C program to print all even numbers from 1 to n - IProgramX

by - IProgram X on - June 24, 2018

Q. Write a program to accept an integer n and display all even numbers upto n

Program

#include<stdio.h>
int main()
{
int n,j=1;
printf("enter nth value:");
scanf("%d",&n);
n++;
while(n!=j)
{
if(j%2==0)
{
printf("%d\t",j);
}
j++;
}
}

Output:

enter nth value:12
2 4 6 8 10 12

16 Comments

AnonymousJune 12, 2026 at 12:36 AM
1 Simple servlet to display "Hello World"

package com.demo;

import java.io.IOException;
import java.io.PrintWriter;

import jakarta.servlet.ServletException;
import jakarta.servlet.annotation.WebServlet;
import jakarta.servlet.http.HttpServlet;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;

@WebServlet("/hello")
public class HelloServlet extends HttpServlet {
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html");
PrintWriter out = response.getWriter();
out.println("<h1Hello, World!</h1");
}
}
ReplyDelete
Replies
AnonymousJune 12, 2026 at 12:51 AM
2 LifeCycleServlet : servlet that logs message for init(), service() and distroy()

package com.demo;

import java.io.IOException;
import java.io.PrintWriter;

import jakarta.servlet.ServletException;
import jakarta.servlet.annotation.WebServlet;
import jakarta.servlet.http.HttpServlet;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;

@WebServlet("/life")
public class LifeCycleServlet extends HttpServlet {
@Override
public void init() throws ServletException {
System.out.println("Servlet initialized: init() method called");
}

@Override
protected void service(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
System.out.println("Service method called");
response.setContentType("text/html");
PrintWriter out = response.getWriter();
out.println("<h2Servlet Life Cycle Demonstration</h2");
out.println("<pCheck the server console for life cycle messages.</p");
}

@Override
public void destroy() {
System.out.println("Servlet destroyed: destroy() method called");
}
}
ReplyDelete
Replies
AnonymousJune 12, 2026 at 1:02 AM
2 UserServlet : servlet to accept user details and display them

package com.demo;

import jakarta.servlet.ServletException;
import jakarta.servlet.annotation.WebServlet;
import jakarta.servlet.http.HttpServlet;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;

@WebServlet("/UserServlet")
public class UserServlet extends HttpServlet {

protected void doPost(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {

response.setContentType("text/html");

PrintWriter out = response.getWriter();

String name = request.getParameter("name");
String email = request.getParameter("email");
String age = request.getParameter("age");

out.println("User FormEnter User Details</h2

<form action="UserServlet" method="post"

Name:
<input type="text" name="name"
<br<br

Email:
<input type="email" name="email"
<br<br

Age:
<input type="number" name="age"
<br<br

<input type="submit" value="Submit"

</form

</body
</html
ReplyDelete
Replies
AnonymousJune 12, 2026 at 1:10 AM
3 UserServlet : servlet to accept user details and display them

package com.demo;

import jakarta.servlet.ServletException;
import jakarta.servlet.annotation.WebServlet;
import jakarta.servlet.http.HttpServlet;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;

@WebServlet("/UserServlet")
public class UserServlet extends HttpServlet {

protected void doPost(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {

response.setContentType("text/html");

PrintWriter out = response.getWriter();

String name = request.getParameter("name");
String email = request.getParameter("email");
String age = request.getParameter("age");

out.println("<bName:</b " + name + "</p");
out.println("<p<bEmail:</b " + email + "</p");
out.println("<p<bAge:</b " + age + "</p");
out.println("</body</html");
}
}
ReplyDelete
Replies
AnonymousJune 12, 2026 at 1:12 AM
3 UserServlet : servlet to accept user details and display them

package com.demo;

import jakarta.servlet.ServletException;
import jakarta.servlet.annotation.WebServlet;
import jakarta.servlet.http.HttpServlet;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;

@WebServlet("/UserServlet")
public class UserServlet extends HttpServlet {

protected void doPost(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {

response.setContentType("text/html");

PrintWriter out = response.getWriter();

String name = request.getParameter("name");
String email = request.getParameter("email");
String age = request.getParameter("age");

out.println("<html<body");
out.println("<h2User Details Submitted Successfully</h2");
out.println("<p<bName:</b " + name + "</p");
out.println("<p<bEmail:</b " + email + "</p");
out.println("<p<bAge:</b " + age + "</p");
out.println("</body</html");
}
}
ReplyDelete
Replies
AnonymousJune 12, 2026 at 1:14 AM
3 UserServlet : servlet to accept user details and display them

package com.demo;

import jakarta.servlet.ServletException;
import jakarta.servlet.annotation.WebServlet;
import jakarta.servlet.http.HttpServlet;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;

