potenze.jsp

<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
 <head>
 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
 <title>Potenze - Gianfranco Oddenino</title>
 <link rel="stylesheet" type="text/css" href="stile.css">
 </head>
 <body>
 <%@ include file="WEB-INF/jspf/header.jspf"%>
 <%@ include file="WEB-INF/jspf/menu.jspf"%>
 <div id="content">
 <h2>Potenze</h2>
 <form action="potenze.jsp" method="get">
 Inserisci un numero <input type="text" name="n"/><br/>
 Seleziona l'operazione
 <select name="op">
 <option value="2">Quadrato</option>
 <option value="3">Cubo</option>
 <option value="4">Radice quadrata</option>
 </select><br/>
 <input type="reset" value="Cancella" />
 <input type="submit" value="Calcola" />
 </form>
 <% String valore = request.getParameter("n");
 if (valore != null) {
 int n = Integer.parseInt(valore);
 %>
 <p>n = <%=n%><br />
 <% int op = Integer.parseInt(request.getParameter("op"));
 switch (op) {
 case 2: %>n² = <%=n * n %><% break;
 case 3: %>n³ = <%=n * n * n %><% break;
 case 4: %>n½ = <%=Math.sqrt(n)%><% break;
 }
 }
 %>
 </p>
 </div>
 <%@ include file="WEB-INF/jspf/footer.jspf"%>
 </body>
</html>