第17章：Scalaの演算子 ref: http://qiita.com/f81@github/items/1e72244cdac7ea512bbb

file0.scala

scala> 1 + 2
res0: Int = 3

scala> 3 - 1
res1: Int = 2

scala> 4 * 2
res2: Int = 8

scala> 6 / 3
res3: Int = 2

scala> 7 % 2
res4: Int = 1

file1.scala

scala> 2 > 1
res0: Boolean = true

scala> 2 >= 2
res1: Boolean = true

scala> 3 < 1
res2: Boolean = false

scala> 3 <= 2
res3: Boolean = false

scala> 1 == 1
res4: Boolean = true

scala> 1 != 1
res5: Boolean = false

file2.scala

scala> ( 2 == 2 ) && ( 1 == 1 )
res0: Boolean = true

scala> ( 2 == 2 ) && ( 1 > 1 )
res1: Boolean = false

scala> ( 2 == 2 ) || ( 1 > 1 )
res2: Boolean = true

scala> ( 2 < 2 ) || ( 1 > 1 )
res3: Boolean = false

scala> !( 2 == 2 )
res4: Boolean = false

scala> !( 2 > 2 )
res5: Boolean = true

file3.scala

scala> 5 & 6
res1: Int = 4

scala> 5 | 6
res2: Int = 7

scala> 5 ^ 6
res3: Int = 3

scala> ~3
res4: Int = -4

scala> 5 << 1
res5: Int = 10

scala> 5 >> 2
res6: Int = 1

scala> -1 >>> 31
res7: Int = 1

file4.scala

scala> var a = 3
a: Int = 3

scala> a *= 4 + 1

scala> a
res2: Int = 15

file5.scala

scala> var a = 3
a: Int = 3

scala> a *= (4 + 1)

scala> a
res4: Int = 15