@WebServlet("/UserServlet")
public class UserServlet extends HttpServlet {

protected void doPost(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {

response.setContentType("text/html");

PrintWriter out = response.getWriter();

String name = request.getParameter("name");
String email = request.getParameter("email");
String age = request.getParameter("age");

out.println("Enter User Details</h2

<form action="UserServlet" method="post"

Name:
<input type="text" name="name"
<br<br

Email:
<input type="email" name="email"
<br<br

Age:
<input type="number" name="age"
<br<br

<input type="submit" value="Submit"

</form

</body
</html
ReplyDelete
Replies
AnonymousJune 12, 2026 at 1:18 AM
3 index.html

Enter User Details</h2

<form action="UserServlet" method="post"

Name:
<input type="text" name="name"
<br<br

Email:
<input type="email" name="email"
<br<br

Age:
<input type="number" name="age"
<br<br

<input type="submit" value="Submit"

</form

</body
</html
ReplyDelete
Replies
AnonymousJune 12, 2026 at 1:19 AM
3 index html

Enter User Details</h2

<form action="UserServlet" method="post"

Name:
<input type="text" name="name"
<br<br

Email:
<input type="email" name="email"
<br<br

Age:
<input type="number" name="age"
<br<br

<input type="submit" value="Submit"

</form

</body
</html
ReplyDelete
Replies
AnonymousJune 12, 2026 at 1:20 AM
3 index html

<DOCTYPE html
<html
<head
<titleUser Form</title
</head
<body

<h2Enter User Details</h2

<form action="UserServlet" method="post"

Name:
<input type="text" name="name"
<br<br

Email:
<input type="email" name="email"
<br<br

Age:
<input type="number" name="age"
<br<br

<input type="submit" value="Submit"

</form

</body
</html
ReplyDelete
Replies
AnonymousJune 12, 2026 at 1:40 AM
4 ThemeServlet : servlet that stores user prefrences in cookies

package com.demo;

import jakarta.servlet.ServletException;
import jakarta.servlet.annotation.WebServlet;
import jakarta.servlet.http.Cookie;
import jakarta.servlet.http.HttpServlet;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;

import java.io.IOException;
import java.io.PrintWriter;

@WebServlet("/ThemeServlet")
public class ThemeServlet extends HttpServlet {

protected void doGet(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {

response.setContentType("text/html");

PrintWriter out = response.getWriter();

String themeColor = "white";

Cookie[] cookies = request.getCookies();

if (cookies != null) {
for (Cookie c : cookies) {
if (c.getName().equals("theme")) {
themeColor = c.getValue();
}
}
}

out.println("<html<body style='background-color:" + themeColor + ";' $ ");
out.println("<h2Welcome Back!</h2");
out.println("<pYour selected theme color is: " + themeColor + "</p");
out.println("<a href='index.html' $ Change Theme</a");
out.println("</body</html");
}

protected void doPost(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {

String theme = request.getParameter("theme");

Cookie cookie = new Cookie("theme", theme);

cookie.setMaxAge(60 * 60 * 24);

response.addCookie(cookie);

response.sendRedirect("ThemeServlet");
}
}
ReplyDelete
Replies
AnonymousJune 12, 2026 at 1:43 AM
<!DOCTYPE html
<html
<head
<titleTheme Selection</title
</head
<body

<h2Select Your Theme Color</h2

<form action="ThemeServlet" method="post"

<select name="theme"
<option value="white"$White</option
<option value="lightblue"$Light Blue</option
<option value="lightgreen"$Light Green</option
<option value="pink"$Pink</option
</select

<br<br

<input type="submit" value="Save Preference"

</form

</body
</html
ReplyDelete
Replies
AnonymousJune 12, 2026 at 1:54 AM
5 date.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8" import="java.util.*"%

<!DOCTYPE html
<html
<head
<meta charset="UTF-8"
<titleDate Example</title
</head
<body

<h1To display the current Date</h1

<%
Date curr_date = new Date();
%$

<p<%= curr_date %$</p

</body
</html
ReplyDelete
Replies
AnonymousJune 12, 2026 at 2:27 AM
CREATE DATABASE student_db;

USE student_db;

CREATE TABLE U_register(
id INT PRIMARY KEY,
name VARCHAR(50),
email VARCHAR(100),
password VARCHAR(50)
);
ReplyDelete
Replies
AnonymousJune 12, 2026 at 2:29 AM
6

