StackUsingArray.csx

class Stack
{
    const int MAX_SIZE = 100;
    public int[] list { get; set; }
    public int top { get; set; }

    public Stack()
    {
        top = 0;
        list = new int[MAX_SIZE];
    }

    public bool Push(int data)
    {
        if (top == MAX_SIZE)
            return false;
        list[top] = data;
        top++;
        return true;
    }

    public int Pop()
    {
        if (top == 0)
            return -1;
        top--;
        return list[top];
    }
}

class Program
{
    static void Main(string[] args)
    {
        Stack stack = new Stack();
        int data;
        Console.WriteLine("Welcome to stack using Array program");
        int choice = -1;
        while (choice != 0)
        {
            Console.WriteLine("0.Exit");
            Console.WriteLine("1.Push");
            Console.WriteLine("2.Pop");
            Console.WriteLine("Please enter appropriate choice");
            choice = int.Parse(Console.ReadLine());

            switch (choice)
            {
                case 1:
                    Console.WriteLine("Please enter the element");
                    data = int.Parse(Console.ReadLine());
                    if (stack.Push(data))
                        Console.WriteLine("Element pushed successfully");
                    else
                        Console.WriteLine("Cant push element, Stack is full");
                    break;
                case 2:
                    data = stack.Pop();
                    if (data == -1)
                        Console.WriteLine("Stack is already empty");
                    else
                        Console.WriteLine("Element: " + data);
                    break;
                default:
                    break;
            }
        }
    }
}