In the extern parameters, add :

Code:

extern double lots=0.1;
extern bool martingale=false;
extern double multiplier=2.0;
extern double minlot=0.01;
extern double maxlot=10;

After the extern parameters, add :

Code:

double lotsfactor=1,ilots;
double initiallotsfactor=1;

In the init() function, before return(), add :

Code:

   //|---------martingale initialization

   int tempfactor,total=OrdersTotal();
   if(tempfactor==0 && total>0)
   {
      for(int cnt=0;cnt<total;cnt++)
      {
         if(OrderSelect(cnt,SELECT_BY_POS))
         {
            if(OrderSymbol()==Symbol() && OrderMagicNumber()==magic)
            {
               tempfactor=NormalizeDouble(OrderLots()/lots,1+(MarketInfo(Symbol(),MODE_MINLOT)==0.01));
               break;
            }
         }
      }
   }
   int histotal=OrdersHistoryTotal();
   if(tempfactor==0&&histotal>0)
   {
      for(cnt=0;cnt<histotal;cnt++)
      {
         if(OrderSelect(cnt,SELECT_BY_POS,MODE_HISTORY))
         {
            if(OrderSymbol()==Symbol() && OrderMagicNumber()==magic)
            {
               tempfactor=NormalizeDouble(OrderLots()/lots,1+(MarketInfo(Symbol(),MODE_MINLOT)==0.01));
               break;
            }
         }
      }
   }
   if(tempfactor>0)
   lotsfactor=tempfactor;

Before each ordersend() function, add :

Code:

if(martingale)ilots=NormalizeDouble(lots*martingalefactor(),2);else ilots=lots;
if(ilots<minlot)ilots=minlot;if(ilots>maxlot)ilots=maxlot;

In the ordersend() function, replace lots by :

Code:

ilots

At the end of the code, add :

Code:

//|---------martingale

int martingalefactor()
{
   int histotal=OrdersHistoryTotal();
   if (histotal>0)
   {
      for(int cnt=histotal-1;cnt>=0;cnt--)
      {
         if(OrderSelect(cnt,SELECT_BY_POS,MODE_HISTORY))
         {
            if(OrderSymbol()==Symbol() && OrderMagicNumber()==magic)
            {
               if(OrderProfit()<0)
               {
                  lotsfactor=lotsfactor*multiplier;
                  return(lotsfactor);
               }
               else
               {
                  lotsfactor=initiallotsfactor;
                  if(lotsfactor<=0)
                  {
                     lotsfactor=1;
                  }
                  return(lotsfactor);
               }
            }
         }
      }
   }
   return(lotsfactor);
}