[selten98]

add this on top of ur script:

pawn Код:

new HasC4[MAX_PLAYERS];
new C4Placed[MAX_PLAYERS];

pawn Код:

public OnPlayerSpawn(playerid)
{
  HasC4[playerid] =0;
  C4Placed[playerid] =0;
}

the buy script:

pawn Код:

public OnPlayerEnterCheckpoint(playerid)//or something else
{
  if(HasC4[playerid] =1)
  {
    SendClientMessage(playerid,COLOR_RED,"You already own C4");
  }
  if(cash >= 14999)
  {
     SendClientMessage(playerid,COLOR_RED,"You Don't have enough cash");
   }
  HasC4[playerid] =1;
  GivePlayerMoney(playerid, -15000);
}

the rest of the script:

pawn Код:

if(!strcmp(cmd,"/placeC4",true))
{
   if(IsPlayerInVehicleAnyVehicle(playerid))
   {
      new bomb, Float:x,Float:y,Float:z;
      bomb = IsValidObject(1252);
      GetPlayerPos(playerid,x,y,z);
      CreateObject(bomb,x,y,z+1,0,0,0);
      HasC4[playerid] =0;
      C4Placed[playerid] =1;
   }
}
if(!strcmp(cmd,"/detonateC4",true))
{
if(C4Placed[playerid] =0)
  {
     SendClientMessage(playerid,COLOR_RED,"You Haven't placed C4");
  }
   new bomb - IsValidObject(1252);
   new Float:bx,Float:by,Float:bz;
   GetObjectPos(bomb,bx,by,bz);
   CreateExplosion(bx,by,bz+1,7,10);
   DestroyObject(bomb);
   C4Placed[playerid] =0);
}

i hope this will work