http://en.cppreference.com/w/cpp/language/main_function

main.c

#include <stdio.h>
#include <stdlib.h>

int argcorig = 0;
char **argvorig = NULL;
char **envorig = NULL;
char **arg = NULL;
char **env = NULL;

typedef void (*exitcallback) ();

void numargs()
{
    printf("The number of command-line arguments are %lu %d\n", arg - argvorig, ((arg - argvorig == argcorig)));
}

void numenvirons()
{
    printf("The number of environment variables are %lu \n", env - envorig);
}

int main(int argc, char *argv[], char *environ[])
{
    exitcallback numargsatexit = &numargs;
    exitcallback numenvironsatexit = &numenvirons;
    
    atexit(numenvironsatexit);
    atexit(numargsatexit);
    
    argcorig = argc;
    
    arg = argv;
    argvorig = argv;
    
    while (*arg != NULL) { ++arg; }
    
    env = environ;
    envorig = environ;
    
    while (*env != NULL) { ++env; }
    
    return EXIT_SUCCESS;
}