- 追加された行はこの色です。
- 削除された行はこの色です。
*Scala解答例 [#p9ba346f]
[[練習問題]]
解答例は次の環境でテストしています
-Scala 2.10.2
-Java 1.7.0_21 32bit
-sbt 0.12.4
ほとんどの解答例は[[ideone.com:http://ideone.com/]]でそのまま実行できます
つっこみは[[Top>/]]の避難所まで
#contents
**[[ループ練習>練習問題#eb2c4338]] [#s1c6b422]
***問1 [#ke7969de]
object Main extends App {
for (i <- 1 to 5) {
println("Hello World!")
}
}
別解
object Main extends App {
(1 to 5) foreach { _ =>
println("Hello World!")
}
}
***問2 [#ybb0b896]
object Main extends App {
val j = args(0).toInt
for (i <- 1 to j) {
println("Hello World! " + i)
}
}
別解
object Main extends App {
val j = args(0).toInt
(1 to j) foreach { i =>
println("Hello World! " + i)
}
}
**[[FizzBuzz>練習問題#t52e5a48]] [#ga808233]
object Main extends App {
def fizzBuzz(n: Int) =
if (n % 15 == 0) {
"FizzBuzz"
} else if (n % 5 == 0) {
"Buzz"
} else if (n % 3 == 0) {
"Fizz"
} else {
n.toString
}
(1 to 100).map(fizzBuzz).foreach(println)
}
**[[素数判定>練習問題#o8db2119]] [#ldc71efe]
***判定 [#v8e35b34]
object Main extends App {
def prime(n: Int) =
2 <= n && !(2 until (math.sqrt(n) + 1.0).toInt).exists(n % _ == 0)
val n = args(0).toInt
println(n.toString + "は" + (if (prime(n)) "素数" else "非素数"))
}
***列挙 [#j53b2078]
object Main extends App {
def primes(xs: Stream[Int] = Stream.from(2)): Stream[Int] =
xs.head #:: primes(xs.tail.filter(_ % xs.head != 0))
primes() takeWhile {
_ <= 100
} foreach {
println
}
}
**[[うるう年測定>練習問題#i0d67516]] [#xd158eb1]
import java.util.GregorianCalendar
object Main extends App {
val cal = new GregorianCalendar()
while (true) {
print("西暦を入力してください> ")
val y = readInt()
if (y <= 0) sys.exit()
printf("%dはうるう年%s\n", y,
if (cal.isLeapYear(y)) "です" else "ではありません")
}
}
**[[転置行列>練習問題#q9f27a17]] [#o9735320]
import scala.annotation.tailrec
object Main extends App {
type Mx = List[Array[String]]
@tailrec
def matrix(xs: Mx = Nil): Mx = {
val sep = """\s+""".r
val s = readLine()
if (s.length <= 0) xs else matrix(xs :+ sep.split(s))
}
matrix().transpose.foreach(x => println(x.mkString(" ")))
}
**[[カレンダー出力>練習問題#i5e3e061]] [#xde7305e]
-build.sbt
name := "vipcal"
version := "1.0"
scalaVersion := "2.10.2"
libraryDependencies ++= Seq(
"org.scala-lang" % "scala-swing" % "2.10.2",
"org.swinglabs.swingx" % "swingx-core" % "1.6.5-1"
)
-Main.scala
import scala.swing._
import org.jdesktop.swingx.{JXDatePicker, JXMonthView}
import java.awt.event.{ActionEvent, ActionListener}
object Main extends SimpleSwingApplication {
override lazy val top = new MainFrame with ActionListener {
self =>
val monthView = new JXMonthView()
val datePicker = new JXDatePicker(monthView.getToday)
datePicker.addActionListener(self)
contents = new BoxPanel(Orientation.Vertical) {
contents += Component.wrap(datePicker)
contents += Component.wrap(monthView)
}
def actionPerformed(e: ActionEvent) {
val d = datePicker.getDate
monthView.setFirstDisplayedDay(d)
monthView.setFlaggedDates(d)
}
}
}
#ref(http://i.imgur.com/uAqI9dn.png,nolink,カレンダー)