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/* The 'libkal' library for date conversion.
* Copyright (C) 1996-1998 Petr Tomasek <tomasek@etf.cuni.cz>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/*
* A (very) simple example II.
*/
#include "kal.h"
#include <string.h>
#include <stdlib.h>
const char * dw[]=
{"Sunday","Monday","Tuestday","Wendsday","Thurstday","Friday","Saturday"};
void get_date(int *d, int *m, int *y)
{
printf("Day:");
scanf("%d",d);
printf("Month:");
scanf("%d",m);
printf("Year:");
scanf("%d",y);
}
int whatdate()
{
char in[100];
while (1)
{
printf("\n\nSelect what kind of date You want to enter "
"[jul, gre, ar, jew, today]:\n");
scanf("%s",in);
if (!strcmp(in,"jul")) return 0;
if (!strcmp(in,"gre")) return 1;
if (!strcmp(in,"ar")) return 2;
if (!strcmp(in,"jew")) return 3;
if (!strcmp(in,"today")) return 4;
if (!strcmp(in,"quit")) exit(0);
if (!strcmp(in,"exit")) exit(0);
if (!strcmp(in,"x")) exit(0);
if (!strcmp(in,"q")) exit(0);
printf("Invalid choice !\n");
}
}
void main() {
int d,m,y;
long jd,jd1;
int choice;
/*
* Input:
*/
if ((choice=whatdate())<4)
{
printf("\nInput a date in the ");
switch (choice) {
case 0: printf("julianic system:\n"); break;
case 1: printf("gregorianic system:\n"); break;
case 2: printf("arabic system:\n"); break;
case 3: printf("jewish system:\n");
printf(" (NOTE that the 8th month is always 'Nisan' here,\n"
" even if the year has only 12 months!)\n");
break;
}
get_date(&d,&m,&y);
}
if (choice>3)
{
jd=kal_getdate(); /* get today's date */
}
else
/* Now , how easy: The "kal_xxx_check" function :
1) checks if the date is valid.
2) converts it from the 'choice' calendar format [see kal_procs.h]
to jd. */
if (kal_xxx_check(&jd, d, m, y,choice))
{
printf("\n Invalid date !\n");
exit(-1);
}
/*
* Output :
*/
printf("\n===============================================================================\n");
printf("Julianic date jd=%ld\t\tDay of week: %s\n",jd,dw[kal_day_of_week(jd)]);
printf("===============================================================================\n\n");
kal_conv_jd_jul(jd,&d,&m,&y);
printf("Date in Julianic system: %d.%d.%d\n",d,m,y);
jd1=kal_jul_east(y);
kal_conv_jd_jul(jd1,&d,&m,&y);
printf("(Easter sunday this year: %d.%d.%d)\n\n",d,m,y);
kal_conv_jd_gre(jd,&d,&m,&y);
printf("Date in Gregorianic system: %d.%d.%d\n",d,m,y);
jd1=kal_gre_east(y);
kal_conv_jd_gre(jd1,&d,&m,&y);
printf("(Easter sunday this year: %d.%d.%d)\n\n",d,m,y);
kal_conv_jd_ar(jd,&d,&m,&y);
printf("Date in Arabic system: %d. %s %d\n\n",d,kal_ar_months(m),y);
kal_conv_jd_jew(jd,&d,&m,&y);
printf("Date in Jewish system: %d. %s %d\n\n",d,kal_jew_months(m),y);
}
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