What is significance attached to the main function in C programming?

The main function in C++ is no different to any other function, other than it is the only required function; it defines the entry point of the application. The minimal main function (and therefore the minimal C++ program) is:

#include <stdio.h>

int main()

{

return(0);

}

The main function must always return an integer to the caller (even if not required by the caller). A return value of zero is usually used to indicate the program terminated successfully, however it is up to the programmer to decide what the return value actually means to the caller. It is common to return (-1) upon an unrecoverable error.