C# 2种顺序栈（泛型和object）

using System;
using  System.Collections.Generic;

namespace ConsoleApp1
{
   
    class Stack<Ttype>
    {
        private int top=0;
        private int bottom=0;
        private int maxSize;
        private Ttype[] element;
        public Stack(int size)
        {
            element = new Ttype[size+1];
            maxSize = size;
        }
        public bool Push(Ttype x)
        {
            if(top-bottom== maxSize)
                return false;
            else
            {
                element[top++] = x;
                return true;
            }
        }
        public Ttype Pop()
        {
            Ttype x = default(Ttype);
            if (top != bottom)
            {
                x = element[--top];
            }
             return x;
        }
        public Ttype Peep()
        {
            Ttype x = default(Ttype);
            if (top != bottom)
            {
                int temp = top - 1;
                x = element[temp];
            }
            return x;
        }
    }

    class Stack_object
    {
        private int top = 0;
        private int bottom = 0;
        private int maxSize;
        private object[] element;  //可以不同类型
        public Stack_object(int size)
        {
            element = new object[size + 1];
            maxSize = size;
        }
        public bool Push(object x)
        {
            if (top - bottom == maxSize)
                return false;
            else
            {
                element[top++] = x;
                return true;
            }
        }
        public object Pop()
        {
            object x = default(object);
            if (top != bottom)
            {
                x = element[--top];
            }
            return x;
        }
        public object Peep()
        {
            object x = default(object);
            if (top != bottom)
            {
                int temp = top - 1;
                x = element[temp];
            }
            return x;
        }
    }
    class Program
    {
        static void Main(string[] args)
        {
            var A = new int[]{ 1, 2, 3 };
            var B = new double []{ 1.1, 2.2, 3.3 };
            Stack<int> s = new Stack<int>(3);
            foreach (var item in A)
            {
                s.Push(item);
            }
            Console.WriteLine(s.Peep());


            Stack_object s1 = new Stack_object(6);
            foreach (var item in A)
            {
                s1.Push(item);
            }
            foreach (var item in B)
            {
                s1.Push(item);
            }
            for(int i = 0; i < 6; i++)
            {
                var x = s1.Pop();
                Console.WriteLine(x);
            }
           

        }
    }
   
}