Answer to Question #181858 in C++ for virushka

Question

Create separate program file for each mode.

1. ios:: app
2. ios::ate
3. ios::binary
4. ios::in
5. ios::nocreate
6. ios::noreplace
7. ios::out
8. ios::trunc
9. Result file

:

Answer 1

// writing on a text file using ios::app
#include <iostream>
#include <fstream>
using namespace std;

int main () {
  ofstream myfile ("example.txt", ios::app);
  if (myfile.is_open())
  {
    myfile << "This is a line.\n";
    myfile << "This is another line.\n";
    myfile.close();
  }
  else cout << "Unable to open file";
  return 0;
}
// writing on a text file using ios::ate
#include <iostream>
#include <fstream>
using namespace std;

int main () {
  ofstream myfile ("example.txt", ios::ate);
  if (myfile.is_open())
  {
    myfile << "This is a line.\n";
    myfile << "This is another line.\n";
    myfile.close();
  }
  else cout << "Unable to open file";
  return 0;
}
// writing on a text file using ios::binary
#include <iostream>
#include <fstream>
using namespace std;

int main () {
  ofstream myfile ("example.txt", ios::binary);
  if (myfile.is_open())
  {
    myfile << "This is a line.\n";
    myfile << "This is another line.\n";
    myfile.close();
  }
  else cout << "Unable to open file";
  return 0;
}
// reading a text file using ios::in
#include <iostream>
#include <fstream>
#include <string>
using namespace std;

int main () {
  string line;
  ifstream myfile ("example.txt", ios::in);
  if (myfile.is_open())
  {
    while ( getline (myfile,line) )
    {
      cout << line << '\n';
    }
    myfile.close();
  }

  else cout << "Unable to open file"; 

  return 0;
}
// writing on a text file using ios::nocreate
#include <iostream>
#include <fstream>
using namespace std;

int main () {
  ofstream myfile ("example.txt", ios::nocreate);
  if (myfile.is_open())
  {
    myfile << "This is a line.\n";
    myfile << "This is another line.\n";
    myfile.close();
  }
  else cout << "Unable to open file";
  return 0;
}
// writing on a text file using ios::noreplace
#include <iostream>
#include <fstream>
using namespace std;

int main () {
  ofstream myfile ("example.txt", ios::noreplace);
  if (myfile.is_open())
  {
    myfile << "This is a line.\n";
    myfile << "This is another line.\n";
    myfile.close();
  }
  else cout << "Unable to open file";
  return 0;
}
// writing on a text file usiong ios::out
#include <iostream>
#include <fstream>
using namespace std;

int main () {
  ofstream myfile ("example.txt", ios::out);
  if (myfile.is_open())
  {
    myfile << "This is a line.\n";
    myfile << "This is another line.\n";
    myfile.close();
  }
  else cout << "Unable to open file";
  return 0;
}
// writing on a text file using ios::trunc
#include <iostream>
#include <fstream>
using namespace std;

int main () {
  ofstream myfile ("example.txt", ios::trunc);
  if (myfile.is_open())
  {
    myfile << "This is a line.\n";
    myfile << "This is another line.\n";
    myfile.close();
  }
  else cout << "Unable to open file";
  return 0;
}