我正在尝试将两个值相乘,这是我从上一页获得的参数。我知道我可以使用以下方法分别显示它们:
<p> val1: <%= request.getParameter( "val1" ) %> </p>
和
<p> val2: <%= request.getParameter( "val2" ) %> </p>
但是,当执行乘法运算以求出这两个值的乘积时,下面尝试的尝试不起作用,所以我知道这种方法不正确
<p>product: (<%= request.getParameter( "val1" ) %> * <%= request.getParameter( "val2" ) %>)</p>
答案 0 :(得分:1)
根据收到的错误,似乎您正在使用Java,因此您应该以这种方式转换整数:
<p>product: (<%= Integer.parseInt(request.getParameter("val1")) * Integer.parseInt(request.getParameter("val2")) %>)</p>
答案 1 :(得分:0)
假设您使用的这些符号用于ASPX页面,则答案将强制转换为 int 。
public DisplayForm()
{
InitializeComponent();
chart1.Series.Clear();
var series = chart1.Series.Add("Series1");
series.XValueMember = "Year";
series.YValueMembers = "TotalIncome";
ShowSoldProduct();
}
private void ShowSoldProduct()
{
using (HotelEntities db = new HotelEntities())
{
try
{
var result = (from pr in db.Transactions
select pr).ToArray();
chart1.DataSource = result
.GroupBy(x => x.TransactionDate.Value.Year)
.Select(g => new
{
Year = g.Key,
TotalIncome = g.Sum(y => y.TotalPrice)
})
.ToArray();
chart1.DataSource = result;
chart1.DataBind();
chart1.Show();
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
}