c++ - Enter all subfolders - Recursive -

how can write program enters of folder' subfolders?
wrote code, not enter subfolders.

void main(int argc, char *argv[]) { char* dirpath = argv[1]; struct stat statbuf; dir *dir; struct dirent *ent; size_t arglen = strlen(argv[1]);  if ((dir = opendir (dirpath)) != null) {     while ((ent = readdir (dir)) != null) {         printf(ent->d_name, "%s\n");     }     closedir (dir); } else {     perror ("problem");    } } 

i tried using stat() function recursively.

http://www.lemoda.net/c/recursive-directory/

#include <stdlib.h> #include <stdio.h> #include <sys/types.h> #include <string.h> #include <errno.h> /* "readdir" etc. defined here. */ #include <dirent.h> /* limits.h defines "path_max". */ #include <limits.h>  /* list files in "dir_name". */  static void list_dir (const char * dir_name) {     dir * d;      /* open directory specified "dir_name". */      d = opendir (dir_name);      /* check opened. */     if (! d) {         fprintf (stderr, "cannot open directory '%s': %s\n",                  dir_name, strerror (errno));         exit (exit_failure);     }     while (1) {         struct dirent * entry;         const char * d_name;          /* "readdir" gets subsequent entries "d". */         entry = readdir (d);         if (! entry) {             /* there no more entries in directory, break                out of while loop. */             break;         }         d_name = entry->d_name;         /* print name of file , directory. */     printf ("%s/%s\n", dir_name, d_name);  #if 0     /* if don't want print directories, use        following line: */          if (! (entry->d_type & dt_dir)) {         printf ("%s/%s\n", dir_name, d_name);     }  #endif /* 0 */           if (entry->d_type & dt_dir) {              /* check directory not "d" or d's parent. */              if (strcmp (d_name, "..") != 0 &&                 strcmp (d_name, ".") != 0) {                 int path_length;                 char path[path_max];                  path_length = snprintf (path, path_max,                                         "%s/%s", dir_name, d_name);                 printf ("%s\n", path);                 if (path_length >= path_max) {                     fprintf (stderr, "path length has got long.\n");                     exit (exit_failure);                 }                 /* recursively call "list_dir" new path. */                 list_dir (path);             }     }     }     /* after going through entries, close directory. */     if (closedir (d)) {         fprintf (stderr, "could not close '%s': %s\n",                  dir_name, strerror (errno));         exit (exit_failure);     } }  int main () {     list_dir ("/usr/share/games");     return 0; }