Create multi-currency EA

[andrw11]

i'd like to make my EA iterate through symbols , but for some reason the code isn't working 

void OnTick()
  {
  
     
    for(int i=0;i<SymbolsTotal(true);i++) {
    
    string sym = SymbolName(i,true);

    MqlRates pricedata [];
    ArraySetAsSeries(pricedata,true);
    int data =CopyRates(sym,Period(),0,550,pricedata);
    
    double ask = NormalizeDouble(SymbolInfoDouble(sym,SYMBOL_ASK),_Digits);
    double bid = NormalizeDouble(SymbolInfoDouble(sym,SYMBOL_BID),_Digits);
   

    then my logic 

 }
}

[Hakim Precious]

andrw11:

i'd like to make my EA iterate through symbols , but for some reason the code isn't working 

You are not doing it right check here  https://www.mql5.com/en/docs/constants/tradingconstants/enum_trade_request_actions