Lazy Rename

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

using namespace std;                                // Typing std:: before everything is messy and unnecessary for this kinda thing

int main()
{
    string path;                    // Path to series directory
    int startNumber;                // The index of the first episode of a folder (eg, Attack on Titan S2E1 is actually episode 26)
    string epNumberTxt;             // The current episode, including zero padding
    string seriesName;              // Name of the series
    string newFileName;             // The final assembled file name
    string fileExtension;           // Extension of the file (can probably be grabbed automatically, might do that at some point)
    int totalEpisodes;              // Used to find how many zeros to pad with

    cout << "Enter the path of your series: ";
    getline(cin, path);
    if (path[path.length() - 1] != '\\') path = path + "\\";

    cout << "Enter the series name: ";
    getline(cin, seriesName);

    cout << "Enter the video format (eg, .mkv): ";
    getline(cin, fileExtension);
    if (fileExtension[0] != '.') fileExtension = "." + fileExtension;

    cout << "Enter the number of the first episode present: ";
    cin >> startNumber;

    cout << "Enter the total number of episodes for the series: ";
    cin >> totalEpisodes;

    fstream fileNames;
    fileNames.open("Names.txt");
    vector<string> nameList;
    string line;
    while (getline(fileNames, line))
    {
        for (int i = 0; i < line.length(); i++)
        {
            if (line[i] == '\\' ||                  // Check for prohibited characters in the new file name before applying it
                line[i] == '/'  ||
                line[i] == ':'  ||
                line[i] == '*'  ||
                line[i] == '?'  ||
                line[i] == '"'  ||
                line[i] == '<'  ||
                line[i] == '>'  ||
                line[i] == '|')

                line[i] = '_';                      // Replace with underscore
        }

        nameList.push_back(line);
    }

    int iteration = 0;
    for (auto & p : fs::directory_iterator(path))   // For each file in the directory
    {
        if (nameList.size() > iteration)
        {
            if (totalEpisodes >= 100)           // If the series is 100+ episodes, 0-9 need "00", and 10-99 need "0"
            {
                if      (startNumber + iteration < 10) epNumberTxt = "00" + to_string(startNumber + iteration);
                else if (startNumber + iteration < 100) epNumberTxt = "0" + to_string(startNumber + iteration);
                else     epNumberTxt = to_string(startNumber + iteration);
            }

            else if (totalEpisodes >= 10)       // If the series is 10+ episodes, 1-9 need "0"
            {
                if   (startNumber + iteration < 10) epNumberTxt = "0" + to_string(startNumber + iteration);
                else  epNumberTxt = to_string(startNumber + iteration);
            }

            newFileName = path + seriesName + " " + epNumberTxt + " - " + nameList[iteration] + fileExtension;      // Assembles final file name, path is required else it'll be placed
            rename(p, newFileName.c_str());                                                                         // in the same folder as the program

            iteration++;
        }
    }

    cout << endl;
    system("Pause");
}