Showing posts with label Computer Science. Show all posts
Showing posts with label Computer Science. Show all posts

What is Public and Private IP Addresses?

Difference between Public and Private IP Addresses

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Private IP Addresses:

When many computers or devices connect either to the cable or to the wireless, they create a private network. Within this network, a unique IP address is assigned to share files and resets to each device. The IP address of all the devices in this network is called private address.

Public IP addresses:

The public IP address is the ISP (Internet Service Provider). This gives your home network an identity in the outside world. This IP address is unique across the Internet.

Public IP address can be static or dynamic. Static public IP address does not change and it is mainly used for accessing a service (such as an IP camera, FTP server, email server or remote access to the computer) or web hosting on the Internet. It has to be bought from ISP.

Dynamic IP address,
on the other hand, receives the IP address available and changes every time it is connected to the Internet. The maximum Internet user has a dynamic IP address for his computer, which is disconnected when disconnected from the Internet and gets a new IP address when reconnected.

What is IP Address?

IP Address definition

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IP Address means Internet Protocol. This is a Numerical label that is used to identify all the devices (i.e. computers, printers etc) of the network. Any IP address mainly works in two form, one for hosting and network interface identification and second one to identify the location of another device.

When the desingers designed the IP address, the IP address was a 32 bit number and this system was called IPv4. But now with the growth of the Internet, the 32 bit number system which got the IP Addresses started falling short, the designers launched a new IP address system called IPv6. Although IPV4 is still very popular and it is in use, it will convert to IPV6. The new IP system is the IPv6 128 bit address and it was developed in 1995. IPv6 was standardized in 1998 while deployment started from mid 2000. 

The IP address always contains 4 blocks of numbers, which are separated by period. Each block has potential ranges from 0 to 255, which means that each block has 256 potential values. For example, IP address looks like 192.168.1.10.

3 ranges from these addresses have been reserved for special purpose. The first address 0.0.0.0 is related to the default network and 255.255.255.255 are called Broadcast Addresses. The third address is the 127.0.0.1 loopback address, and it shows your own machine or computer.

IP version 4 (IPv4):

Internet Protocol version 4 (IPv4) This is the fourth version of Internet Protocol (IP), which is used to identify network devices. IPv4 addresses are 32 bits tall and support 4,294,967,296 addresses (although many of them are reserved for specific purposes, such as 10.0.0.0 and 127.0.0.0)

192.168.0.1 This is a common example of an IPv4 address. The most easily identifiable IP ranges are 192.168.0.1 - 192.168.0.255, because these addresses we use at home or office.

IP version 6 (IPv6):

A new version of Internet Protocol version 6 (IPv6) was developed due to the worsening IPv4 addressing potential future due to the popular Internet growth. This is new and unchanged version of IPv4. It is also known as IPng.

Internet Protocol version 6 (IPv6) is 128 bits long. Therefore, it supports 2 ^ 128 internet addresses, which are equivalent to 340.282.366.920.938.000.000.000.000.000.000.000 addresses. These are many addresses and they are more than enough to continue internet operations for a very long time.

Define Structure of a Program

Structure of a Program

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Probably the best way to start learning a programming language is by writing a program. Therefore, here is our first program:

Best C++ Books


Input
// my first program in C++
#include <iostream>
using namespace std;
int main ()
{
cout << "Hello World!";
return 0;
}
Output
 Hello World!
The first panel shows the source code for our first program. The second one shows the result of the program once compiled and executed. The way to edit and compile a program depends on the compiler you are using. Depending on whether it has a Development Interface or not and on its version. Consult the compilers section and the manual or help included with your compiler if you have doubts on how to compile a C++ console program.
// my first program in C++
This is a comment line. All lines beginning with two slash signs (//) are considered comments and do not have any effect on the behavior of the program. The programmer can use them to include short explanations or observations within the source code itself. In this case, the line is a brief description of what our program is.
using namespace std;
All the elements of the standard C++ library are declared within what is called a namespace, the namespace with the name std. So in order to access its functionality, we declare with this expression that we will be using these entities. This line is very frequent in C++ programs that use the standard library, and in fact, it will be included in most of the source codes included in these tutorials.
int main ()
This line corresponds to the beginning of the definition of the main function. The main function is the point by where all C++ programs start their execution, independently of its location within the source code. It does not matter whether there are other functions with other names defined before or after it - the instructions contained within this function's definition will always be the first ones to be executed in any C++ program. For that same reason, it is essential that all C++ programs have a main function.

The word main is followed in the code by a pair of parentheses (()). That is because it is a function declaration: In C++, what differentiates a function declaration from other types of expressions are these parentheses that follow its name. Optionally, these parentheses may enclose a list of parameters within them.

Right after these parentheses, we can find the body of the main function enclosed in braces ({}). What is contained within these braces is what the function does when it is executed.

cout << "Hello World!";
This line is a C++ statement. A statement is a simple or compound expression that can actually produce some effect. In fact, this statement performs the only action that generates a visible effect in our first program. out represents the standard output stream in C++, and the meaning of the entire statement is to insert a sequence of characters (in this case the Hello World sequence of characters) into the standard output stream (which usually is the screen). the cout is declared in the stream standard file within the std namespace, so that's why we needed to include that specific file and to declare that we were going to use this specific namespace earlier in our code.

Notice that the statement ends with a semicolon character (;). This character is used to mark the end of the statement and in fact, it must be included at the end of all expression statements in all C++ programs (one of the most common syntax errors is indeed to forget to include some semicolon after a statement).

return 0;
The return statement causes the main function to finish. the return may be followed by a return code (in our example is followed by the return code 0). A return code of 0 for the main function is generally interpreted as the program worked as expected without any errors during its execution. This is the most usual way to end a C++ console program.

Best PHP and MySQL Books on Amazon

How to learn PHP and MySQL programming for web development?

Know here about top books for learning PHP and MySQL programmin languages for web development. As we know that both are very in the field of web technology. PHP is a server-side programming language mainly used for web development and is also used as a general purpose programming language. It has become a rage in the Internet world. PHP: The Complete Reference, as the name suggests is a complete reference guide to the widely popular PHP.

This book deals with explaining how to personalize the PHP work space, define operators and variables, manipulate strings and arrays and the way in which one can use HTML. It also covers details on how to access database information, track client-side preferences using cookies, execute FTP and e-mail transactions and publish your applications to the Web. Additionally, this book deals in PHP's next generation Web 2.0 design features including AJAX, XML and RSS.