Declare the ding sound as global, that is above the main function, not inside it. Like this, you call the dingplay function from within void main but thesound is still local (available) only to the main function.
Or, a simpler way, why use a separate function just to play one specific sound looped? You could equally as well just have the ding.play_looped(); line directly in the main function, right below the line where you load the appropriate file into the sound object.
Hope this helps,
Lukas

Hello,
The thing is, the ding object is declared in the main function. That means that if you try to access it from another function, it will not recognise it. Think of it as 2 boxes. One is the main function, the other is the dingplay function. The ding sound is in the main box, so if you try to reach into the dingplay box to find that ding sound, you will come up empty. You can fix this by, instead of declaring the ding sound in your main loop, you can declare it outside of any function. Look at this code:
sound ding;
void main()
{
show_game_window("ding");
ding.load("c:\\windows\\media\\ding.wav");
wait(5);
dingplay();
}
void dingplay()
{
ding.play_looped();
}