paul 16 / 18 — ITLC Tutorials

January 18, 2017January 18, 2017

Port Scanner in Python

Watch out! This tutorial is over 9 years old. Please keep this in mind as some code snippets provided may no longer work or need modification to work on current systems.

This post will show how you can make a small and easy-to-use port scanner program written in Python. There are many ways of doing this with Python, but we’re going to do it using the built-in module Socket.

Do not run programs like this one against servers in the college. Behaviour like this could be seen as malicious and get you suspended!

Continue reading “

January 18, 2017January 18, 2017

Use Google’s Copy Of JQuery in WordPress

Watch out! This tutorial is over 9 years old. Please keep this in mind as some code snippets provided may no longer work or need modification to work on current systems.

Grabs jQuery from Google’s CDN which your visitors will hopefully have cached. This can then be called in your header with <?php wp_enqueue_script("jquery"); ?>

// Call the google CDN version of jQuery for the frontend
// Make sure you use this with wp_enqueue_script('jquery'); in your header
function itlc_jquery_enqueue() {
	wp_deregister_script('jquery');
	wp_register_script('jquery', "http" . ($_SERVER['SERVER_PORT'] == 443 ? "s" : "") . "://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js", false, null);
	wp_enqueue_script('jquery');
}
if (!is_admin()) add_action("wp_enqueue_scripts", "itlc_jquery_enqueue", 11);

January 17, 2017January 18, 2017

Hello World in Python

Watch out! This tutorial is over 9 years old. Please keep this in mind as some code snippets provided may no longer work or need modification to work on current systems.

This is how you would display “Hello World” in Python.

print("Hello, World!")

January 16, 2017January 18, 2017

Android Hello World

Watch out! This tutorial is over 9 years old. Please keep this in mind as some code snippets provided may no longer work or need modification to work on current systems.

Before you start writing your first example using Android SDK, you have to make sure that you have set-up your Android development environment properly. We also assume that you have a little bit working knowledge with Android Studio from class.

So let us proceed to write a simple Android Application which will print “Hello World!”.

Continue reading “

January 16, 2017January 18, 2017

A “Hello, World” HTML document

Watch out! This tutorial is over 9 years old. Please keep this in mind as some code snippets provided may no longer work or need modification to work on current systems.

You create a file and put special character sequences called HTML elements into your file. These elements identify the structural parts of your document. When a Web browser displays the file, it will display your file’s content, but not the characters that make up the structure.

Here is an example:

<!DOCTYPE html PUBLIC "-//IETF//DTD HTML 2.0//EN">
<HTML>
   <HEAD>
      <TITLE>
         A Small Hello 
      </TITLE>
   </HEAD>
<BODY>
   <H1>Hi</H1>
   <P>This is very minimal "hello world" HTML document.</P> 
</BODY>
</HTML>

Only the elements that you place in the BODY element (that is, between <BODY> and </BODY> ) ever get displayed in a Web browser’s window.

In this example, only the contents of the H1 element (between <H1> and </H1> ) and the P element (between <P> and </P> ) are displayed.

January 16, 2017January 18, 2017

Hello World in C++

Watch out! This tutorial is over 9 years old. Please keep this in mind as some code snippets provided may no longer work or need modification to work on current systems.

This is how you would display “Hello World” in C++.

#include <iostream>

int main()
{
  std::cout << "Hello World!";
}

January 16, 2017January 18, 2017

Hello World in C#

Watch out! This tutorial is over 9 years old. Please keep this in mind as some code snippets provided may no longer work or need modification to work on current systems.

This is how you would display “Hello World” in C#.

public class HelloWorld
{
   public static void Main()
   {
      System.Console.WriteLine("Hello World!");
   }
}

January 16, 2017January 18, 2017

Hello World in Visual Basic .NET

Watch out! This tutorial is over 9 years old. Please keep this in mind as some code snippets provided may no longer work or need modification to work on current systems.

This is how you would display “Hello World” in Visual Basic.

' Allow easy reference to the System namespace classes.
Imports System

' This module houses the application's entry point.
Public Module modmain
   ' Main is the application's entry point.
   Sub Main()
     ' Write text to the console.
     Console.WriteLine ("Hello World using Visual Basic!")
   End Sub
End Module

The command line for compiling the program is the following:

vbc.exe /t:exe /debug+ /optionstrict+ /out:.\HelloVB.exe HelloWorld.vb

In the previous line, /out specifies the output file, and /t indicates the target type.

January 16, 2017January 18, 2017

Hello World in Java

Watch out! This tutorial is over 9 years old. Please keep this in mind as some code snippets provided may no longer work or need modification to work on current systems.

This is how you would display “Hello World” in your Java application.

We break the process of programming in Java into three steps:

Create the program by typing it into a text editor and saving it to a file named, say, HelloWorld.java.
Compile it by typing “javac HelloWorld.java” in the terminal window.
Execute (or run) it by typing “java HelloWorld” in the terminal window.

So, the code in our file would look like

public class HelloWorld {
   public static void main(String[] args) {
      // Prints "Hello, World" in the terminal window.
      System.out.println("Hello World");
   }
}

To compile HelloWorld.java type the text below at the terminal

javac HelloWorld.java

Once you compile your program, you can execute it. This is the exciting part, where the computer follows your instructions. To run the HelloWorld program, type the following in the terminal window:

java HelloWorld

That’s it!

January 16, 2017January 18, 2017

Hello World in PowerShell

Watch out! This tutorial is over 9 years old. Please keep this in mind as some code snippets provided may no longer work or need modification to work on current systems.

This is how you would display “Hello World” in PowerShell.

Note: PowerShell commands also have the ability to be run in a script with the .ps1 extension but running scripts are disabled by default for security purposes. Firstly, you will need to set the Execution Policy. The cmdlet Get-ExecutionPolicy will show you that the initial policy is set to ‘Restricted’. This will prevent scripts from running. You can change it with the Set-ExecutionPolicy cmdlet. There are four options Restricted, Remote-signed, Signed and Unrestricted. We recommend Remote-Signed as it will allow you to run the scripts that you have created locally and still keep your machine secure.

So, just type

Set-ExecutionPolicy RemoteSigned

Now you can use notepad to create your first script. In Notepad type:

Write-Host "Hello World"

This will need to be saved in a file called something like HelloWorld.ps1.

Then from a PowerShell console type

.\HelloWorld.ps1

The reason you need the .\ is because a PowerShell security feature ensures that you are targeting a specific script in a specific location,. And that’s all there is to it.