// test_file_io.cpp   create a file, write file, close, open, read file

#include <fstream>                       // this should also includes in iostream
#include <iostream>                      // but don't count on it, yet
#include <string>                        // for input buffer

using namespace std;                     // bring standard names into scope

int main(int argc, char *argv[])         // standard main program definition
{
  fstream my_io;                         // a users variable that holds stream information
  string word;                           // just a place for inputting
  
  cout << "test_file_io running" << endl;// just let user know the program is executing 
  
  my_io.open("junk_file", ios::out);     // creates file if necessary and opens file
  if(!my_io)                             // believe it!, anything can go wrong
  {
    cout << "can not open junk_file for writing" << endl;  // common error message
    return 1;                                              // common error exit
  }
  
  my_io << "Some text" ;                 // write to the file named "junk_file"
  my_io << 42;                           // write more
  my_io << "more text" << endl;          // finish a line, '\n' new line character written
  my_io << "line 2" << endl;
  
  my_io.flush();                         // force file to disk. Do not do this for scratch files.
  my_io.close();                         // close the file
  
  cout << "junk_file written" << endl;   // file should be written

  my_io.open("junk_file", ios::in);      // open an existing file for reading
  if(!my_io)                             // believe it!, anything can go wrong
  {
    cout << "can not open junk_file for reading" << endl;  // common error message
    return 1;                                              // common error exit
  }

  // notice that character translation is taking place, each word is input, not a line
  my_io >> word;
  cout << word;
  my_io >> word;
  cout << word;
  my_io >> word;
  cout << word;
  my_io >> word;
  cout << word;
  my_io >> word;
  cout << word;
  
    // output is: 
    //   Sometext42moretextline2
    //
    // But junk_file contains:          Note no space around '42', five(5) "words"
    //    Some text42more text
    //    line 2

  
  // no string my_io.get(word, 70);
  cout << word;
  // no my_io.getline(word);
  cout << word;
  
  my_io.close();                         // just being neat, closing file being read
  return 0;
}