Brief examples of file I/O

NOTE : -

THIS CONTENT IS NOT ORIGINAL

31. Brief examples of file I/O

Let's talk about input/output. In C++ that's a very broad subject.

Here is a program that writes to a file:

using namespace std;
#include 
#include 

int main ()
{
  fstream f;

  f.open("test.txt", ios::out);

  f << "This is a text output to a file." << endl;

  double a = 345;

  f  << "A number: " << a << endl;

  f.close();

  return 0;
}

Content of file test.txt

This is a text output to a file. A number: 345

Here is a program that reads from a file:

using namespace std;
#include 
#include 

int main ()
{
  fstream f;
  char c;

  cout << "What's inside the test.txt file" << endl;
  cout << endl;

  f.open("test.txt", ios::in);

  while (! f.eof() )
  {
     f.get(c);                          // Or c = f.get()
     cout << c;
  }

  f.close();

  return 0;
}

Output

This is a text output to a file. A number: 345

BIBILOGRAPHY / REFERENCE : - http://www.4p8.com/eric.brasseur/cppcen.html