Count files

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

int main(int argc, char* argv[], char* envp[])
{
    int file_count = 0, symb_links = 0;
    DIR *dirp;
    struct dirent *entry;

    if (argc != 2)
    {
        printf("invalid input!\n");
        exit(-1);
    }

    dirp = opendir(argv[1]);
    if (dirp == NULL){
        printf("Can't open the directory!\n");
        exit(-1);
    }

    while ((entry = readdir(dirp)) != NULL) {
        if (entry->d_type != DT_DIR) {
             file_count++;
        }
    }
    closedir(dirp);

    printf("Number of files = %d\n", file_count);

    return 0;
}