Question

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Can you print anything in C++, before entering into the main function?

Is there any possibility to run any other instructions before int main() is invoked?

int main(){cout<<"a";}

and before that call in main() there is call for cout<<“b”; somewhere before. Maybe this #define thing can help.

Answer 1

You don’t need a define. Just create a global object (in the same file) and its ctor (or anything else you use to initialize it, such as calling a function) will run before main is invoked.

Edit: likewise, those global objects will be destroyed after main exits, so their destructors will run at that time.