文章浏览阅读1.2k次。While printing "Hello world", if this error 'Hello' undeclared occurred that means Hello is supplied to the compiler as a variable not as a text/string. 在打印“ Hello world”时 ,如果发生未声明的错误“ Hello” ,则意味着He..._printf未......
文章浏览阅读2.8k次。一、交互式编程交互式编程不需要创建脚本文件,可以通过以下命令调用:$ scalaWelcome to Scala 2.13.3 (Java HotSpot(TM) 64-Bit Server VM, Java 1.8.0_231).Type in expressions for evaluation. Or try :help.scala> println("Hello World!"......
文章浏览阅读479次。声明变量package com.chuangobject Hello { def main(args: Array[String]) { //使用val定义的变量值是不可变的,相当于java里用final修饰的变量 val i = 1 //使用var定义的变量是可变得,在Scala中鼓励使用val var s = "hell......