REPLでの対話の例（コメントつき）
Welcome to Scala version 2.11.4 (Java HoTM) 64-Bit Server VM, Java 1.8.0_111).
Type in expressions to have them evaluatType :help for more information.
// *** べき乗
scala> Math.pow(2,2)
res0: Double = 4.0
scala> Math.pow(8,8)
res1: Double = 1.6777216E7
scala> Math.PI
res3: Double = 3.141592653589793
scala> 90 / 180 * Math.PI
res4: Double = 0.0 // 整数の除算をしてしまうので0になった
// 順序を変えることで対処できる
scala> 90 * Math.PI / 180
res5: Double = 1.5707963267948966
scala> 120 * Math.PI / 180
res6: Double = 2.0943951023931953
scala> 180 * Math.PI / 180
res7: Double = 3.141592653589793
// *** ループ
scala> for(x <- 1 to 10) println(x)
1
2
3
4
5
6
7
8
9
10
scala> for(i <- 1 to 10) println(i)
1
2
3
4
5
6
7
8
9
10
scala> for(i <- 1.0 to 3 by 0.2) println(i)
1.0
1.2
1.4
1.5999999999999999
1.7999999999999998
1.9999999999999998
2.1999999999999997
2.4
2.6
2.8000000000000003
3.0000000000000004
// *** タブ文字を含む文字列
scala> println("abcdefg\thijklmn\topqursu")
abcdefg hijklmn opqurstu
scala> println("abcd\thijklmn\topqurstu")
abcd hijklmn opqurstu
scala> println("abcd\thijk\topqurstu")
abcd hijk opqurstu
scala> println("abd\thjk\topqurstu")
abd hjk opqurstu
scala> "1\t2"
res17: String = 1 2
scala> println("1\t2")
1 2
scala> for(n<-1 to 10) println(n+"\t"+f(n))
1 1.0
2 4.0
3 9.0
4 16.0
5 25.0
6 36.0
7 49.0
8 64.0
9 81.0
10 100.0
scala> def f(x:Double)=x*x
f: (x: Double)Double
scala> for(n<-1 to 10) println(n+","+f(n))
1,1.0
2,4.0
3,9.0
4,16.0
5,25.0
6,36.0
7,49.0
8,64.0
9,81.0
10,100.0
scala> for(n<-1 to 10) println(n+", "+f(n))
1, 1.0
2, 4.0
3, 9.0
4, 16.0
5, 25.0
6, 36.0
7, 49.0
8, 64.0
9, 81.0
10, 100.0
scala> for(n<-1 to 10) println(n+" : "+f(n))
1 : 1.0
2 : 4.0
3 : 9.0
4 : 16.0
5 : 25.0
6 : 36.0
7 : 49.0
8 : 64.0
9 : 81.0
10 : 100.0
scala> for(n<-1 to 10) println(n+"\t"+f(n))
1 1.0
2 4.0
3 9.0
4 16.0
5 25.0
6 36.0
7 49.0
8 64.0
9 81.0
10 100.0
// ***
scala> 1
res24: Int = 1
scala> 1.toString
res25: String = 1
scala> s"ab\n${1+2}c"
res2: String =
ab
3c
// *** f変換
scala> f"${1}%2d"
res5: String = " 1"
scala> f"${1.0}%3f"
res6: String = 1.000000
scala> f"${1.0}%3.3f"
res7: String = 1.000
scala> for(x<-1.0 to 2.0 by 0.1) println(f"$x%3.3f\t${x*x}%3.3f")
1.000 1.000
1.100 1.210
1.200 1.440
1.300 1.690
1.400 1.960
1.500 2.250
1.600 2.560
1.700 2.890
1.800 3.240
1.900 3.610
2.000 4.000
scala> for(n<-1 to 10) println(f"${n}%3d\t${f(n)}%-3.3f")
1 1.000
2 4.000
3 9.000
4 16.000
5 25.000
6 36.000
7 49.000
8 64.000
9 81.000
10 100.000
// *** Collection を使った方法（まだ解説していない）
scala> f"${10}%f"
res51: String = 10.000000
scala> f"${10}%5.2f"
res52: String = 10.00
scala> f"${10}%10.2f"
res53: String = " 10.00"
scala> (1.0 to 2 by 0.2).map((e:Double)=>{e*e})
res57: scala.collection.immutable.IndexedSeq[Double] = Vector(1.0, 1.44, 1.9599999999999997, 2.5599999999999996, 3.2399999999999993, 3.999999999999999)
scala> (1.0 to 2 by 0.2).map((e:Double)=>e*e)
res58: scala.collection.immutable.IndexedSeq[Double] = Vector(1.0, 1.44, 1.9599999999999997, 2.5599999999999996, 3.2399999999999993, 3.999999999999999)
scala> (1.0 to 2 by 0.2).map((e:Double)=>Math.pow(e,2))
res60: scala.collection.immutable.IndexedSeq[Double] = Vector(1.0, 1.44, 1.9599999999999997, 2.5599999999999996, 3.2399999999999993, 3.999999999999999)
scala> (1.0 to 2 by 0.2).map(Math.pow(_,2))
res61: scala.collection.immutable.IndexedSeq[Double] = Vector(1.0, 1.44, 1.9599999999999997, 2.5599999999999996, 3.2399999999999993, 3.999999999999999)
scala> (1.0 to 2 by 0.2).map((e)=>Math.pow(e,2))
res62: scala.collection.immutable.IndexedSeq[Double] = Vector(1.0, 1.44, 1.9599999999999997, 2.5599999999999996, 3.2399999999999993, 3.999999999999999)
scala> (1.0 to 2 by 0.2).map((e)=>f"${e}%3.3f\t${Math.pow(e,2)}%8.3f")
res64: scala.collection.immutable.IndexedSeq[String] = Vector(1.000 1.000, 1.200 1.440, 1.400 1.960, 1.600
2.560, 1.800 3.240, 2.000 4.000)
scala> (1.0 to 2 by 0.2).map((e)=>f"${e}%3.3f\t${Math.pow(e,2)}%8.3f").foreach(println)
1.000 1.000
1.200 1.440
1.400 1.960
1.600 2.560
1.800 3.240
2.000 4.000
scala>