-
Notifications
You must be signed in to change notification settings - Fork 0
/
Main.java
49 lines (36 loc) · 1.28 KB
/
Main.java
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
import java.time.DayOfWeek;
import java.time.LocalDate;
/*
@author: mces58
Problem 19
You are given the following information, but you may prefer to do some research for yourself.
* 1 Jan 1900 was a Monday.
* Thirty days has September,
April, June and November.
All the rest have thirty-one,
Saving February alone,
Which has twenty-eight, rain or shine.
And on leap years, twenty-nine.
* A leap year occurs on any year evenly divisible by 4, but not on a century unless it is divisible by 400.
How many Sundays fell on the first of the month during the twentieth century (1 Jan 1901 to 31 Dec 2000)?
Answer : 171
*/
public class Main {
public static void main(String[] args) {
// Start date is January 1, 1901
LocalDate startDate = LocalDate.of(1901, 1, 1);
// End date is December 31, 2000
LocalDate endDate = LocalDate.of(2000, 12, 31);
// Counter is defined to count the number of Sundays
int sundays = 0;
while (!startDate.isAfter(endDate)) {
// If the day is the first of the month and the day is Sunday
if (startDate.getDayOfMonth() == 1 && startDate.getDayOfWeek() == DayOfWeek.SUNDAY) {
sundays++;
}
// Add 1 day to mark the next day
startDate = startDate.plusDays(1);
}
System.out.println(sundays);
}
}