Difference between int main() and int main(void)?

Question

Many a times in C we get these two type of main function one had void as parameter one has none. Now the question is what is the difference between these two?

Answer 1

There is no difference between function having void as a parameter and a function having nothing as a parameter both of the function are design to accept nothing i.e no value .if a function which is does not accept any value by default it is void only

Comments

in C, int main() can be called with any number of arguments, but int main(void) can only be called without any argument. Although it doesn’t make any difference most of the times, using “int main(void)” is a recommended practice in C.

Answer 2

Technically there is no difference between int main() and int main(void). In both the cases we can not have any parameter but recommended practice is to use void when there is no command line parameter. Check the following list of parameters passed to the main function.

1. int main ( void ) /* No argument and You have to mention void */

2. int main ( int argc, char *argv[] ) /* Two argument - 
                                          argc: argument count, 
                                          argv: contains the list of parameters */

3. int main ( int argc, char *argv[], char **env ) /* Three argument -
                                                   argc: argument count, 
                                                   argv: contains the list of parameters 
                                                   env: environment variables */