How do I make a calculation at JSP using data from SQL

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Javascript

SQL

I don't know whether can or not to do a code for make a calculation, the data get from SQL and code for calculation create at JSP file.

I hope anyone can tell me the solution for this problem, Thank You!

What I have tried:

From this code, the totalmealAlw, totalmealAlwS and totalmealAlwP I want to do the add operation:

<tr>
    <td>Total Meal ALW</td>
    <td><%=rs.getString("totalmealAlw") %></td>
    <td>Total Meal ALW</td>
    <td><%=rs.getString("totalmealAlwS") %></td>
    <td>Total Meal ALW</td>
    <td><%=rs.getString("totalmealAlwP") %></td>
</tr>

I want to make a calculation, but I don't know the right code to type:

double meal = <%=rs.getString("totalmealAlw") %> + <%=rs.getString("totalmealAlwS") %>; 
out.println(meal);