流程控制2

object liuceng2 {
  def main(args: Array[String]): Unit = {
    //循环引入变量
    for (i <- 1 to 10){
      val j = 10 - i
      println("i ="+ i + ", j = "+ j )
    }

    println("=======================")

    for (i <- 1 to 10 ; j = 10 - i){
      println("i ="+ i + ", j = "+ j )
    }

    println("=======================")

    for {i <- 1 to 10
      j = 10 - i
    }
    {
      println("i ="+ i + ", j = "+ j )
    }
    println("==========================")

    //打印输出一个九层妖塔
    //1.
    for (i <- 1 to 9){
      val kong = 9 - i
      val xin = 2 * i - 1
      println(" " * kong + "*" * xin )
    }
    //2.
    for (i <- 1 to 9;kong = 9 - i;xin = 2 * i - 1){
      println(" " * kong + "*" * xin )
    }
    //3.
    for (i <- 1 to 9){
      println(" " * (9 - i ) + "*" * (2 * i - 1))
    }
    //循环返回值
      val b= for (i <- 1 to 10) yield i
        println("b =" + b)

    //yield是一个关键字，在当前for循环生成一个集合类型作为返回值返回
    //for循环里面默认返回值都为空（Unit）

    //while
     var o :Int = 10
     while (o >= 1){
      println("this is while loop:" + o )
      o -= 1
    }
  }
}

标签：控制,val,10,流程,xin,kong,while,println
来源： https://www.cnblogs.com/zml603/p/16282357.html