scala--REPL--使用顺序编号进行计算

C:\Users\Administrator>scala
Welcome to Scala 2.11.12 (Java HotSpot(TM) 64-Bit Server VM, Java 1.8.0_421).
Type in expressions for evaluation. Or try :help.

scala> val x : Int = 5
x: Int = 5

scala> x
res0: Int = 5

scala> x * 2
res1: Int = 10

scala> res0 * res1
res2: Int = 50

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