File management - system call

Program

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

struct dirent *dptr;

int main() {

  char buff[100];
  DIR *dirp;

  printf("\n\n ENTER THE DIRECTORY NAME");
  scanf("%s",buff);

  if((dirp=opendir(buff))==NULL) {
    printf("the given directory does not exist");
    exit(1);
  }

  while(dptr=readdir(dirp)) {
    printf("%s\n",dptr->d_name);
  }

  closedir(dirp);
}