spark实验(二)--scala实验(3)

package sn
import scala.io.StdIn

object test {
  def main(args: Array[String]): Unit = {
      println("请输入Sn的n值用以计算Sn=2/1+3/2+4/3+...+(n+1)/n来计算Sn的值");
      var q:Int=StdIn.readInt();
      var i:Int=0;
      var sum:Float=0.0f;
      for(i <- 1 to q)
      {
        var id:Float =i;
        sum+=(id+1)/id;
      }
      println("当n="+q+"时,Sn的值为"+sum);
  }
}

case class Point(var x:Double,var y:Double) extends Drawable{    
    def shift(deltaX:Double,deltaY:Double){
        x+=deltaX;
        y+=deltaY
    } 
} 
trait Drawable{   
    def draw()
    {
        println(this.toString)
    } 
} 

// 请完成 Shape 类、Line 类和 Circle 类的定义。 

object MyDraw{   
    def main(args: Array[String]) {     
        val p=new Point(10,30)    
                p.draw;   
        val line1 = new Line(Point(0,0),Point(20,20))   
                line1.draw   
                line1.moveTo(Point(5,5)) 
                //移动到一个新的点   
                line1.draw   
                line1.zoom(2) 
                //放大两倍   
                line1.draw   
                val cir= new Circle(Point(10,10),5)   
                cir.draw   
                cir.moveTo(Point(30,20))   
                cir.draw   
                cir.zoom(0.5)   
                cir.draw     
    } 
} 

abstract class Shape(var startPoint:Point) extends Drawable
{
  def moveTo(newPoint:Point)
  {
    startPoint =newPoint;
  }
  def zoom(num:Double);
}
class Line(x1:Point,var x2:Point) extends Shape(x1) 
{
  override def zoom(num:Double)
  {
    val midPoint=Point((x2.x+startPoint.x)/2,(x2.y+startPoint.y)/2)
    startPoint.x=midPoint.x+num*(startPoint.x-midPoint.x)
    startPoint.y=midPoint.y+num*(startPoint.y-midPoint.y)
    x2.x=midPoint.x+num*(x2.x-midPoint.x)
    x2.y=midPoint.y+num*(x2.y-midPoint.y)
  }
  override def moveTo(newPoint:Point)
  {
    var x=(newPoint.x-startPoint.x);
    var y=(newPoint.y-startPoint.y);
    startPoint=newPoint;
    x2.shift(x, y)
  }
  override def draw()
  {
    println(s"Line:(${startPoint.x},${startPoint.y})--(${x2.x},${x2.y})") 
  }
    
}

class Circle(center:Point,var radius:Double) extends Shape(center)
{
  override def draw()
  {
    println(s"Circle center:(${startPoint.x},${startPoint.y}),R=$radius") 
  }
  override def zoom(num:Double)
  {
    radius*=num;
  }
}