Convert MQL4 to .EX4

MetaEditor

Your source code is an MQL4 file (which has an MQ4 file extension - the part after the dot in the file name). It is a text-lke file. As an example this is code from a script ...

int start(){

   string str="";
   str= str + "MODE_DIGITS="        + DoubleToStr(MarketInfo(Symbol(),MODE_DIGITS),0)          +"\n";
   str= str + "MODE_SPREAD="        + DoubleToStr(MarketInfo(Symbol(),MODE_SPREAD),0)          +"\n";
   str= str + "MODE_STOPLEVEL="     + DoubleToStr(MarketInfo(Symbol(),MODE_STOPLEVEL),0)       +"\n";
   str= str + "MODE_FREEZELEVEL="   + DoubleToStr(MarketInfo(Symbol(),MODE_FREEZELEVEL),0)     +"\n";
   str= str + "MODE_TICKVALUE="     + DoubleToStr(MarketInfo(Symbol(),MODE_TICKVALUE),Digits)  +"\n";
   str= str + "MODE_TICKSIZE="      + DoubleToStr(MarketInfo(Symbol(),MODE_TICKSIZE),Digits)   +"\n";
   str= str + "MODE_POINT   ="      + DoubleToStr(MarketInfo(Symbol(),MODE_POINT),Digits)      +"\n";
   str= str + "MODE_MINLOT="        + DoubleToStr(MarketInfo(Symbol(),MODE_MINLOT),3)          +"\n";
   str= str + "MODE_MAXLOT="        + DoubleToStr(MarketInfo(Symbol(),MODE_MAXLOT),3)          +"\n";
   str= str + "MODE_LOTSIZE="       + DoubleToStr(MarketInfo(Symbol(),MODE_LOTSIZE),0)         +"\n";
   str= str + "MODE_MARGINREQUIRED="+ DoubleToStr(MarketInfo(Symbol(),MODE_MARGINREQUIRED),2)  +"\n";
   Comment(str);
   
   return(0);
}

You use the meta-editor to change the code and it will save it with a file extension of MQ4. When you click "compile" it converts the program into something more understandable to a computer, an EX4 file, an "executable" or binary file. This is what you actually run as a program.

Thanks for the lesson Dabbler

how to convert mql

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No need . . . https://www.mql5.com/ru/code/9127

When I use mql metaeditor to compile an mq4 file into an ex4 expert file, it used to show up with a cap and gown icon.  Now it shows up with a scroll icon even though the file extension is ex4 and the mql4 terminal cannot run it as an expert.  What is wrong?

Fix your old code.

It was discussed several times, I will not repeat what you have to check, use the search engine.