Variable not defined after running for() loop.

Question

Hi,
I have a little problem, I have created a for loop, which seems to work, except that a variable within the for() loop gets lost, because if I try to call the variable after the loop, it says it's not there. anyway, here is my code, followed by the error. Thanks!
<%
Class.forName( "sun.jdbc.odbc.JdbcOdbcDriver");
Connection con = DriverManager.getConnection("jdbc:odbc:testdb");
Statement stmt = con.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE, ResultSet.CONCUR_UPDATABLE);
String sql_count = "SELECT COUNT(*) FROM users";
ResultSet cn = stmt.executeQuery(sql_count);
cn.first();
int row_count = cn.getInt(1);
int num = (int)(Math.random() * (row_count));
int inum;
for (inum=0; inum<row_count; inum++)
int jnum = inum + num;
if (jnum >= row_count) { jnum = 1; }
String sql = "SELECT * FROM users WHERE ID = "+jnum+"";
ResultSet rs = stmt.executeQuery(sql);
int ce = rs.getInt("cr_earned");
int cu = rs.getInt("cr_used");
if ((ce-cu) > 0) { inum = row_count + 1; }
String sql = "SELECT * FROM users WHERE ID = "+jnum+"";
ResultSet rs = stmt.executeQuery(sql);
rs.first();
String url = rs.getString("url");
con.close();
%>
***********************ERROR***********************
Generated servlet error:
C:\tomcat\jakarta-tomcat-4.0\work\localhost\examples\gtt\surf$jsp.java:93: Undefined variable or class name: rs
rs.first();
^
An error occurred between lines: 17 and 43 in the jsp file: /gtt/surf.jsp
Generated servlet error:
C:\tomcat\jakarta-tomcat-4.0\work\localhost\examples\gtt\surf$jsp.java:94: Undefined variable or class name: rs
String url = rs.getString("url");
^

Answer 1

now i've defined them all before the loop and I get this error. Error is following modified code below.
<%
Class.forName( "sun.jdbc.odbc.JdbcOdbcDriver");
Connection con = DriverManager.getConnection("jdbc:odbc:testdb");
Statement stmt = con.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE, ResultSet.CONCUR_UPDATABLE);
String sql_count = "SELECT COUNT(*) FROM users";
ResultSet cn = stmt.executeQuery(sql_count);
cn.first();
int row_count = cn.getInt(1);
int num = (int)(Math.random() * (row_count));
int inum;
int jnum;
ResultSet rs;
for (inum=0; inum<row_count; inum++)
jnum = inum + num;
if (jnum >= row_count) { jnum = 1; }
String sql = "SELECT * FROM users WHERE ID = "+jnum+"";
rs = stmt.executeQuery(sql);
int ce = rs.getInt("cr_earned");
int cu = rs.getInt("cr_used");
if ((ce-cu) > 0) { inum = row_count + 1; }
rs.first();
String url = rs.getString("url");
con.close();
%>
***********ERROR***************
An error occurred between lines: 17 and 45 in the jsp file: /gtt/surf.jsp
Generated servlet error:
C:\tomcat\jakarta-tomcat-4.0\work\localhost\examples\gtt\surf$jsp.java:95: Variable rs may not have been initialized.
rs.first();
^
Thanks anyone.... ;-)