ni jawapan yg sorang metaquotes nye rep. jawap soalan pasal compatibility
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MQL4 and MQL5
To those who interesting in compatibility: unfortunately, the languages are not compatible. And you should rewrite your EAs. But you should also understand that we doing it not to make you redo the EA developments every time when we launching a new platform.
From the beginning of MT5 development we thought the we will be able to save the compatibility. And we said about it many times. But the numerous traders/developers requests made us change our mind. We`ve understood that just cant make a new language compatible. At the same time we`ve made MQL5 more powerful and in this way we gave you, traders and developers, more abilities - that was our main goal in developing of MQL5 IDE.
From one side new language with the new abilities and from the other side - MQL4 and MQL5 compatibility. Unfortunately, these two aims cant be reached at the same time.