[gamer931215]

I made you a function, hopefully this is what you want

pawn Код:

stock Comma(numbers) //by Gamer931215
{
    new temp[24],counter = -1;
    valstr(temp,numbers);
    for(new i = strlen(temp);i > 0; i--)
    {
        counter++;
        if(counter == 3)
        {
            strins(temp,",",i);
            counter = 0;
        }
    }
    return temp;
}

Edit: oh did slice ? well anyways this should work as well