Save and read double array in a binary file : ofstream « File Stream « C++ Tutorial

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C++ Tutorial » File Stream » ofstream

12.10.6.Save and read double array in a binary file

#include <iostream>

#include <fstream>

using namespace std;



int main()

{

  double fnum[4] = {9.5, -3.4, 1.0, 2.1};

  int i;



  ofstream out("numbers", ios::out | ios::binary);

  if(!out) {

    cout << "Cannot open file.";

    return 1;

   }



  out.write((char *) &fnum, sizeof fnum);



  out.close();



  for(i=0; i<4; i++) // clear array

    fnum[i] = 0.0;



  ifstream in("numbers", ios::in | ios::binary);

  in.read((char *) &fnum, sizeof fnum);



  // see how many bytes have been read

  cout << in.gcount() << " bytes read\n";



  for(i=0; i<4; i++) // show values read from file

  cout << fnum[i] << " ";



  in.close();



  return 0;

}

32 bytes read
9.5 -3.4 1 2.1 "

12.10.ofstream
	12.10.1.	Save char array to a file
	12.10.2.	Read char array from a file
	12.10.3.	Writing on a text file
	12.10.4.	Writing numbers to a file
	12.10.5.	ofstream: seek from beginning
	12.10.6.	Save and read double array in a binary file
	12.10.7.	Save and read structure
	12.10.8.	Save chars to a binary file
	12.10.9.	Demonstrate peek(), unget(), and ignore().
	12.10.10.	Create a sequential file.

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