C#: Remove specified element from a stack

Last update on December 20 2024 12:53:05 (UTC/GMT +8 hours)

Write a C# program to remove specified element from a given stack.

Sample Solution:

C# Code:

using System;

// Implementation of a Stack data structure
public class Stack
{
    private int[] items; // Array to hold stack elements
    private int top;     // Index representing the top of the stack

    // Constructor to initialize the stack with a specified size
    public Stack(int size)
    {
        items = new int[size]; // Initializing the array with the given size
        top = -1;              // Initializing top to -1, indicating an empty stack
    }

    // Method to check if the stack is empty
    public bool IsEmpty()
    {
        return top == -1; // Returns true if top is -1 (empty stack), otherwise false
    }

    // Method to check if the stack is full
    public bool IsFull()
    {
        return top == items.Length - 1; // Returns true if top is at the last index of the array (full stack)
    }

    // Method to push an element onto the stack
    public void Push(int item)
    {
        if (IsFull())
        {
            Console.WriteLine("Stack Full!"); // Displays a message if the stack is full
            return;
        }

        items[++top] = item; // Inserts the item at the incremented top index
    }

    // Method to pop an element from the stack
    public int Pop()
    {
        if (IsEmpty())
        {
            Console.WriteLine("Stack underflow"); // Displays a message if the stack is empty
            return -1;
        }

        return items[top--]; // Removes and returns the top element by decrementing top
    }

    // Method to peek at the top element of the stack without removing it
    public int Peek()
    {
        if (IsEmpty())
        {
            Console.WriteLine("Stack is empty"); // Displays a message if the stack is empty
            return -1;
        }

        return items[top]; // Returns the element at the top index without removing it
    }

    // Method to get the current size of the stack
    public static int Size(Stack stack)
    {
        return stack.top + 1; // Returns the number of elements in the stack
    }

    // Method to remove a specific element from the stack
    public static void RemoveAnElement(Stack stack, int value)
    {
        Stack temp = new Stack(Size(stack)); // Create a temporary stack to hold elements

        // Iterate through the original stack and remove the specified value
        while (!stack.IsEmpty())
        {
            int element = stack.Pop();

            // If the element is not the value to be removed, push it to the temporary stack
            if (element != value)
            {
                temp.Push(element);
            }
        }

        // Transfer elements from the temporary stack back to the original stack
        while (!temp.IsEmpty())
        {
            stack.Push(temp.Pop());
        }
    }

    // Method to display the stack elements
    public static void Display(Stack stack)
    {
        if (stack.IsEmpty())
        {
            Console.WriteLine("Stack is empty");
            return;
        }

        Console.WriteLine("Stack elements:");
        for (int i = stack.top; i >= 0; i--)
        {
            Console.Write(stack.items[i] + " "); // Displays each element in the stack
        }
    }
}

// Main class to demonstrate the functionality of the Stack class
public class Program
{
    public static void Main(string[] args)
    {
        Console.WriteLine("Initialize a stack:");
        Stack stack = new Stack(5); // Creating a stack with a size of 5

        Console.WriteLine("\nInput some elements onto the stack:");
        stack.Push(10);
        stack.Push(20);
        stack.Push(30);
        stack.Push(40);
        stack.Push(50);
        Stack.Display(stack); // Displaying the elements in the original stack

        Console.WriteLine("\n\nRemove 30 from the said stack:");
        Stack.RemoveAnElement(stack, 30); // Removing the specified element from the stack
        Stack.Display(stack);

        Console.WriteLine("\n\nRemove 50 from the said stack:");
        Stack.RemoveAnElement(stack, 50); // Removing another specified element from the stack
        Stack.Display(stack);
    }
}

Sample Output:

Initialize a stack:

Input some elements onto the stack:
Stack elements:
50 40 30 20 10 

Remove 30 from the said stack:
Stack elements:
50 40 20 10 

Remove 50 from the said stack:
Stack elements:
40 20 10

Flowchart:

C# Sharp Code Editor:

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