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Find the last Sunday of each month: Difference between revisions
Find the last Sunday of each month (view source)
Revision as of 21:25, 12 September 2016
, 7 years agoAdded F# version
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</pre>
=={{header|F_Sharp|F#}}==
<p>We use a transformation from and to the Julian Day Number, see also PARI/GP or Fortran.</p>
<p>The formulars used here come from [http://calendars.wikia.com/wiki/Julian_day_number] (section "Calculation").</p>
<lang fsharp>let jdn (year, month, day) =
let a = (14 - month) / 12
let y = year + 4800 - a
let m = month + 12 * a - 3
day + (153*m+2)/5 + 365*y + y/4 - y/100 + y/400 - 32045
let date_from_jdn jdn =
let j = jdn + 32044
let g = j / 146097
let dg = j % 146097
let c = (dg / 36524 + 1) * 3 / 4
let dc = dg - c * 36524
let b = dc / 1461
let db = dc % 1461
let a = (db / 365 + 1) * 3 / 4
let da = db - a * 365
let y = g * 400 + c * 100 + b * 4 + a
let m = (da * 5 + 308) / 153 - 2
let d = da - (m + 4) * 153 / 5 + 122
(y - 4800 + (m + 2) / 12, (m + 2) % 12 + 1, d + 1)
[<EntryPoint>]
let main argv =
let year = System.Int32.Parse(argv.[0])
[for m in 1..12 do yield jdn (year,m+1,0)]
|> List.map (fun x -> date_from_jdn (x - (x+1)%7))
|> List.iter (printfn "%A")
0</lang>
{{out}}
<pre>RosettaCode 2016
(2016, 1, 31)
(2016, 2, 28)
(2016, 3, 27)
(2016, 4, 24)
(2016, 5, 29)
(2016, 6, 26)
(2016, 7, 31)
(2016, 8, 28)
(2016, 9, 25)
(2016, 10, 30)
(2016, 11, 27)
(2016, 12, 25)</pre>
=={{header|Fortran}}==
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