anchor.diff:              Período:<br/>
               <input type="text" name="idade" value="<%=periodo%>"><br/><br/>
               <input type="submit" name="sendForm" value="Enviar"><br/>
  -        </form>  
  +        </form> 
  +            
  +            
              
       </body>
   </html>
  
positive.code:         <title>Tabela Price</title>
      </head>
      <body
         <%--<%@include file="WEB-INF/jspf/menu.jspf" %>--%>
         <h1><b>Tabela Price</h1></b><br/><br/>
  
  
negative.code:            periodo = request.getParameter("periodo");
             }
          %>
           <%
               //declarando do valor principal, juros e periodo como double
            double vp = 0, j = 0, p = 0;
            try{
                vp = Integer.parseInt(request.getParameter("vp"));
                j = Integer.parseInt(request.getParameter("j"));
                p = Integer.parseInt(request.getParameter("p"));
            }catch(Exception ex){}
          %>
          <form>
              Valor Principal:<br/>
              <input type="text" name="nome" value="<%=vprinc%>"><br/>
  