SQL

CREATE DATABASE student_db;

USE student_db;

CREATE TABLE U_register(
id INT PRIMARY KEY,
name VARCHAR(50),
email VARCHAR(100),
password VARCHAR(50)
);

6 registration.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%

<html
<body

<form action="save.jsp" method="post"

ID
<input type="number" name="id"$<br<br

Name
<input type="text" name="name"$<br<br

Email
<input type="email" name="email"$<br<br

Password
<input type="password" name="password"$<br<br

<input type="submit" value="Submit"

</form

</body
</html
ReplyDelete
Replies
AnonymousJune 12, 2026 at 2:32 AM
6

SQL

CREATE DATABASE student_db;

USE student_db;

CREATE TABLE U_register(
id INT PRIMARY KEY,
name VARCHAR(50),
email VARCHAR(100),
password VARCHAR(50)
);

6 registration.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%

<html
<body

<form action="save.jsp" method="post"

ID
<input type="number" name="id"$<br<br

Name
<input type="text" name="name"$<br<br

Email
<input type="email" name="email"$<br<br

Password
<input type="password" name="password"$<br<br

<input type="submit" value="Submit"

</form

</body
</html

6 save.jsp

<%@ page import="java.sql.*" %$

<%
String id=request.getParameter("id");
String name=request.getParameter("name");
String email=request.getParameter("email");
String password=request.getParameter("password");

try{

Class.forName("com.mysql.cj.jdbc.Driver");

Connection con=
DriverManager.getConnection(
"jdbc:mysql://localhost:3306/student_db",
"root",
"root");

PreparedStatement ps=
con.prepareStatement(
"INSERT INTO U_register(id,name,email,password) VALUES(?,?,?,?)");

ps.setString(1,id);
ps.setString(2,name);
ps.setString(3,email);
ps.setString(4,password);

int i=ps.executeUpdate();

if(i$0){
out.println("<h3Registration Successful!</h3");
}else{
out.println("<h3Registration Failed!</h3");
}

}catch(Exception e){
out.println(e);
}
%$

<br
<a href="display.jsp"$View Entry</a
ReplyDelete
Replies
AnonymousJune 12, 2026 at 2:36 AM
6

SQL

CREATE DATABASE student_db;

USE student_db;

CREATE TABLE U_register(
id INT PRIMARY KEY,
name VARCHAR(50),
email VARCHAR(100),
password VARCHAR(50)
);

6 registration.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%

<html
<body

<form action="save.jsp" method="post"

ID
<input type="number" name="id"$<br<br

Name
<input type="text" name="name"$<br<br

Email
<input type="email" name="email"$<br<br

Password
<input type="password" name="password"$<br<br

<input type="submit" value="Submit"

</form

</body
</html

6 save.jsp

<%@ page import="java.sql.*" %$

<%
String id=request.getParameter("id");
String name=request.getParameter("name");
String email=request.getParameter("email");
String password=request.getParameter("password");

try{

Class.forName("com.mysql.cj.jdbc.Driver");

Connection con=
DriverManager.getConnection(
"jdbc:mysql://localhost:3306/student_db",
"root",
"root");

PreparedStatement ps=
con.prepareStatement(
"INSERT INTO U_register(id,name,email,password) VALUES(?,?,?,?)");

ps.setString(1,id);
ps.setString(2,name);
ps.setString(3,email);
ps.setString(4,password);

int i=ps.executeUpdate();

if(i$0){
out.println("<h3Registration Successful!</h3");
}else{
out.println("<h3Registration Failed!</h3");
}

}catch(Exception e){
out.println(e);
}
%$

<br
<a href="display.jsp"$View Entry</a

6 display.jsp

<%@ page import="java.sql.*" %

<html
<body

<h2Registered Users</h2

<table border="1"

<tr
<thID</th
<thName</th
<thEmail</th
<thPassword</th
</tr

<%
try{

Class.forName("com.mysql.cj.jdbc.Driver");

Connection con=
DriverManager.getConnection(
"jdbc:mysql://localhost:3306/student_db",
"root",
"root");

Statement st=con.createStatement();

ResultSet rs=
st.executeQuery("SELECT * FROM U_register");

while(rs.next()){
%$

<tr
<td<%= rs.getInt("id") %$</td
<td<%= rs.getString("name") %$</td
<td<%= rs.getString("email") %$</td
<td<%= rs.getString("password") %$</td
</tr

<%
}

con.close();

}catch(Exception e){
out.println(e);
}
%$

</table

</body
</html
ReplyDelete
Replies

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