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MQL4 Reference  Trading functions  OrderSwap

 
double OrderSwap( )
Returns swap value for the currently selected order.
Note: The order must be previously selected by the OrderSelect() function.
Sample:
  if(OrderSelect(order_id, SELECT_BY_TICKET)==true)
    Print("Swap for the order #", order_id, " ",OrderSwap());
  else
    Print("OrderSelect failed error code is",GetLastError());