if---elseif 範例 JAVA SCRIPT + .net

<script runat="server">    
    protected void Page_Load(object sender, EventArgs e)    {
        //變數 price 代表物品單價, amount 代表數量, discount 代表折扣
        int price, amount, discount;

        //物品單價為 400 元
        price =400;

        //假設要購買 50個
        amount = 50;
      
        if (amount < 10)
        {
            discount = 10;              
        }         else if (amount >= 10 & amount < 20)

        {
            discount = 9;
        }
        else if (amount >= 20 & amount < 30)

       {
            discount = 8;
        }
        else

       {
            discount = 6;
        }

        Response.Write("物品單價為" + price + "元, 您要購買" +
                       amount + "個, 折扣為" + discount + "折, 價格為" +
                       price * amount * discount / 10);
    }</script>