Save list of files in array - c++11

Question

I am making a C++ program which should be able to list the files from particular directory and save each file name as a string(which will be processed further for conversion). Do I need array of strings? Which functionality should I use. The number of files is not fixed.
Main thing is I can't enter the names manually. I must accept the names from the list generated.

Answer 1

In this case you want to use a vector:
#include <vector>
#include <string>
using namespace std;
int main()
{
vector<string> file_names;
file_names.push_back("file1.txt");
file_names.push_back("file2.txt");
file_names.push_back("file3.txt");
file_names.push_back("file4.txt");
return 0;
}

Answer 2

Have you thought about using some command line tools to deal with this? Even input redirection will work for this. Example:
./Cpp < echo somedir/*
Where Cpp is the name of your compiled binary, and somedir is the directory you want to read from
Then in your c++ program, you simply use std::cin to read each filename from standard in.
#include <vector>
#include <string>
#include <iterator> // std::istream_iterator, std::back_inserter
#include <algorithm> //std::copy
#include <iostream> // std::cin
int main()
{
std::vector<string> file_names;
// read the filenames from stdin
std::copy(std::istream_iterator<std::string>(std::cin), std::istream_iterator<std::string>(), std::back_inserter(file_names));
// print the filenames
std::copy(file_names.begin(), file_names.end(), std::ostream_iterator<std::string>(std::cout, "\n"));
return 0;
}