C++ Tutorial/Structure/structure file

writes a structure to disk and then reads it back in

<source lang="cpp">#include <iostream>

1. include <fstream>
2. 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;

}</source>