I'm writing JSP Code for the first time. when I'm declaring an expression statement it's giving me an error;
sumcannot be resolved to a variable.
Here's my code for your reference:
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1" import="java.util.Date,java.util.*"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<%!
public int factorial(int n){
int ans=1;
for(int i=1; i<=n; i++){
ans=ans*i;
}
return ans;
}
%>
<%@include file="header.html" %>
<%
String op = request.getParameter("btn");
int n1 = Integer.parseInt(request.getParameter("num1"));
int n2 = Integer.parseInt(request.getParameter("num2"));
if(op.equals("add")){
int sum=n1+n2;
}else{
int sum=factorial(n1);
}
Date dt=new Date();
out.println("testing jsp");
%>
<h2> Addition is: <%=sum %> </h2>
<h4>Today's Date : <%=dt %></h4>
<%@include file="footer.html" %>
</body>
</html>
Error is in Addition = sum line.
You print the variable where it is not available. You can place the output of a variable right after calculation where the variable is yet exists. Don't define a local variable in the blocked code, if you use it outside a block or statement.