Events as in scenes and such?
Perhaps you could place them on the map. For instance, you probably have a 2D array to represent your map, where you can walk and where you can't, etc. Perhaps you could add a secondary array the same size as your map which contains either some offset in to an array of event classes (or handles to event classes) on the squares for which events should trigger? This way when you take a step, you check that array and if an event should trigger where the player is standing, you fire it. Another approach is to just have an array of event classes which contain properties like their X and Y position and some active status flag. When the player moves you loop through them and activate if needed.

int events_length = events.length();
for(int I=0;i<events_length;i++)
{
//assume an event trigger zone is more than one square.
if(player.x >= events[i].left_edge&&player.x <= events[i].right_edge&&player.y >= events[i].bottom_edge&&player.y <= events[i].top_edge&&events[i].active)
{
events[i].trigger();
}
}

Lots of conditions, but only one if. You could wrap some of those checks up in a function if you want cleaner code but that's the general idea.

try within the main function. that could work.

@brian.kurosawa: I'm trying to understand what you want here. Do you want to implement an event-listener system / signals and slots design pattern?

If so, I recommend reading chapter 15 of Game Programming Patterns here:
http://gameprogrammingpatterns.com/contents.html

Move all of the code to intisde of the main function. You can't execute anything like an if statement etc outside of one.

if(ammo = 0, false)

This assigns the value 0 to the ammo variable, and the comma followed by the false isn't a valid expression. What you probably meant is this:
if (ammo == 0)

i wrote a turning sound for my game, but i have problem with the wait time, because it i don't use wait the game can't play my sounds. I use step.play_wait();, and i tryed step.play();

Are you giving a chance for the sound to play? E.G if your application finishes execution or the variable goes out of scope, then your sound won't play.

Regarding your second post, this check for if (score < 10) is probably done multiple times a second. When the check succeeds, the music starts playing but then in the next game tick, its done again and the music starts playing from the beginning. You could fix this by checking the status of the sound. Something like this:
if (score < 10 && gamemusic1.isPlaying() == false) // i'm not familiar with BGT's api, but you get the idea.

i tryed it, but i thing i wrote something wrong, because it doesn't works.
I used this code:
if(score<10&&gm==false)
{
gamemusic1.play_looped();
bool gm=true;
}

Thanks for the help.

Hi! I have a very annoying problem with BGT! I creating a menu-based game, where your decisions makes the story. And i using wariables to make the game more exciting. My problem: When i made a wariable for randomize some numbers, the wariable randomizing it once in the program! What can i do?

I don't understand what you want mean but if it is what i'm thinking probably you should try avoid using wait/play_wait and try a timer instead.

When your ennemies die/are stopped/etc., tell them to stop their sounds.