实验 2 Scala 编程初级实践

参考博客——

https://www.cnblogs.com/kt-xb/p/12297023.html

 

Linux——

 进入Scala所在目录，创建文件夹mycode

 赋予文件夹权限

 chmod -R 777 文件夹所在目录

 创建test.scala ，输入代码，执行文件

代码内容——

import scala.io.StdIn
object test
{
    def main(args: Array[String])
    {
        var Sum=0.0
        println("请输入n")
        var n:Long=StdIn.readLine().toLong
        var i=1.0
        while(Sum<n)
        {
            var mid=(i+i)/i
            Sum=Sum+(i+1)/i
            i=i+1
        }
        println("**************************")
        println("计算级数为：",Sum)
    }
}

 

第一题结束

后边路流程与最后两步相同

 所需代码

case class Point(var x:Double ,var y:Double) extends Drawable{
    def shift(X:Double ,Y:Double){
        x += X
        y += Y
    }
}
trait Drawable{
    def draw(){println(this.toString)}
}
abstract class Shape(var location:Point)//location是shape的一个可变字段
{
    def moveTo(newLocation:Point)
    {
        location = newLocation
    }
    def zoom(scale:Double)
}
class Line(beginPoint:Point,var endPoint:Point)extends Shape(beginPoint) with Drawable{
    override def draw()
    {
        println(s"Line:(${location.x},${location.y}--(${endPoint.x},${endPoint.y})")
    }
    override def moveTo(newLocation:Point)
    {
        endPoint.shift(newLocation.x-location.x,newLocation.y-location.y)
        location = newLocation
    }
     override def zoom(scale:Double)
     {
        val midPoint=Point((endPoint.x+location.x)/2,(endPoint.y+location.y)/2)
        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()
    {
        println(s"Circle center:(${location.x},${location.y}),R=$radius")
    }
    override def zoom(scale :Double)
    {
        radius = radius*scale
    }
}
object test2
{
    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))
        line1.draw
        line1.zoom(2)
        line1.draw
        val circle = new Circle(Point(10,10),5)
        circle.draw
        circle.moveTo(Point(30,20))
        circle.draw
        circle.zoom(0.5)
        circle.draw
    }
}

 import scala.collection.mutable.ArrayBuffer

   

object test3 {

  def main(args: Array[String]): Unit = {

    var students:ArrayBuffer[Student] = new ArrayBuffer[Student]()

    students.append(new Student(301610, "male", 80, 64, 78))

    students.append(new Student(301611, "female", 65, 87, 58))

    students.append(new Student(301612, "female", 44, 71, 77))

    students.append(new Student(301613, "female", 66, 71, 91))

    students.append(new Student(301614, "female", 70, 71, 100))

    students.append(new Student(301615, "male", 72, 77, 72))

    students.append(new Student(301616, "female", 73, 81, 75))

    students.append(new Student(301617, "female", 69, 77, 75))

    students.append(new Student(301618, "male", 73, 61, 65))

    students.append(new Student(301619, "male", 74, 69, 68))

    students.append(new Student(301620, "male", 76, 62, 76))

    students.append(new Student(301621, "male", 73, 69, 91))

    students.append(new Student(301622, "male", 55, 69, 61))

    students.append(new Student(301623, "male", 50, 58, 75))

    students.append(new Student(301624, "female", 63, 83, 93))

    students.append(new Student(301625, "male", 72, 54, 100))

    students.append(new Student(301626, "male", 76, 66, 73))

    students.append(new Student(301627, "male", 82, 87, 79))

    students.append(new Student(301628, "female", 62, 80, 54))

    students.append(new Student(301629, "male", 89, 77, 72))

    println(students.length)

    println(students(1).toString)

   

    getData(students)

    getDataMale(students)

    getDataFeMale(students)

  }

  def getData(value: ArrayBuffer[Student]): Unit ={

    var Mathaverage:Double=0;

    var MathSum:Double = 0;

    var MathMin:Double = value(0).Math;

    var MathMax:Double = 0;

   

    var Englishaverage:Double=0;

    var EnglishSum:Double = 0;

    var EnglishMin:Double = value(0).English;

    var EnglishMax:Double = 0;

