scala--REPL--使用变量

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> var a : Double = 2.72
a: Double = 2.72

scala> a = 355.0 / 113.0
a: Double = 3.1415929203539825

scala> a = 5
a: Double = 5.0