[C#] 동적 배열

            int[] arr = new int[2];
            int[] temp = { 3, 5, 7 };
            arr = temp;

            foreach(int n in arr)
            {
                Console.WriteLine(n);
            }

---

동적배열의 확장

        int[] arr;

        public App()
        {
            arr = new int[2];
            AddItem(3);
            AddItem(5);
            AddItem(7);

            foreach (int n in arr)
            {
                Console.WriteLine(n);
            }
        }

        void AddItem(int item)
        {
            int emptyIndex = -1;

            for (int i = 0; i < this.arr.Length; i++)
            {
                if (this.arr[i] == 0)
                {
                    emptyIndex = i;
                    break;
                }
            }

            if (emptyIndex == -1)
            {
                int[] temp = new int[this.arr.Length + 1];

                for (int i = 0; i < this.arr.Length; i++)
                {
                    temp[i] = this.arr[i];
                }
                this.arr = temp;

                this.arr[this.arr.Length - 1] = item;
            }

            else
            {
                this.arr[emptyIndex] = item;
            }
        }

---

동적배열의 축소

    class App
    {
        int[] arr = { 3, 4, 5 };

        public App()
        {
            Remove(3);
            

            foreach (int n in arr)
            {
                Console.WriteLine(n);
            }
        }

        void Remove(int number)
        {
            for (int i = 0; i < arr.Length; i++)
            {
                if (arr[i] == number)
                {
                    arr[i] = 0;
                    Push();
                    return;
                }
            }
        }

        void Push()
        {
            bool check = false;
            while (!check)
            {
                check = true;

                for (int i = 0; i < arr.Length-1; i++)
                {
                    if (arr[i] == 0)
                    {
                        arr[i] = arr[i + 1];
                        arr[i + 1] = 0;

                        check = false;
                    }
                }
            }

            int[] temp = new int[arr.Length - 1];
            for (int i = 0; i < temp.Length; i++)
            {
                    temp[i] = arr[i];                
            }

            arr = temp;
        }

---

        class Item
        {
            public string name;

            public Item(string name)
            {
                this.name = name;
            }
        }

        Item[] inven = new Item[1];

        public App()
        {
            Console.WriteLine("inven Length: {0}", inven.Length);

            AddItem("단검");
            AddItem("장검");
            AddItem("대검");
            AddItem("창");

            for (int i = 0; i < inven.Length; i++)
            {
                if (inven[i] != null)
                {
                    Console.WriteLine(inven[i].name);
                }
            }
            Console.WriteLine("inven Length: {0}",inven.Length);
        }

        void AddItem(string name)
        {
            for(int i=0; i<inven.Length; i++)
            {
                if (inven[i] == null)
                {
                    inven[i] = new Item(name);
                    return;
                }
            }

            AddArray(name);
        }

        void AddArray(string name)
        {
            Item[] temp = new Item[inven.Length + 1];

            for(int i=0; i<inven.Length; i++)
            {
                temp[i] = inven[i];
            }
            inven = temp;

            AddItem(name);
        }