accessing directories

[kohlh]

Hi I am working on boiler plate code to access a directory and push_back the file names found in that directory to a vector so that I can work with them sorting by name and extension type. Right now I am trying to get access to a folder file on my desktop so that the files inside can be stored here is the code so far.

#include<iostream>
#include<cmath>
#include<fstream>
#include<stdlib.h>
#include<string>
#include<vector>
#include<algorithm>

using namespace std;

int main()
{
	vector <string> filenames;
	char foldername [100];
	ifstream fileopen;
	cin.getline(foldername, 100);
	fileopen.open(foldername);

	if(!fileopen.is_open())
	{
		exit(EXIT_FAILURE);
	}

	string word;
	fileopen>>word;
	while(fileopen.good())
	{
		filenames.push_back(word);
		fileopen>>word;
	}
	sort(filenames.begin(),filenames.end());
	
	for(int i=0;i<filenames.size();++i)
	{
		cout<<filenames[i]<<endl;
	}



	system("pause");
	return 0;

}