学习笔记——spark基础实验二

  今天学习了scala语言的基础知识，并完成了spark基础实验二的部分内容。

  题目1：

import io.StdIn._

object jishu{
    def main(args:Array[String]){
    var Sn:Float = 0
    var n:Float = 1
    print("请输入q：")
    val q = readInt();
    while(Sn<q){
        Sn += (n+1)/n
        n += 1
    }
    println("Sn="+Sn)
    }
}   

 

题目2：

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。
    abstract class Shape(var location:Point){//location是Shape的一个可变字段
    def moveTo(newLocation:Point){ //默认实现，只是修改位置
        location = newLocation
        }
     def zoom(scale:Double)
    }
    class Line(beginPoint:Point,var endPoint:Point) extends Shape(beginPoint) with Drawable{
    override def draw(){
        println("line:("+location.x+","+location.y+")--"+"("+endPoint.x+","+endPoint.y+")")
    }
    override def moveTo(newLocation:Point){
            endPoint.shift(newLocation.x - location.x,newLocation.y - location.y) //直线移动时，先移动另外一个端点
        location = newLocation //移动位置
        }
        override def zoom(scale:Double){
        val midPoint = Point((endPoint.x + location.x)/2,(endPoint.y + location.y)/2) //求出中点，并按中点进行缩放
        location.x = midPoint.x + scale * (location.x - midPoint.x)
        location.y = midPoint.y + scale * (location.y -midPoint.y)
        endPoint.x = midPoint.x + scale * (endPoint.x - midPoint.x)
        endPoint.y = midPoint.y + scale * (endPoint.y -midPoint.y)
        }
    }
    class Circle(center:Point,var radius:Double) extends Shape(center) with Drawable{
    override def draw(){//按指定格式重载click
        println(s"Circle center:(${location.x},${location.y}),R=$radius")
    }
        override def zoom(scale:Double){
    radius = radius*scale //对圆的缩放只用修改半径
        }
    }
    

    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
        }
    }