Thread: trouble passing parameter to function

I'm having some difficulty compiling the following code. When I run

Code:

 void list_dir (char * dir_name)
{
    DIR * d;
    d = opendir (dir_name);
.....
}

int main (int argc, char *argv[])
{     
   list_dir (argv[1]);
    return 0;
}

my program compiles without issue, but when I try to pass a second parameter to the function of either argv[2] or *argv, the compiler is telling me too few parameters to function or expecting * when parameter is **, an example is....

Code:

void
list_dir (char * dir_name, char * newz)
{
    DIR * d;
  d = opendir (dir_name);
.....
}

int main (int argc, char *argv[])
{
    list_dir (argv[1], argv[2]);
    return 0;
}

Any suggestions on why the compiler doesn't accept how the second argument, argv[2], is being passed. Thanks!