#include<stdio.h>

form_jday( year, jd, mon, day)
  int   year, jd, *mon, *day;
{

      int  i, j, k,skip;


      skip = 1;
      for(i=0; i<500; i++) if(year == 4*i){ 
         skip = 0;
         break;
      }

      j = 0;
         for(i=1; i<=12; i++){
             k = j;
             if(i==2 && skip == 0 ) j = j+29;
             else if(i==2 && skip == 1 ) j = j+28;
             else if(i==4 || i==6 || i==9 || i==11 ) j = j+30;
             else  j = j+31;  
             if( jd >k && jd <=j ) {
               *mon = i;
                break;
             }
         }
         for(j=1; j+k<jd; j++); 
             *day = j;
              
}

to_jday( year, mon, day, jd)
      int   year, mon, day, *jd;
{

      int  i, j, k, skip;


      skip = 1;
      for(i=0; i<500; i++) if(year == 4*i){
         skip = 0;
         break;
      }

      j = 0;
      for(i=1; i<mon; i++){
             if(i==2 && skip == 0 ) j = j+29;
             else if(i==2 && skip == 1 ) j = j+28;
             else if(i==4 || i==6 || i==9 || i==11 ) j = j+30;
             else  j = j+31;
      }
      for(i=1; i<day; i++);
             *jd = j+i;

}