/* This program shows you how to do file I/O with C++. */

#include <fstream>   // include fstream declaration 
#include <iostream>
#include <cstdlib>   // include standard library 
#include <vector>
using namespace std;

int main()
{
  size_t const MAX = 128;
  vector<double> a(128, 2.0E0);  // a vector, assign all elements 
                                 // the value of 2.0E0


  ofstream dest("matrix.dat");  // ofstream -> output file 
  if (!dest) {                  // check if matrix.dat opened
    cerr << "Cannot open file matrix.dat" << endl;
    exit(1);                    // if not, exit 
  }

  for (size_t i = 0; i != MAX; ++i)
    dest << a[i] << ' ';
  dest << endl;                // end final record 

  dest.close();                // close matrix.dat
}