Scala-基础-流程控制语句

import junit.framework.TestCase
import scala.util.control.Breaks._
//流程控制语句
//关键字 if else match 
class Demo4 extends TestCase {

  //规则1 if else 有返回值,取最后的值
  //规则2 默认返回的值,当值没有设置时,用()代替
  //规则3 java中的switch没有出现,被scala中的 match代替了,该match允许在匹配值期间,做相关配合运算

  // if else 
  def test_+ {
    val k1 = 105
    val k2 = 101
    println(if (k2 > k1) k2);
    println(if (k2 > k1) 100);
    println(if (k2 > k1) 100 else 101);

    val m1 = if (k1 == 105) {
      if (k2 == 101) 103 else 104
    } else if (k2 == 101) {
      200;
    } else {
      300;
    }

  }

  //switch
  def test_() {
    val k1 = 11;
    var result = 0;
    val m1 = k1 match {
      case 100 => result = 1056; "ABC";
      case 101 => result = 1001; "CBA";
      case _   => result = 1002; "CAB";
    }
    println(result);
    println(m1);
  }

  //for 循环
  def test_*() {
    //for(i < 1 to n ) println()   
    // for(i <- 1 to 10)  print(i+",")
    var rs = 0
    for (i <- 1 to 10) {
      rs += i
    }
    rs = 0;
    //for循环 倒序
    for(i <- (1 to 5).reverse){print(i+" ")}
    
    for (i <- 1 to 3; j <- 1 to 3) {
      rs += (i * j)
    }

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

    for (i <- 1 to 10 if i != 5; j <- 1 to 10 if j != 8) {
      //println(i*j);
    }

    for (i <- 1 to 10; from = i * 2; j <- 1 to from) {
      //println(j);
    }
    
    

  }
  //while 循环
  def test_/() {
    var rs = 0;
    var i = 0;
    while (i < 10) {
      i += 1;
      // println(i);
      rs += i;
    }
    //println(rs);
    rs = 0;
    i = 10;
    while (i > 0) {
      rs += i;
      i -= 1;
    }
    println(rs);
  }

  //break;countinue;
  def test_^() {
    var flag = true;
    for (i <- 1 to 10 if flag) {
        if (i == 5) {
            flag = false;
        }
      if(flag){
        //println(i);
      } 
      flag = true;
    }
    
    
    breakable{
      for(i <- 1 to 5){
        if(i==4){
          break;
        }
        println(i);
      }
    }
    
  }
}