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char dirname[] = "/usr/local"
DIR *dir_ptr;
struct dirent *direntp;

dir_ptr = opendir(dirname);
if (dir_ptr == NULL)
    fprintf(stderr,"Ls: can not open %s",dirname);
else
{
    direntp = readdir(dir_ptr);
    while(direntp == NULL)
        printf("%s\n",direntp->d_name);

    closedir(dir_ptr);
}

#include <windows.h>
#include <tchar.h>
#include <stdio.h>

void _tmain(int argc, TCHAR *argv[])
{
    WIN32_FIND_DATA FindFileData;
    HANDLE hFind;

    if (argc != 2)
    {
       _tprintf(TEXT("Usage: %s [target_file]\n"), argv[0]);
       return;
    }

    _tprintf (TEXT("Target file is %s\n"), argv[1]);
    hFind = FindFirstFile(argv[1], &FindFileData);
    if (hFind == INVALID_HANDLE_VALUE) 
    {
       printf ("FindFirstFile failed (%d)\n", GetLastError());
       return;
    } 
    else 
    {
       _tprintf (TEXT("The first file found is %s\n"), FindFileData.cFileName);
       FindClose(hFind);
    }
}

#include <string>
#include <iostream>
#include <filesystem>
namespace fs = std::filesystem;

int main()
{
    std::string path = "/path/to/directory";
    for (const auto & entry : fs::directory_iterator(path))
        std::cout << entry.path() << std::endl;
}