<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>원주율 구하기</title>
</head>
<body>
<form action="/jsp01/ex04/02" method="post">
반지름 <input type="number" name="ban"> cm <br>
<button>계산</button>
</form>
<div>
<%
if(request.getAttribute("area")!=null){
%>
원의 넓이는 : <%=request.getAttribute("area") %>
<%
}
%>
</div>
</body>
</html>
그냥 공부 한거 적는 벨로그 하하하핳ㅎ하하하핳하ㅏ