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p19.c
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p19.c
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#include <stdio.h>
int is_leap_year(int year)
{
return (year % 4 == 00 && year % 100 != 0) || year % 400 == 0;
}
int days_in_month(int month, int year)
{
if (month == 4 || month == 6 || month == 9|| month == 11) {
return 30;
}
else if (month == 2) {
if (is_leap_year(year))
return 29;
else
return 28;
}
else {
return 31;
}
}
int main()
{
int day = 1;
int days;
int month = 1;
int year = 1901;
int count = 0;
int weekday = 1; // 1 = Tuesday (1st Jan 1901)
for (year; year < 2001; year++) {
for (month; month < 13; month++) {
days = days_in_month(month, year);
for (day; day <= days; day++) {
if (day == 1 && weekday == 6)
count++;
weekday = (weekday + 1) % 7;
}
day = 1;
}
month = 1;
}
printf("%d\n", count);
return 0;
}