# include <cstdlib>
# include <iostream>
# include <ctime>

using namespace std;

int main ( )
//
//  DAY_COUNT counts the number of days from some point in the past to today.
//
//  Using this program, you can find out how many days old you are.
//
{
  int y, m, d;
  int y1, m1, d1;
  int y2, m2, d2;
  int days;
  int month_length ( int m, int y );
  int now_year ( );
  int now_month ( );
  int now_day ( );

  cout << "Enter Year Month Day as integers: ";
  cin >> y1 >> m1 >> d1;

  y2 = now_year ( );
  m2 = now_month ( );
  d2 = now_day ( );

  cout << "  Then = " << y1 << "/" << m1 << "/" << d1 << "\n";
  cout << "  Today = " << y2 << "/" << m2 << "/" << d2 << "\n";

  days = 0;
  y = y1;
  m = m1;
  d = d1;

  while ( y < y2 || m < m2 || d < d2 )
  {
    days = days + 1;

    d = d + 1;
    if ( month_length ( m, y ) < d )
    {
      d = 1;
      m = m + 1;
    } 

    if ( 12 < m )
    {
      m = 1;
      y = y + 1;
    }
  }

  cout << "  Number of days is " << days << "\n";

  return 0;
}
int month_length ( int m, int y )
//
//  MONTH_LENGTH returns the length of the month M, in year Y.
//
{
  bool leap_year ( int y );
  int value;

  if ( m == 4 || m == 6 || m == 9 || m == 11 )
  {
    value = 30;
  }
  else if ( m == 1 || m == 3 || m == 5 || m == 7 || m == 8 || m == 10 || m == 12 )
  {
    value = 31;
  }
  else
  {
    if ( leap_year ( y ) )
    {
      value = 29;
    }
    else
    {
      value = 28;
    }
  }
  return value;
}
bool leap_year ( int y )
//
//  LEAP_YEAR returns TRUE if the year Y was a leap year.
//
{
  bool value;

  if ( y % 4 != 0 )
  {
     value = false;
  }
  else if ( y % 400 == 0 )
  {
     value = true;
  }
  else if ( y % 100 == 0 )
  {
     value = false;
  }
  else
  {
     value = true;
  }
  return value;
}
int now_day ( )
//
//  NOW_DAY returns the day of the month for today.
//
{
  const struct tm *tm_ptr;
  time_t now;
  int value;

  now = time ( 0 );
  tm_ptr = localtime ( &now );

  value = tm_ptr->tm_mday;

  return value;
}
int now_month ( )
//
//  NOW_MONTH returns the month number for today.
//
{
  const struct tm *tm_ptr;
  time_t now;
  int value;

  now = time ( 0 );
  tm_ptr = localtime ( &now );

  value = 1 + tm_ptr->tm_mon;

  return value;
}
int now_year ( )
//
//  NOW_YEAR returns the year for today.
//
{
  const struct tm *tm_ptr;
  time_t now;
  int value;

  now = time ( 0 );
  tm_ptr = localtime ( &now );

  value = 1900 + tm_ptr->tm_year;

  return value;
}