How to compile a calculator?

How to compile a calculator?

<Form action = "./calculation. asp">

<Input type = "text" size = "1" name = "op1 value = <% Response. Write Request (" op1 ") %>

<Input type = "submit" name = "operation value =" plus ">

<Input type = "text" size = "1" name = "op2 value = <% Response. Write Request (" op2 ") %>

Equals

<%

Dim result

If Request ("operation") = "plus" Then

Result = CLng (Request ("op1") + CLng (Request ("op2 "))

Else

Result = "? "

End If

Response. Write result

%>

</Form>