hi everyone! i'm sorry for my bad english but i'm not a master in this language xD
however i hope you understand me.
i'm a newbie in Allegro programming.
i know C ,in detail i know how loops,pointers,arrays and matrices work.
i studied also stack,hash-table,tree and list.
I don't know C++ yet.I saw many games done with allegro and C/C++ and i decided to use this lib.
I would create a platform game but i don't find any type of tutorial about it.I see many sourcecode of platform done with allegro on youtube and i observe that to create the map of the game are used classes...is it possible to create a map (in C) without classes? maybe only with the coordinates of the ostacles?
I also try to study a sourcecode of a platform game but is too difficult for me...and also it was written in C++ that i don't understand.
can you advise me some platform-tutorial? or a good book?

thx all!

You could find some examples here. Compiling them(and modifying in order to understand them better) could be a good start.

Good luck.

Perhaps this is a good case for writing a book before that dreadful Game Programming All In One is updated

Or hey, why not email the authors asking if they want it updated and donate 10% of commission to Matthew's hosting bill.

Better yet: set_color_depth(desktop_color_depth())

The most simple tilemap I can think of.
This code is very simple, too simple.
It's also untested but I don't think I made a big mistake anywhere.

int map[4][4] = {{1,1,1,1},{1,0,0,1},{1,0,0,1},{1,1,1,1}}
int i;
int t;
for (i = 0; i < 4; i++){
   for (t = 0; t < 4; t++){
       if (map[i][t] == 1){
           // Assuming you're using allegro 4
           rectfill(buffer, t * 32, i * 32, t * 32 + 32, i * 32 + 32, makecol(255,255,255));
       }
    }
}

Well replace rectfill with al_draw_filled_rectangle

al_draw_filled_rectangle(t * 32, i *32, t * 32 +32, i *32 + 32, al_map_rgb(255,255,255), 1);

I assume you know how to get a basic game loop running (if you don't, there should be an allegro 5 tutorials about this, this one should be good http://wiki.allegro.cc/index.php?title=Allegro_5_Tutorial ).
Also, if you are going to use this function, make sure that you call al_init_primitives_addon()
And for a better effect, draw images, not simple rectangles.

You don't have to create another matrix for objects on the map. I'd call it a 2d-array though, in programming it's mostly called a 2d array unless you actually use matrix operations on it.
If you want your objects to be tile-based, you can create another 2d array.
For things like enemies, you best store them in arrays.

In order to make objects collide with the tiles on the map you'll have to use simple maths.
I'll explain how you can use (axis-aligned) bounding boxes for collision.

I'll create a simple player struct for this.

I did not test this, but this is the basic idea, it's very simple, this way however your sprites can not be larger than 2 tiles wide or 2 tiles high, if they are, the collision (and response) might not work properly. If something does not work I think you can fix it, the collision detection and movement are also 'slow', not optimized at all

And how to use

// Somewhere in your initialization
PLAYER player;
create_player(&player, 32, 32, 16, 32); // Use whatever values you like
                                        // the & symbol means address of
                                        // We only pass the address of the player to the functions, not the whole player structure itself

// In your main loop

step_player(&player);
// after doing all the logic
draw_player(&player);

Sorry made a mistake there. You'll also have to pass your map as a parameter.