Back test Problem

So far the common problem that rises when doing back test is digit difference between brokers. But the fact that I never find that problem when running in mode even real account. However I realize that the closing function in the expert is not normalized as it must. Therefore I make an update of MQL to solve this problem. But again if you make backtesting then historical data should come from the related broker or the backtesting become meaningless when using different broker with different data.
Although I give a code “4digits” in the file’s name, but it does not mean it can’t work with 5 digit broker. The difference between previous update, that this update normalize all closing function with broker’s digit. Therefore I am still keeping the previous update, if current update can fix digit problem then I will delete the previous one.