ProMec is a small graphical project I did for the Mecanics course in the first year of faculty at UPB, with prof. A. Craifaleanu. It simulates the movement of a complex system made out of several bars.

The software is distributed under CC-GNU GPL license.

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Talk is a simple chat program. It uses the very simple Cesar code to encrypt the messages. Select the mode (client or server), the IP address and the port, then press “Conectare” ( “Asteapta” for the server), and, if there is another user, the message area will be activated.

The software is distributed under CC-GNU GPL license.

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Query is a whois-like program that allows you to find the status of a domain or IP address. He uses Whois servers to obtain informations like the domain owner, expiration data, etc.

The software is distributed under CC-GNU GPL license.

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In part 1 we introduced the const keyword. Today we’ll talk about constant pointers.

Let’s say you want to define a constant pointer. Which of the following declarations will you use?

The answer is: the second or the third. The first declaration defines a pointer to a constant integer and the third one defines a constant pointer to a constant integer.

Another interesting case is when defining a constant char array (credits go to Ulrich Drepper, link via RazvanD):

Although this code will give a warning (passing `const char *’ as argument 1 of `strcpy(char *, const char *)’ discards qualifiers is the exact message on Dev-C++), it will run, because s is allocated in the heap, so it is treated much like a pointer. You can force the value to be constant by adding the static keyword, wich will force the compiler to allocate s in read-only memory:

First of all, let’s see what the const modifier means in the C standard. Basically, a const variable is one who’s value can’t be changed. Actually, things are not so simple – as we’ll see later, you can change a constant variable. The standard states that “If an attempt is made to modify an object defined with a const-qualified type through use of an lvalue with non-const-qualified type, the behavior is undefined.” On some architectures, constant variables are put in a special section (sometimes called .rodata – from Read Only DATA) of the program by the compiler.

If you want to define a constant in C/C++, you can write:

Both declarations mean the same thing: define a new integer with a fixed value. So, if you want to change the value of v1, how would you do it? By using pointers:

Of course, you shouldn’t do that, as the are no guarantees that the result will be what you expect it to be, but with most compilers, v1 will be 5 after running the code presented above.

Digital/analogue clock A DevC++ program that shows an analogue or digital clock. The program shows the usage of classes in C++ and the usage of Windows drawing functions.

The software is distributed under CC-GNU GPL license.

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BlackJack (21) is a simple simulation of a Black Jack game. Is shows the usage of bitmaps as background for MFC applications.

The software is distributed under CC-GNU GPL license.

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ThePlayZone is a simple mp3 player. It can read ID3v1 tags, the bitrate and frequency, and play m3u and pls playlists.

The software is distributed under Licenţa CC-GNU GPL.

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The software is distributed under CC-GNU GPL license.

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TicTacToe is a program to simulate a TicTacToe game. There are 3 difficulty levels, from the one with no AI to the one where you can’t win. The program also has a scoreboard.

The software is distributed under CC-GNU GPL license.

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