#include        <stdio.h>
#include        <dirent.h>

void main(int argc,char *argv[])
{
DIR     *dir;
struct  dirent   *dp;
char    path[512];

    if(argc<=1){
        strcpy(path,".");
    }
    else{
        strcpy(path,argv[1]);
    }
    if((dir=opendir(path))==NULL){
        perror("opendir");
        exit(-1);
    }
    for(dp=readdir(dir);dp!=NULL;dp=readdir(dir)){
        printf("%s\n",dp->d_name);
    }
    closedir(dir);
}