anchor.diff:          <title>Tabela Price</title>
       </head>
       <body
  +       <%--<%@include file="WEB-INF/jspf/cabecalho.jspf" %>--%> 
          <%--<%@include file="WEB-INF/jspf/menu.jspf" %>--%>
          <h1><b>Tabela Price</h1></b><br/><br/>
   
  
positive.code:             Período:<br/>
              <input type="text" name="idade" value="<%=periodo%>"><br/><br/>
              <input type="submit" name="sendForm" value="Enviar"><br/>
          </form>  
             
      </body>
  </html>
  
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/>
  