https://www.mql5.com/en/articles/81

Migrating from MQL4 to MQL5
- 2010.05.17
- Sergey Pavlov
- www.mql5.com
This article is a quick guide to MQL4 language functions, it will help you to migrate your programs from MQL4 to MQL5. For each MQL4 function (except trading functions) the description and MQL5 implementation are presented, it allows you to reduce the conversion time significantly. For convenience, the MQL4 functions are divided into groups, similar to MQL4 Reference.

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my code is in mt4 format with
Ask - undeclared identifier
Bid - undeclared identifier
OP_BUY - undeclared identifier
OP_SELL - undeclared identifier
boolean return TRUE or True of FALSE or False - undeclared identifier
RefreshRates - function not defined
AccountEquity - function not defined
MarketInfo or MODE_MINLOT or MODE_MAXLOT - function not defined
OrderSend - wrong parameters count
IsTradeContextBusy - function not defined
MODE_TRADES - undeclared identifier
OrderSelect - wrong parameters count
OrderOpenPrice - function not defined
OrderModify - function not defined