#include <stdlib.h>
/* ... */
system("rm -r /your/directory");

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <limits.h>
#include <sys/types.h>
#include <unistd.h>
#include <dirent.h>

int removedirectoryrecursively(const char *dirname)
{
    DIR *dir;
    struct dirent *entry;
    char path[PATH_MAX];

    if (path == NULL) {
        fprintf(stderr, "Out of memory error\n");
        return 0;
    }
    dir = opendir(dirname);
    if (dir == NULL) {
        perror("Error opendir()");
        return 0;
    }

    while ((entry = readdir(dir)) != NULL) {
        if (strcmp(entry->d_name, ".") && strcmp(entry->d_name, "..")) {
            snprintf(path, (size_t) PATH_MAX, "%s/%s", dirname, entry->d_name);
            if (entry->d_type == DT_DIR) {
                removedirectoryrecursively(path);
            }

            /*
             * Here, the actual deletion must be done.  Beacuse this is
             * quite a dangerous thing to do, and this program is not very
             * well tested, we are just printing as if we are deleting.
             */
            printf("(not really) Deleting: %s\n", path);
            /*
             * When you are finished testing this and feel you are ready to do the real
             * deleting, use this: remove*STUB*(path);
             * (see "man 3 remove")
             * Please note that I DONT TAKE RESPONSIBILITY for data you delete with this!
             */
        }

    }
    closedir(dir);

    /*
     * Now the directory is emtpy, finally delete the directory itself. (Just
     * printing here, see above) 
     */
    printf("(not really) Deleting: %s\n", dirname);

    return 1;
}


int main(int argc, char *argv[])
{
    char answer[10];
    int yes, no;

    if (argc != 2) {
        fprintf(stderr, "Usage:\t%s <directory>\n", *argv);
        return 1;
    }
    do {
        printf("\nAre you sure you want to delete the entire directory %s?\n",
               argv[1]);
        fgets(answer, 5, stdin);
        yes = !strncmp(answer, "yes\n", 4);
        no = !strncmp(answer, "no\n", 3);
        if (no) {
            printf("\nexit...\n");
            return 0;
        } else if (yes) {
            /*
             * Start deleting the directory...
             */
            return !removedirectoryrecursively(argv[1]);
        } else {
            printf("\nPlease answer exactly yes or no.");
        }
    } while (!yes && !no);
    return 0;
}

    /* obsolete and possibly introduces false errors */
    if (path == NULL) {
        fprintf(stderr, "Out of memory error\n");
        return 0;
    }