Материал из C\C++ эксперт
writes a structure to disk and then reads it back in
#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;
}
