#include <iostream>
#include <iomanip>
#include <fstream>
#include <string>
using namespace std;
int main (void){

	string filename;
	ifstream file;

	// Some bool variables for the do while input loop
	bool isvalid = true; // Will change to false if failing the first loop
	bool isopened = false;
	bool failedopen = false;

	do {
    if ( failedopen ){
      cout << "There was an error opening the file." << endl;
    }
    isvalid = true; // Reset for each loop

    cout << "Enter filename: ";
    cin >> filename;

    isvalid = validFilename(filename);

    // If the filename is valid, try to open the file
    if(isvalid){
      file.open(filename);

      if ( file.fail() ){
        // File was not opened
        isopened = false;
      }
      else {
        // File was opened;
        isopened = true;
      }
    }
  } while ( !isvalid || !isopened );