file_handling.cpp

#include <iostream>
#include <fstream>
using namespace std;

int main() {
  ofstream MyFile;
  // open the file
  MyFile.open("test.txt");

  MyFile << "Some text. \n";
  // close the file.
  MyFile.close();
}

Reading information from the file, line by line.

#include <iostream>
#include <fstream>
using namespace std;

int main () {
    ofstream MyFile1("test.txt");
    
    MyFile1 << "This is awesome! \n";
    MyFile1.close();

    string line;
    ifstream MyFile("test.txt");
    while ( getline (MyFile, line) ) {
        cout << line << '\n';
    }
    MyFile.close();
}