/*******************************************
* Compute number of days between two dates *
* ---------------------------------------- *
* Ref.: "Mathématiques par l'informatique  *
*        individuelle (1) par H. Lehning   *
*        et D. Jakubowicz, Masson, Paris,  *
*        1982" [BIBLI 06].                 *
*                                          *
*        C++ version by J-P Moreau, Paris. *
*                (www.jpmoreau.fr)         *
*******************************************/

/*****************************************************************************
 Note: The two dates must be between 01/01/1901
       and 12/31/2099 to avoid treatment of special
       "secular" years, such as 1800, 1900, 2100...
       (2000, a multiple of 400, is a normal year!)

 The first date is M, D, Y
 N, number of days between first date and fictitious
 starting date 01/00/1901, is given by formula:

       N = INT(365,25*(Y-1901)+A(M)+D)

 where A(M) is given by table below:

 M    1  2  3     4      5      6      7      8      9     10     11     12
 A(M) 0 31 59,25 90,25 120,25 151,25 181,25 212,25 243,25 273,25 304,25 334,25

       First N is saved in R.

 The second date is again M, D, Y
 N is again computed with same formula.

 Final result is N - R.
******************************************************************************/
#include <stdio.h>
#include <math.h>


        float A[13];
        short M,                     // month number
              D;                     // day number
        int   Y;                     // year number
        float N,R;                   // number of days


void Calcul() {
  scanf("%d %d %d",&M, &D, &Y);
  N = (float) 365.25 * (Y - 1901) + A[M] + D;
  N = (float) floor(N);
}


void main() {
  A[1] = 0; A[2] = 31; A[3] = 59.25; A[4] = 90.25; A[5] = 120.25; A[6] = 151.25;
  A[7] = 181.25; A[8] = 212.25; A[9] = 243.25; A[10] = 273.25; A[11] = 304.25;
  A[12] = 334.25;
  printf("\n Compute number of days between two dates\n");
  printf("     (from 01/01/1901 to 12/31/2099)\n\n");
  printf(" Enter first date (M D Y): ");
  Calcul();
  R = N;
  printf(" Enter second date (M D Y): ");
  Calcul();
  R = N - R;
  printf("\n Number of days: %6.0f\n\n\n",R);
}

//end of file ndays.cpp