scala--定义变量--重新赋值--类型int自动转换成类型double

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 y = 1.5
y: Double = 1.5

scala> y = 42
y: Double = 42.0

scala>