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#include <stdio.h>
#include <stdlib.h>
int is_leap_year(int y)
{ return (y % 4 == 0 && y % 100 != 0) || (y % 400 == 0); }
int get_first_weekday(int year, int month, int days_in_month[12])
{
int beginning = 3; //1800, Jan, 1 is wedndsay (3)
for (int y = 1800; y < year; y++)
beginning += is_leap_year(y) ? 366 : 365;
for (int m = 0; m < month; m++)
beginning += days_in_month[m];
return beginning % 7;
}
void print_calendar(int year, int month)
{
month--;
const char* months[] = { "Jan","Feb","Mar","Apr","May","Jun",
"Jul","Aug","Sep","Oct","Nov","Dec" };
int days_in_month[] = { 31,28,31,30,31,30,31,31,30,31,30,31 };
if (is_leap_year(year))
days_in_month[1] = 29;
int first_week_day = get_first_weekday(year, month, days_in_month);
printf(" %s %d \n", months[month], year);
printf(" ---------------------------\n");
printf(" Sun Mon Tue Wed Thu Fri Sat\n");
for (int wkday = 0; wkday < first_week_day; wkday++)
printf(" ");
for (int day = 1; day < days_in_month[month] + 1; day++)
{
printf("%4d", day);
if(((day + first_week_day) % 7) == 0)
printf("\n");
}
printf("\n\n");
}
int main(void)
{
for(int m = 1; m < 4; m++) print_calendar(1800, m);
for (int m = 8; m <= 12; m++) print_calendar(2021, m);
return 0;
}
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