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C++ is the standard language used to program the Arduino IDE. However, the Arduino IDE does have lots of libraries built in, so functions such as "main" are not called directly in the sketch code. Most Arduino code online is written in this language.

4 votes

Error: Function not declared in the scope

Because in the call: dofun(); you should put from which class you are calling that function. In your case: AllTimer::dofun(); in that case your function must be declared as static method. EDIT …
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