print out random number and state odd/even

Hi All,

Need help in how to write a code to check odd or even numbers from a randomly generated number. The generated number should be printed out to say that this is an even or odd number between the preceding number and the number past. E.g. the random number is 6 it is an even number between 5 and 7.

Please help!

Use the Math class to generate a random number. The numbers to the immediate left and right should be the even / odd numbers you are looking for. Is this home work ?

Welcome to javaranch ahgoon. This post belongs in the java in general forum. A moderator will move it for you there.

Hi,
What have you attempted so far ?

i have tried the following but got error message and can't proceed.

<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<c:set var="luckyN" value="Page Value" scope="page" />
<%@ page import="java.util.*"%>
<% Random r=new Random();
int num = "r.nextInt(12)";
System.out.println(num);
int pno=num-1;
int nno=num+1;
%>

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Lucky Number Advisor</title>
</head>
<body>
<% int luckyNumber=(new java.util.Random()).nextInt(12)+1;
//The value will be in the range between 1 (inclusive) to 12 (inclusive)
pageContext.setAttribute("luckyN", "" + luckyNumber);
//set luckyNumber as a page scope variable named luckyN
%>
<h2>Don't Forget to consult me before stepping out from your house</h2>
Hello! Your Lucky Number today is
<c:out value="${luckyN}"/>

<c:set var="luckyN" value="<%=num%>"/>
<c:if test="${luckyN%2==0}">It is an even number and it is between <%=pno%>
and <%=nno%>
<br />
</c:if>
<c:if test="${luckyN%2!=0}">It is an odd number, and it is between <%=pno%> and <%=nno%>
<br />
</c:if>
<c:if test="luckyN"=1>It is an odd number, and it is right before 2.<br />
</c:if>
<c:if test="${luckyN=12}">It is an even number, and it is right after 11.<br />
</c:if>
</body>
</html>

Please post a new version of that code with only the "Java" part.

And why is everything in the JSP ? Process the data inside a servlet and pass the result to the JSP. Better still, write a plain old java object program that will do the calculation for you

ahgoon chow wrote:
Need help in how to write a code to check odd or even numbers from a randomly generated number.

I know it's only simple code, but surely they could have worked it out for themselves?

Campbell Ritchie wrote:I know it's only simple code, but surely they could have worked it out for themselves?

Simple things are often the hardest conceptually.