C - C++ Files - Randomly Accessed File

#include <iostream>
using std::cerr;
using std::endl;
using std::ios;
 
#include <fstream>
using std::ofstream;
 
#include <cstdlib>
using std::exit;
 
#include <string>
using std::string;
 
class Account
{
public:
  Account( int accountNumberValue, string lastNameValue, string firstNameValue, double balanceValue )
  {
    setAccountNumber( accountNumberValue );
    setLastName( lastNameValue );
    setFirstName( firstNameValue );
    setBalance( balanceValue );
  }
 
  int getAccountNumber() const
  {
    return accountNumber;
  }
 
  void setAccountNumber( int accountNumberValue )
  {
    accountNumber = accountNumberValue; // should validate
  }
 
  string getLastName() const
  {
    return lastName;
  }
 
  void setLastName( string lastNameString )
  {
    const char *lastNameValue = lastNameString.data();
    strncpy( lastName, lastNameValue, 5 );
    lastName[ 5 ] = '\0';
  }
 
  string getFirstName() const
  {
    return firstName;
  }
 
  void setFirstName( string firstNameString )
  {
    const char *firstNameValue = firstNameString.data();
    strncpy( firstName, firstNameValue, 5 );
    firstName[ 5 ] = '\0';
  }
 
  double getBalance() const
  {
    return balance;
  }
 
  void setBalance( double balanceValue )
  {
    balance = balanceValue;
  }
 
private:
  int accountNumber;
  char lastName[ 15 ];
  char firstName[ 10 ];
  double balance;
};
 
 
int main()
{
  ofstream outCredit( "credit.dat", ios::binary );
 
  if ( !outCredit )
  {
    cerr << "File could not be opened." << endl;
    exit( 1 );
  }
 
  Account blankClient(1,"AAAAA","BBBBB",1.2);
 
  // output 100 blank records to file
  for ( int i = 0; i < 100; i++ )
    outCredit.write( reinterpret_cast< const char * >( &blankClient ), sizeof( Account ) );
 
  return 0;
}