How to create a MQL4 function that returns the largest losing trade?

Question

I am trying to create an Expert Adviser (EA) in MQL4 language.

How to code a function that returns the largest losing trade, (and not the total losing trades)?

Answer 1

The following function will return the ticket of the largest loss trade.

With a default of loss = DBL_MAX, this can still return profitable trades with the lowest profit.
With a loss = 0, it will only return a trade with the most negative profit or zero.

Will return a ticket of such trade and EMPTY, if no trades found.

int LargestLoss( int magic, double loss = DBL_MAX )
{
        int ticket=EMPTY;
        for(int i=0; i < Orderstotal(); i++)
        {
                if(OrderSelect(i,SELECT_BY_POS,MODE_TRADES))
                {
                        if(OrderSymbol()==Symbol() && OrderMagicNumber()==magic && OrderProfit()+OrderSwap()+OrderCommision()<loss)
                        {
                                loss=OrderProfit()+OrderSwap()+OrderCommision();
                                ticket=OrderTicket();
                        }
                }
        }
        return ticket;
}