how does int main() and void main() work
This question already has an answer here:
Neither main() or void main() are standard C. The former is allowed as it has an implicit int return value, making it the same as int main() . The purpose of main 's return value is to return an exit status to the operating system.
In standard C, the only valid signatures for main are:
int main(void)
and
int main(int argc, char **argv)
The form you're using: int main() is an old style declaration that indicates main takes an unspecified number of arguments. Don't use it - choose one of those above.
If you really want to understand ANSI C 89, I need to correct you in one thing; In ANSI C 89 the difference between the following functions:
int main()
int main(void)
int main(int argc, char* argv[])
is:
int main()
int main(void)
int main(int argc, char * argv[])
About when using each of the functions
int main(void)
int main(int argc, char * argv[])
About void main()
In ANSI C 89, when using void main and compiling the project AS -ansi -pedantic (in Ubuntu, eg) you will receive a warning indicating that your main function is of type void and not of type int, but you will be able to run the project. Most C developers tend to use int main() on all of its variants, though void main() will also compile.
Hope that helps!
Good luck and happy coding
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