File Stream C++ Tutorial

#include 
#include 
#include 
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( 0 );
     cout << inout.tellg() << endl;         
     cout << inout.tellp() << endl;         
     int x = 0;                                                        
     double y = 0.0;                                                   
     string z = " ";                                                   
     inout >> x;                                                       
     inout.seekg( 8, ios::cur );                                       
     inout >> z;                                                       
     cout << x << " " << y << " " << z << endl;                        
     return 0;
}