#include <iostream>
#include <fstream>
#include <string>
using namespace std;

#define MAX_LINE_LEN 1024 // really big!

int main () {
  string filename;
  cout << "Enter input filename: ";
  cin >> filename;
  ifstream myfile (filename.c_str());
  char line[MAX_LINE_LEN]; 
  
  if (!myfile.is_open()) {
    cout << "Unable to open file " << filename;
    return -1;    
  }
  while ( myfile.getline (line, MAX_LINE_LEN) )
    cout << line << '\n';   
  myfile.close();  
}