writes a structure to disk and then reads it back in : structure file « Structure « C++ Tutorial

1. C++ Tutorial
2. Structure
3. structure file

#include <iostream>
#include <fstream>
#include <cstring>
using namespace std;
   
struct status {
  char name[80];
  double balance;
  unsigned long account_num;
};
   
int main()
{
  struct status acc;
   
  strcpy(acc.name, "A");
  acc.balance = 1.23;
  acc.account_num = 34;
   
  ofstream outbal("balance", ios::out | ios::binary);
  if(!outbal) {
    cout << "Cannot open file.\n";
    return 1;
  }
   
  outbal.write((char *) &acc, sizeof(struct status));
  outbal.close();
   
  // now, read back;
  ifstream inbal("balance", ios::in | ios::binary);
  if(!inbal) {
    cout << "Cannot open file.\n";
    return 1;
  }
   
  inbal.read((char *) &acc, sizeof(struct status));
   
  cout << acc.name << endl;
  cout << "Account # " << acc.account_num;
  cout.precision(2);
  cout.setf(ios::fixed);
  cout << endl << "Balance: $" << acc.balance;
   
  inbal.close();
  return 0;
}