Anonymous user
Left factorials: Difference between revisions
adding Scala solution
(adding Scala solution) |
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!10000 has 35656 digits
</pre>
=={{header|Scala}}==
<lang scala>object LeftFactorial extends App {
// this part isn't really necessary, it just shows off Scala's ability
// to match the mathematical syntax: !n
implicit class RichInt(n:Int) {
def unary_!() = factorial.take(n).sum
}
val factorial: Stream[BigInt] = 1 #:: factorial.zip(Stream.from(1)).map(n => n._2 * factorial(n._2 - 1))
for (n <- (0 to 10) ++
(20 to 110 by 10);
value = !n) {
println(s"!${n} = ${value}")
}
for (n <- 1000 to 10000 by 1000;
length = (!n).toString.length) {
println(s"length !${n} = ${length}")
}
}
</lang>
{{out}}
<pre>
!0 = 0
!1 = 1
!2 = 2
!3 = 4
!4 = 10
!5 = 34
!6 = 154
!7 = 874
!8 = 5914
!9 = 46234
!10 = 409114
!20 = 128425485935180314
!30 = 9157958657951075573395300940314
!40 = 20935051082417771847631371547939998232420940314
!50 = 620960027832821612639424806694551108812720525606160920420940314
!60 = 141074930726669571000530822087000522211656242116439949000980378746128920420940314
!70 = 173639511802987526699717162409282876065556519849603157850853034644815111221599509216528920420940314
!80 = 906089587987695346534516804650290637694024830011956365184327674619752094289696314882008531991840922336528920420940314
!90 = 16695570072624210767034167688394623360733515163575864136345910335924039962404869510225723072235842668787507993136908442336528920420940314
!100 = 942786239765826579160595268206839381354754349601050974345395410407078230249590414458830117442618180732911203520208889371641659121356556442336528920420940314
!110 = 145722981061585297004706728001906071948635199234860720988658042536179281328615541936083296163475394237524337422204397431927131629058103519228197429698252556442336528920420940314
length !1000 = 2565
length !2000 = 5733
length !3000 = 9128
length !4000 = 12670
length !5000 = 16322
length !6000 = 20062
length !7000 = 23875
length !8000 = 27749
length !9000 = 31678
length !10000 = 35656
</pre>
=={{header|Seed7}}==
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