open and read write file in c++ code example

Example 1: read a file c++

// reading a text file
#include <iostream>
#include <fstream>
#include <string>
using namespace std;

int main () {
  string line;
  ifstream myfile ("example.txt");
  if (myfile.is_open())
  {
    while ( getline (myfile,line) )
    {
      //use line here
    }
    myfile.close();
  }

  else cout << "Unable to open file"; 

  return 0;
}

Example 2: write to file in C++

ofstream myfile;
myfile.open("file.txt");

myfile << "write this to file"