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19.go
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19.go
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package main
import (
"time"
"fmt"
//"github.com/trevorgk/project-euler/eulerlib"
)
/*
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)?
*/
func euler_19 () {
result := 0;
date := time.Date(1901,time.January,1, 0, 0, 0, 0, time.UTC)
for date.Weekday() != time.Sunday {
date = date.Add(time.Hour * 24)
}
for ; date.Year() < 2001; date = date.Add(time.Hour * 24 * 7) {
if date.Weekday() == time.Sunday && date.Day() == 1 {
result++
//fmt.Println(date);
}
}
fmt.Println("There were", result, "Sundays on the first day of the month in the twentieth century")
return
}