Function main()
Each program file must contain a basic main() function.
This function is called when the program starts. Like all C++ functions, its contents are enclosed in curly brackets.
General structure
int main()
{
// function's body enclosed in curly brackets
return 0;
}
To be able to get data from outside the program, there are two options - getting the arguments with which the program is running (run_cpp("get_args",...)) and getting the values of external variables initiated by other programs (var_extern_get).