Test File Position : file pointer « File Stream « C++ Tutorial

1. C++ Tutorial
2. File Stream
3. file pointer

#include <fstream>
#include <string>
#include <iostream>

using namespace std;

int main() {
    fstream inout( "invoice.dat", ios::in | ios::out );                      

    inout << 1234 << " " << 56.78 << " " << "apples" <<'\n';                 

    cout << inout.tellg() << endl;                                      

    cout << inout.tellp() << endl;                                      

    inout.seekg( ios::beg );                                            

    cout << inout.tellg() << endl;                                      
    
    cout << inout.tellp() << endl;                                      
    int x;
    double y;
    string z;

    inout>> x >> y;                                                     
    inout >> z;                                                              
    cout << x << " " << y << " " << z << endl;                               
    return 0;
}