opposite trading

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Hello, am new to mql4, i need some help with this code to trade opposite 

the ea place pending order and modify the pending order until it takes a trade..

so i double paste the order code for it to trade opposite but still no opposite trade

   int z=0;  
     for(i=0; i<OrdersTotal(); i++)
     {
      if(OrderSelect(i,SELECT_BY_POS,MODE_TRADES))
        {
         if(OrderMagicNumber()==Magic)
           {
            odty=OrderType();
            if(odty==OP_BUYLIMIT || odty==OP_SELLLIMIT)
               continue;
            if(OrderSymbol()==Symbol())
              {
               z++;
               switch(odty)
                 {
                  case OP_BUY:
                     if(TrailingStop<0)
                        break;
                     st=NormalizeDouble(OrderStopLoss(),NDigits);
                     p2=NormalizeDouble(Bid-trail,NDigits);
                     if(!((st==0.0 || p2>st)))
                        break;
                     ordmdf=OrderModify(OrderTicket(),OrderOpenPrice(),p2,OrderTakeProfit(),0,Blue);
                     if(!(!ordmdf))
                        break;
                      Print("Order Modify Error",(GetLastError()));
                      
                     break;
                  case OP_SELL:
                     if(TrailingStop<0)
                        break;
                     st=NormalizeDouble(OrderStopLoss(),NDigits);
                     p2=NormalizeDouble(Ask+trail,NDigits);
                     if(!((st==0.0 || p2<st)))
                        break;
                     ordmdf=OrderModify(OrderTicket(),OrderOpenPrice(),p2,OrderTakeProfit(),0,Red);
                     if(!(!ordmdf))
                        break;
                     Print("Order Modify Error", (GetLastError()));
                     
                      break;
                  case OP_BUYSTOP:
                     price=NormalizeDouble(Ask+offset,NDigits);
                     if(!((price<opp)))
                        break;
                     p2= NormalizeDouble(price -(StopLoss+MarketInfo(Symbol(),MODE_SPREAD)) * Point,NDigits);
                     ordmdf = OrderModify(OrderTicket(),price,p2,OrderTakeProfit(),0,Blue);
                     if(!(!ordmdf))
                        break;
                     Print("Order Modify Error", (GetLastError()));
                     
                      break;
                  case OP_SELLSTOP:
                     price=NormalizeDouble(Bid-offset,NDigits);
                     if(!((price>opp)))
                        break;
                     p2= NormalizeDouble(price +(StopLoss+MarketInfo(Symbol(),MODE_SPREAD)) * Point,NDigits);
                     ordmdf = OrderModify(OrderTicket(),price,p2,OrderTakeProfit(),0,Red);
                     if(!(!ordmdf))
                        break;
                    Print("Order Modify Error", (GetLastError()));
                     
                  }
              }
           }
        }
     }

     for(i=0; i<OrdersTotal(); i++)
     {
      if(OrderSelect(i,SELECT_BY_POS,MODE_TRADES))
        {
         if(OrderMagicNumber()==Magic)
           {
            odty=OrderType();
            if(odty==OP_BUYLIMIT || odty==OP_SELLLIMIT)
               continue;
            if(OrderSymbol()==Symbol())
              {
               z++;
               switch(odty)
                 {
                  case OP_SELL:
                     if(TrailingStop<0)
                        break;
                     st=NormalizeDouble(OrderStopLoss(),NDigits);
                     p2=NormalizeDouble(Bid-trail,NDigits);
                     if(!((st==0.0 || p2>st)))
                        break;
                     ordmdf=OrderModify(OrderTicket(),OrderOpenPrice(),p2,OrderTakeProfit(),0,Blue);
                     if(!(!ordmdf))
                        break;
                      Print("Order Modify Error",(GetLastError()));
                      
                     break;
                  case OP_BUY:
                     if(TrailingStop<0)
                        break;
                     st=NormalizeDouble(OrderStopLoss(),NDigits);
                     p2=NormalizeDouble(Ask+trail,NDigits);
                     if(!((st==0.0 || p2<st)))
                        break;
                     ordmdf=OrderModify(OrderTicket(),OrderOpenPrice(),p2,OrderTakeProfit(),0,Red);
                     if(!(!ordmdf))
                        break;
                     Print("Order Modify Error", (GetLastError()));
                     
                      break;
                  case OP_SELLSTOP:
                     price=NormalizeDouble(Ask+offset,NDigits);
                     if(!((price<opp)))
                        break;
                     p2= NormalizeDouble(price -(StopLoss+MarketInfo(Symbol(),MODE_SPREAD)) * Point,NDigits);
                     ordmdf = OrderModify(OrderTicket(),price,p2,OrderTakeProfit(),0,Blue);
                     if(!(!ordmdf))
                        break;
                     Print("Order Modify Error", (GetLastError()));
                     
                      break;
                  case OP_BUYSTOP:
                     price=NormalizeDouble(Bid-offset,NDigits);
                     if(!((price>opp)))
                        break;
                     p2= NormalizeDouble(price +(StopLoss+MarketInfo(Symbol(),MODE_SPREAD)) * Point,NDigits);
                     ordmdf = OrderModify(OrderTicket(),price,p2,OrderTakeProfit(),0,Red);
                     if(!(!ordmdf))
                        break;
                    Print("Order Modify Error", (GetLastError()));
                     
                  }
              }
           }
        }
     }
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