#define _CRT_SECURE_NO_WARNINGS 1
#define MAX_PATH_LENGTH  64*1024
#define MAX_CURRENT_FOLDER_LENGTH  1024
#include "windows.h"
#include <stdio.h>

char dir[MAX_PATH_LENGTH] = "";
int fileQty = 0;
long long folderSize = 0;

void walkDir(char *Dir, int deep){
    char currentDirName[MAX_CURRENT_FOLDER_LENGTH] = "";
    int cutX = 0;
    int folder_is_end = 555; //если дошли до конца , то 0, а сначала не дошли (555)
    if (strlen(dir)==0) strcpy(dir, Dir);
    strcat(dir, "*");
    WIN32_FIND_DATA FindFileData;
    HANDLE hf;
    hf = FindFirstFileA(dir, &FindFileData);
    if (hf != INVALID_HANDLE_VALUE) {
        while (folder_is_end != 0) {
            while ((folder_is_end = FindNextFileA(hf, &FindFileData)) != 0) {
                if (strcmp(FindFileData.cFileName, ".") == 0 || strcmp(FindFileData.cFileName, "..") == 0) continue;
                if (FindFileData.dwFileAttributes == FILE_ATTRIBUTE_DIRECTORY) break;
                //printf("%s \n", FindFileData.cFileName);
                fileQty++;
                folderSize = folderSize + FindFileData.nFileSizeLow;
            }
            if (folder_is_end != 0) {
                dir[strlen(dir) - 1] = '\0'; //убираем звездочку справа
                strcpy(currentDirName, FindFileData.cFileName);
                strcat(dir, currentDirName);
                strcat(dir, "/");
                walkDir(dir,deep+1);
                dir[strlen(dir) - 1] = '\0'; //убираем звездочку справа
                dir[strlen(dir) - 1] = '\0'; //и слеш
                cutX = strlen(dir) - strlen(currentDirName) ;
                dir[cutX] = '\0'; 
                strcat(dir, "*");
            }
        }
    } 
 }

int main(int argc, char* argv[]){
    walkDir("C:/windows/",0);
    printf("Number of files: %d\n", fileQty);
    printf("Total size: %d\n", folderSize);
}