how can i create a checkindat file for c to read from a file

how can i create a checkin.dat file for c++ to read from a file.

Solution

// writing on a .dat file
#include <iostream>
#include <fstream>
using namespace std;

int main () {
   string input;
   // creating checkin.dat file
   cout<<\"Creating and writing into file:\"<<endl;
   ofstream my_file (\"checkin.dat\");// ofstream for file open
   if (my_file.is_open()) {
           cout<<\"Enter string to write into file:\";
cin>>input;
           my_file << input;// writing into file
           my_file.close();// closing file
           }
       else cout << \"Unable to open file\";
// oepining checkin.dat file
cout<<\"\ \ Reading from file:\ \"<<endl;

ifstream myfile (\"checkin.dat\");
string line;
if (myfile.is_open()){
       while ( getline (myfile,line) ) // reading line by line
       {
           cout <<\"File output line by line:\ \"<<line <<endl;// printing line
       }
myfile.close(); // closing
}
  
  
getchar();
return 0;
}