関連ワード:  int main() vs int main(void)    int main () vs int main void    int main () vs int main void in c    int main () or int main void    is int main () and int main void the same    difference between int main () and int main void    difference between int main () and int main void in c    int main () vs void main () meaning    int main vs void main difference    int main vs void main with example