Question

Where do we write main function in a c program?

Answer 1

it has a return type (and in some cases accepts inputs via parameters). The only difference is that the main function is "called" by the operating system when the user runs the program.

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Answer 2

As per C/C++ standard, main() is the starting point of any program in a hosted environment where a program uses the facilities of an operating system. But in a freestanding environment, where a program execution may take place without the benefit of an operating system, the starting point need not be main() .