Calculator Servlet using Radio Buttons

Design HTML or JSP Page to accept user input :

Enter the following code snippet in the  body  tag:

<form action="calculation">
   <input type="text" name="fnum"/>
   <br/>
   <input type="text" name="snum"/>
   <br/>
   Select Operation
   <br/>
   <input type="radio" name="calc" value="Add"/>Add
   <input type="radio" name="calc" value="Sub"/>Subtract
   <input type="radio" name="calc" value="Div"/>Divide
   <input type="radio" name="calc" value="Multi"/>Multiply
   <br/>
   <input type="submit" value="Calculate" name="submit"/>
</form>

Retrive user input & display the output of the calcultion:

Enter the following code in the doGet() of the servlet:


//assuming request as the object of the HttpServletRequest Class.
//retriving & storing the values from the textboxes into the String Variables.
String n1 = request.getParameter("fnum");
int num1 = Integer.parseInt(n1); //Converting String into Integer Variable
String n2 = request.getParameter("snum");
int num2 = Integer.parseInt(n2); int ans=0;

//performing calculation according to the selection made from the Radio Buttons named "calc".
if(request.getParameter("calc").equals("Add"))
ans = num1+num2;
if(request.getParameter("calc").equals("Sub"))
ans = num1-num2;
if(request.getParameter("calc").equals("Div"))
ans = num1/num2;
if(request.getParameter("calc").equals("Multi"))
ans = num1*num2;

//assuming response as the object of the HttpServletResponse Class.
//displaying output to the user 
response.getWriter().println(ans);