[rensfromrpas]

you'll need strtok:
(note i didn't test it)

Код:

if(!strcmp(cmd, "/givecash", true)
{
   tmp = strtok(cmdtext, idx);
   if(!strlen(tmp)) return SendClientMessage(playerid, 0xC0C0C0/*samp color :)*/, "USAGE: /givecash [ammount]");
   GivePlayerMoney(playerid, strval(tmp));  
   return 1;
}