流程控制

import scala.language.postfixOps
import scala.math.BigDecimal.double2bigDecimal

object xun {
  def main(args: Array[String]): Unit = {
    //1.循环守卫
    for (i  <- 1 to 10){
      if(i != 5){
        println(i)
      }
    }

    for (i <- 1 to 10 if i != 5){
      println(i)
    }

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

    //2.循环步长
    for (i <- 1 to 10 by 2){
      println(i)
    }
    println("----------")
    for (i <- 13 to 30 by 4){
      println(i)
    }
    println("----------")
    for (i <- 30 to 13 by -3){
      println(i)
    }
    println("----------")
    for (i <- 1 to 10 reverse){
      println(i)
    }
    println("----------")
    for (i <- 1.0 to 10.0 by 0.33 ){
      println(i)
    }
    println("----------")
    //3.循环嵌套
    for (i <- 1 to 3 ;j <- 2 to 5){
      println(" i = " + i + " j = " + j)
    }
    println("----------")
    //打印九九乘法表
    for (i <- 1 to 9 ){
      for (j <- 1 to i ){
        print(s"$j * $i = ${i * j} \t")
      }
      println()
    }
  }
}