for(【初始化表達式】;【條件表達式】;【迭代表達式 】)
{
          //語句塊
}

for (int num = 1; num < 0; num++)
{
    Response.Write(num);
}

Response.Write("結果：<br />" );
for (int num = 1; num < 5; ++num)
{
    Response.Write(num + "<br />");
}

int tmp = 0;
i = 1;
i = tmp;