int main()

Question

when int main() function is called ?

Answer 1

When you execute a C or C++ program, the runtime system starts your program by calling its main()function first.
The main() function then calls all the other functions required to run your program.
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Answer 2

The "main()" function in your class is get called whenever you execute your program , in fact for the execution of your program first the main() method is searched for execution .