Scope error in C++

[iqbal1981]

The following code throws an error saying 'd' not in scope.

Please help.

const char* user::getDate(char* d)
{
    return d;
}
 
float user::calculate_interest(int t_accno, float t_balance)
{
  fstream file, file1;
  //float t_interest;
  int dd,mm,yy;
  file.open("bank.dat", ios::binary | ios::in);
  file.open("transaction.dat", ios::binary | ios::in);
  file.seekg(0, ios::beg);
  int d1, m1, y1, days;
  while (file.read((char *)this, sizeof(user)))
  {
    if (accountNo == t_accno)
    {
      d1 = dd;
      m1 = mm;
      y1 = yy;
      break;
    }
  }
  int d2, m2, y2;
  //struct date d;
  //time_t d = time(0);
  getDate(char *d);
  d2 = d.da_day;
  m2 = d.da_mon;
  y2 = d.da_year;
  float t_interest = 0.0;
  if((y2 < y1) || (y2==y1 && m2 < m1) || (y2==y1 && m2 == m1) && (d2 < d1))
return t_interest;
  days = no_of_days(d1, m1, y1, d2, m2, y2);
  int months = 0;
  if (days > 30)
  {
    months = days / 30;
    t_interest = ((t_balance*2)/100 * months);
  }
  file.close();
  file1.close();
  return t_interest;
}
 
int user::no_of_days(int d1, int m1, int y1, int d2, int m2, int y2)
{
  static int month[] = {31, 28, 31, 30, 31, 30, 31, 30, 31, 30, 31, 30};
  int days = 0;
  while (d1 != d2 || m1 != m2 || y1 != y2)
  {
    days++;
    d1++;
    if (d1 > month[m1-1])
    {
      d1 = 1;
      m1++;
    }
    if (m1 > m2)
    {
      m1 = 1;
      y1++;
    }
  }
  return days;
}

[Frinavale]

The variable d only exists within the getDate method. It's "scope" is only within the method because it is a parameter for the method. You should probably research the topic of scope because it is very useful and will help you to understand the lifetime and accessibility of variables.

You are getting this error message because you are attempting to use use the d variable outside of the getDate method.

If you replace d with the variable that you pass in to the getDate method, it will fix the problem.

-Frinny