Reading data file problems!

I am trying to read in a date from a data file that looks osmething like this

10/ 2 3 / 20 0 4

I want my variables to be month = 10, day = 23, and year = 2004

Right now, it is only reading the last two numbers..so month and day are fine but year I am getting 04. Can anybody see what I'm doing wrong?

I haven't included my main function but it just opens my data file.

Code:

void process_text(istream& in_file, ofstream& out_stream)
{
  char next;
  int new_next;
  int last_digit = 0;
  int month;
  int day;
  int year;
  in_file.get(next);
  while(next != '/')
  {
   if(isdigit(next))
    {
      new_next = convert_digit(next);
      month = total_number(new_next, last_digit);
      last_digit = convert_digit(next);
      in_file.get(next);
    }
   else
      in_file.get(next);
  }

  last_digit = 0;
  
  in_file.get(next);
  while(next != '/')
  {
   if(isdigit(next))
    {
       new_next = convert_digit(next);
       day = total_number(new_next, last_digit);
       last_digit = convert_digit(next);
       in_file.get(next);
    }
   else
       in_file.get(next);
  }
   
  last_digit = 0;
      
  in_file.get(next);
  while(next != '/' && next != '\n')   
  {
   if(isdigit(next))
    {  
      new_next = convert_digit(next);
      year = total_number(new_next, last_digit);
      last_digit = convert_digit(next);
      in_file.get(next);
    }
   else
      in_file.get(next);
  }
   
cout << "the month is " << month << endl << endl;
cout << "the day is " << day << endl << endl;
cout << "the year is " << year << endl << endl; 
}
       
int convert_digit(char& number)
{
  int new_number = static_cast<int>(number) - 48;
  return(new_number);
}  
  
int total_number(int tot_num, int last_digit_par)
{
  
    return((last_digit_par * 10) + tot_num);
}

Do you have to do it yourself? Can you use stringstreams or sscanf or something instead?

Code:

      new_next = convert_digit(next);
      year = total_number(new_next, last_digit);
      last_digit = convert_digit(next);

Why don't you just change that last line to this?

Code:

last_digit = new_next;

You're calling in_file.get(next) more than you need to.

Unfortunately, I am not allowed to use the string class for this project.