[Correlli]

This will loop for 21 players - IDs: 0-20

pawn Код:

for(new i = 0; i < 21; i++)
{
  if(IsPlayerConnected(i)) SendClientMessage(i, 0xAA000AA, "HAHA!");
}

This will loop for 22 players - IDs: 0-21

pawn Код:

for(new i = 0; i <= 21; i++)
{
  if(IsPlayerConnected(i)) SendClientMessage(i, 0xAA000AA, "HAHA!");
}

The only difference in this code from the first one is that i've used <= so this means if i is smaller than 21 or equal to 21.

And i suggest to you to use ******'s foreach include - it's faster than normal for loop and you don't have to use IsPlayerConnected function because foreach already has this check in its code.

foreach include - http://forum.sa-mp.com/index.php?topic=117573.0

Example with foreach:

pawn Код:

foreach(Player, i) SendClientMessage(i, 0xAA000AA, "HAHA!");