using System;

public class Program

{

     public static void Main()

     {   

            string[] stack = new string[52];//creates an array of 52 spaces for the deck of card.

            int top = -1;//top is -1 so innitally there is nothing on top

​

            //test code

            Console.WriteLine(peek(top, stack));

            push( ref top, stack,"Ace of Spade");

            push( ref top, stack, "Ace of Heart");

            push( ref top, stack, "Ace of Club");

            push( ref top, stack, "5 of Heart");

            push( ref top, stack, "9 of Club");

            Console.WriteLine(peek(top,  stack));

            push( ref top, stack, "King of Spade");

            Console.WriteLine(pop(ref top, stack));

            Console.WriteLine(peek(top, stack));

        }

        public static bool is_empty(int top)//takes the top value and check if the array is empty

        {

            if (top == -1)

            { return true; }

            else

            { return false; }

        }

        public static bool is_full (int top)//takes the top value and check if the array is already full

        {

            if (top == 51)

            { return true; }

            else

            { return false; }

        }

        public static string peek(int top,  string[] stack)//method to get the top value in the stack without removing it 

        {

            if (is_empty(top)==true)

            { Console.WriteLine( "Error! The Stack is empty ");

                return null;

            }

            else 

            { return stack[top]; }

        }

        public static void push( ref int top, string[] stack, string data)

            //checks if the stack is full

            //if it is not full, then add the inputed value at the top of stack

        {

            if (is_full(top) == true)

            { Console.WriteLine("the stack is full"); }

            else

            {

                top = top + 1;

                stack[top] = data;

            }

        }

        public static string pop(ref int top, string[] stack)

        {

            if (is_empty(top) == true)

                //checks if the stack is empty

                //if it is empty it is an error

            { Console.WriteLine("the stack is empty");

                return null;

            }

            else

            { 

                //if it's not an empty, it returns the top value by removing it and reduces the top value by 1.

                string temp = stack[top];

                top = top - 1;

                return temp;

            }

        }

}