Answer 1

Short answer, no.

Not-so-long answer, you can compile it to object files (.o) and halt there without calling the linker, but you obviously cannot run it since it isn't a complete program.

Answer 2

I think in C/C++ the compiler start executing starting with main function so without it,it won't run.

Answer 3

we can compile the C Program without main function

but while execution main function first executable statement of the program