Stack ( array )

Stack_Array.cs

using System;

namespace ConsoleApp1
{
    public class Program
    {
        private static StackArray<int> stackArray;
        static void Main(string[] args)
        {
            stackArray = new StackArray<int>(2);

            // Push
            Console.WriteLine("Try Push 100"); stackArray.Push(100);
            Console.WriteLine("Try Push 200"); stackArray.Push(200);
            Console.WriteLine("Try Push 300"); stackArray.Push(300);

            // Top
            Console.WriteLine("TOP is: " + stackArray.Top());

            // Pop
            Console.WriteLine("Pop Data is: " + stackArray.Pop());

            // IsEmpty
            Console.WriteLine("IsEmpty: " + stackArray.IsEmpty());

            stackArray.PrintNode();
        }
    }

    public class StackArray<T>
    {
        private T[] array;
        private int topIdx;

        public StackArray(int capacity)
        {
            array = new T[capacity];
            topIdx = -1;
        }

        public void Push(T data)
        {
            if (topIdx == array.Length - 1)
            {
                Console.WriteLine("Push Fail.. data: " + data);
                return;
            }

            array[++topIdx] = data;
        }

        public T Pop()
        {
            if (IsEmpty())
                throw new Exception("Empty Stack..");

            var data = array[topIdx];
            array[topIdx--] = default(T);

            return data;
        }

        public T Top()
        {
            if (IsEmpty())
                throw new Exception("Empty Stack..");

            return array[topIdx];
        }

        public bool IsEmpty()
        {
            return topIdx < 0;
        }

        public void PrintNode()
        {
            if (IsEmpty())
            {
                Console.WriteLine("Empty Stack");
                return;
            }

            Console.WriteLine("---- TOP ----");
            for(var i = topIdx; i >= 0; --i)
            {
                Console.WriteLine(array[i]);
            }
        }

    }
}