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The listen() system call is designed to tell that a socket is ready to accept incoming connection.

Of course, we need first implementing the socket() and bind() system calls.

We are talking here about the server side.

The bind() system call function is used with socket().

It assigns the address of the second argument to the file descriptor retrieved by socket().
Of course before using bind(), we must have a valid fd generated by socket().

The socket() system call function will help us to create an end point.

This end point will allow for example to connect a client to a server.
Indeed, both of them (client and server) will have a socket() system call function on their implementation.

The container list may accept another container.
For example a pair.

So we are trying to add pairs inside a list. It will become a list of pairs!

In the snippet below, I'm using only one file.
So just compile and execute it to see the result.

We can of course transform a char into an int with the atoi() function.

But what we are going to do now it's to create our own function to transform a string (several char) into a number.

We are going to use the read() function to read on the standard input from our favorite shell.

So each time you will write something then type ENTER, the text written will be display on the shell.

Let's see this, with this tiny tutorial of the read() function with a C example.

The extern keyword is designed to explicitely tells someone, being watching a variable in a code, that this variable has been firstly declared in another file.

The extern keyword works also with C++.

An example of how using the for_each() function.

Notice that you can have the same result with an iterator, here an example.

The vector container is the most classic STL container.

In the snippet below, I can iterate through the vector, so I use an iterator to erase an element of the vector.
In our case, I removed the number 2 from the container and I added 80 to this place.

Let's see this example of the vector container.

The pair container cannot be iterated.

So we can use it for example to return a double value at the end of a function.

In the snippet below we are going to use it to change the first and the second value.
This, respectively with the pair.first and pair.second methods: