notebook");
Console.WriteLine("Stack elements...");
foreach(string val in stack) {
Console.WriteLine(val);
}
Console.WriteLine("Count of elements = " + stack.Count);
Console.WriteLine("Element Speakers is the stack? = " + stack.Contains("Speakers"));
stack.Push("Headphone");
stack.Push("Keyboard");
stack.Push("Earphone");
Console.WriteLine("\nStack elements...updated");
foreach(string val in stack) {
Console.WriteLine(val);
}
Console.WriteLine("Count of elements (updated) = " + stack.Count);
Console.WriteLine("Element Alienware is the stack? = " + stack.Contains("Alienware"));
Stack stack2 = (Stack)stack.Clone();
Console.WriteLine("\nStack elements...cloned");
foreach(string val in stack2) {
Console.WriteLine(val);
}
Console.WriteLine("Count of elements (stack2) = " + stack2.Count);
Console.WriteLine("Top of the Stack (stack2) = " + stack2.Peek());
Console.WriteLine("\nRemoving and returning the element at the top (stack2) = " + stack2.Pop());
Console.WriteLine("Count of elements (stack2) = " + stack2.Count);
Console.WriteLine("\nStack elements...(stack2) ");
foreach(string val in stack) {
Console.WriteLine(val);
}
}
}
আউটপুট
Stack elements... Notebook Laptop XPS Monitors Projectors Alienware Inspiron Count of elements = 7 Element Speakers is the stack? = False Stack elements...updated Earphone Keyboard Headphone Notebook Laptop XPS Monitors Projectors Alienware Inspiron Count of elements (updated) = 10 Element Alienware is the stack? = True Stack elements...cloned Earphone Keyboard Headphone Notebook Laptop XPS Monitors Projectors Alienware Inspiron Count of elements (stack2) = 10 Top of the Stack (stack2) = Earphone Removing and returning the element at the top (stack2) = Earphone Count of elements (stack2) = 9 Stack elements...(stack2) Earphone Keyboard Headphone Notebook Laptop XPS Monitors Projectors Alienware Inspiron
মূল পয়েন্টস
Pop()মেথড Stack-এর টপ এলিমেন্টটি রিটার্ন করে এবং Stack থেকে সরিয়ে দেয়।- যদি Stack খালি থাকে,
Pop()কল করলেInvalidOperationExceptionথ্রো করে। Peek()মেথড শুধু এলিমেন্টটি দেখায়, সরিয়ে দেয় না।- প্রতিটি
Pop()কলের পরCountপ্রপার্টি ১ করে কমে যায়।
