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2008.11.18 09:22
Libraries

LotsRisk - library for MetaTrader 4

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\MQL4\Include\
LotsRisk.mqh (1.63 KB)view

Parameters:

  • riskPercent - percent of the current balance you want to risk
  • sl - the value of the StopLoss for the given order
  • price - the open price of the order
  • error - refereced parameter. an error code, that is returned by the function

Note: I can't say that it works correctly. I've checked it approximately. So your comments are appreciated.

Here is an example:


   int riskPercentage = 3,
      error;
   double sl = Ask - 40 * Point,
      openPrice = Ask;   

   double lots = GetNeccessaryLotsWithRisk(riskPercentage, sl, openPrice, error);
   
   if (CompareDoubles(lots, 0))
   {
      switch (error)
      {
         case LOTS_TOO_BIG:   // lots are bigger than max lots
            Alert("Risk percentage is too big");
            break;

         case LOTS_TOO_SMALL: // lots are smaller than min lots
            Alert("Risk percentage is too small");
            break;

         default:             // formula's result =)
            Alert("It seems like you've got $0 or stoploss is too far");
            break;
      }
   }

Translated from Russian by MetaQuotes Software Corp.
Original code: https://www.mql5.com/ru/code/8568

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