Scala编程实验一

import scala.io.StdIn
object helloworld {
  def sum(x:Int,y:Int):Int= {
    var num = 0;
    for (i <- x to y) {
      num += i;
    }
    num
  }
  def main(args: Array[String]) {
  val x,y=readInt();
//    val y=readInt();
  print(sum(x,y))
}
}

object gcd {
  def gcde(x:Int,y:Int): Int ={
    var i =0;
    if(x<y){
      i=x;
    }
    else{
      i=y
    }
    var flag = true
    while(flag){
      if(x%i==0&&y%i==0){
        flag=false     }
       i=i-1;
    }
    i=i+1;
    i
  }
  def main(args: Array[String]){
  val x,y=readInt();
  print(gcde(x,y));
}
}

object yhsj {
  def main(args: Array[String]) {
    //杨辉三角
    val a =Array.ofDim[Int](10,10)
    for(i<- 0 until a.length){
      a(i)(0)=1
      a(i)(i)=1
    }
    for(i <-2 until a.length ){
      for(j <-1 until a(i).length){
        a(i)(j)=a(i-1)(j-1)+a(i-1)(j)
      }
    }
    for(i <-0 until a.length){
      for(j <- 0 until a(i).length  if j<=i){
        print(a(i)(j)+"\t")
      }
      println()
    }
  }
}