import java.time.{LocalDate, DayOfWeek}
/*
This program determines the day of the week for January 1st of a given year.
Approach:
---------
Scala uses the Java Time API for date/time handling:
- LocalDate.of(year, month, day) : constructs a calendar date
- getDayOfWeek() : returns a DayOfWeek enum
DayOfWeek values:
MONDAY, TUESDAY, WEDNESDAY, THURSDAY,
FRIDAY, SATURDAY, SUNDAY
This avoids manual calendar arithmetic and uses efficient built‑in routines.
*/
// Convert DayOfWeek enum to a readable string
def weekdayName(dow: DayOfWeek): String =
dow.toString.toLowerCase.capitalize
// Compute weekday of January 1st for a given year
def jan1Weekday(year: Int): String = {
val dateValue: LocalDate = LocalDate.of(year, 1, 1) // January 1st of given year
val dow: DayOfWeek = dateValue.getDayOfWeek // Built‑in weekday computation
weekdayName(dow)
}
@main def run(): Unit = {
val year: Int = 2026
val result: String = jan1Weekday(year)
println(s"January 1st, $year falls on a $result.")
}
/*
run:
January 1st, 2026 falls on a Thursday.
*/
