/*************************************************************************************************************************************/
/*                                                                                                                                   */
/*        T E S T   D U   P R O B L E M E   'v $xiii/aleat.2$vv$FON 20080924174528'  :                                               */
/*                                                                                                                                   */
/*                                                                                                                                   */
/*        Author of '$xtc/noeud.11$c' :                                                                                              */
/*                                                                                                                                   */
/*                    Jean-Francois Colonna (LACTAMME, 20080925162951).                                                              */
/*                                                                                                                                   */
/*************************************************************************************************************************************/

#include  <stdio.h>

typedef   union     di        {
                              double    d;
                              struct    i         {
                                                  int       i1;
                                                  int       i2;
                                                  }         i;
                              }         di;

#define   edit(x,message)                                                                                                               \
                    {                                                                                                                   \
                    printf("%s=%.18f --> {%08x,%08x}",message,d(x),i(x),j(x));                                                          \
                    printf("\n");                                                                                                       \
                    }

#define   d(x)      (x.d)
#define   i(x)      (x.i.i2)
#define   j(x)      (x.i.i1)

int       IFLE(x,y)
double    x;
double    y;
          {
          return((x) <= (y));
          }

int       IFGT(x,y)
double    x;
double    y;
          {
          return((x) > (y));
          }

#define   INCR(x,i) x = ((x)+(i))
#define   SOUS(x,y) ((x)-(y))
#define   DECR(x,i) x = SOUS(x,i)

main()
          {
          int       chercher_le_noeud=1;
          di        coordonnee_d_un_point;
          di        maille;
          di        coordonnee_du_centre;
          di        coordonnee_du_noeud;

          i(coordonnee_d_un_point)=0x3fd99999;j(coordonnee_d_un_point)=0x9999999a;
          i(maille)=0x3fb99999;j(maille)=0x9999999a;
          i(coordonnee_du_centre)=0x00000000;j(coordonnee_du_centre)=0x00000000;
          i(coordonnee_du_noeud)=i(coordonnee_du_centre);j(coordonnee_du_noeud)=j(coordonnee_du_centre);

          edit(coordonnee_d_un_point,"point");
          edit(maille,"maille");
          edit(coordonnee_du_centre,"centre");
          edit(coordonnee_du_noeud,"noeud");

          while     (chercher_le_noeud == 1)
                    {
                    if        (IFGT(d(coordonnee_du_noeud),d(coordonnee_d_un_point)))
                              {
                              DECR(d(coordonnee_du_noeud),d(maille));
                              edit(coordonnee_du_noeud,"DECR(noeud)");
                              }
                    else
                              {
                              if        (IFLE(d(coordonnee_du_noeud),SOUS(d(coordonnee_d_un_point),d(maille))))
                                        {
                                        INCR(d(coordonnee_du_noeud),d(maille));
                                        edit(coordonnee_du_noeud,"INCR(noeud)");
                                        }
                              else
                                        {
                                        chercher_le_noeud=0;
                                        }
                              }
                    }

          edit(coordonnee_du_noeud,"noeud");
                                        /* Le 20080925162951, on note les resultats suivants :                                       */
                                        /*                                                                                           */
                                        /*                  point=0.400000000000000022               --> {3fd99999,9999999a}         */
                                        /*                  maille=0.100000000000000006              --> {3fb99999,9999999a}         */
                                        /*                  centre=0.000000000000000000              --> {00000000,00000000}         */
                                        /*                  noeud=0.000000000000000000               --> {00000000,00000000}         */
                                        /*                  INCR(noeud)=0.100000000000000006         --> {3fb99999,9999999a}         */
                                        /*                  INCR(noeud)=0.200000000000000011         --> {3fc99999,9999999a}         */
                                        /*                  INCR(noeud)=0.300000000000000044         --> {3fd33333,33333334}         */
                                        /*                  INCR(noeud)=0.400000000000000022         --> {3fd99999,9999999a}         */
                                        /*                  noeud=0.400000000000000022               --> {3fd99999,9999999a}         */
                                        /*                                                                                           */
                                        /* sur toutes les MACHINEs apparemment...                                                    */
          }



Copyright © Jean-François Colonna, 2021-2021.
Copyright © CMAP (Centre de Mathématiques APpliquées) UMR CNRS 7641 / Ecole Polytechnique, 2021-2021.