   

    var Physicsaverage:Double=0;

    var PhysicsSum:Double = 0;

    var PhysicsMin:Double = value(0).Physics;

    var PhysicsMax:Double = 0;

   

    var number = value.length;

    for (i <- 0 until value.length){

      //三科总数

      MathSum = value(i).Math+MathSum

      EnglishSum = value(i).English+EnglishSum

      PhysicsSum = value(i).Physics+PhysicsSum

      //最大和最小

      if(value(i).Math>MathMax){

        MathMax=value(i).Math;

      }

      if(value(i).English>EnglishMax){

        EnglishMax=value(i).English;

      }

      if(value(i).Physics>PhysicsMax){

        PhysicsMax=value(i).Physics;

      }

      if(value(i).Math<MathMin){

        MathMin=value(i).Math;

      }

      if(value(i).English<EnglishMin){

        EnglishMin=value(i).English;

      }

      if(value(i).Physics<PhysicsMin){

        PhysicsMin=value(i).Physics;

      }

    }

    //平均值

    Mathaverage=MathSum/number

    Englishaverage=EnglishSum/number

    Physicsaverage=PhysicsSum/number

    println("course\t average\t min\t max \t")

    println("Math:\t   "+Mathaverage+"\t\t"+MathMin+"\t "+MathMax)

    println("English:\t"+Englishaverage+"\t"+EnglishMin+"\t "+EnglishMax)

    println("Physics:\t"+Physicsaverage+"\t"+PhysicsMin+"\t "+PhysicsMax)

  }

   

  def getDataMale(value: ArrayBuffer[Student]): Unit = {

    var Mathaverage: Double = 0;

    var MathSum: Double = 0;

    var MathMin: Double = value(0).Math;

    var MathMax: Double = 0;

   

    var Englishaverage: Double = 0;

    var EnglishSum: Double = 0;

    var EnglishMin: Double = value(0).English;

    var EnglishMax: Double = 0;

   

    var Physicsaverage: Double = 0;

    var PhysicsSum: Double = 0;

    var PhysicsMin: Double = value(0).Physics;

    var PhysicsMax: Double = 0;

   

    var number = 0;

   

    for (i <- 0 until value.length) {

      if (value(i).gender.equals("male")) {

        number = number + 1

        //三科总数

        MathSum = value(i).Math + MathSum

        EnglishSum = value(i).English + EnglishSum

        PhysicsSum = value(i).Physics + PhysicsSum

        //最大和最小

        if (value(i).Math > MathMax) {

          MathMax = value(i).Math;

        }

        if (value(i).English > EnglishMax) {

          EnglishMax = value(i).English;

        }

        if (value(i).Physics > PhysicsMax) {

          PhysicsMax = value(i).Physics;

        }

        if (value(i).Math < MathMin) {

          MathMin = value(i).Math;

        }

        if (value(i).English < EnglishMin) {

          EnglishMin = value(i).English;

        }

        if (value(i).Physics < PhysicsMin) {

          PhysicsMin = value(i).Physics;

        }

      }

   

    }

    //平均值

    Mathaverage=MathSum/number

    Englishaverage=EnglishSum/number

    Physicsaverage=PhysicsSum/number

    println("course\t average\t min\t max \t(Male)")

    Mathaverage=Mathaverage.toInt

    Englishaverage=Englishaverage.toInt

    Physicsaverage=Physicsaverage.toInt

    println("Math:\t   "+Mathaverage+"\t\t"+MathMin+"\t "+MathMax)

    println("English:\t   "+Englishaverage+"\t\t"+EnglishMin+"\t "+EnglishMax)

    println("Physics:\t   "+Physicsaverage+"\t\t"+PhysicsMin+"\t "+PhysicsMax)

  }

   

  def getDataFeMale(value: ArrayBuffer[Student]): Unit ={

    var Mathaverage:Double=0;

    var MathSum:Double = 0;

    var MathMin:Double = value(1).Math;

    var MathMax:Double = 0;

   

    var Englishaverage:Double=0;

    var EnglishSum:Double = 0;

    var EnglishMin:Double = value(1).English;

    var EnglishMax:Double = 0;

   

    var Physicsaverage:Double=0;

    var PhysicsSum:Double = 0;

    var PhysicsMin:Double = value(1).Physics;

    var PhysicsMax:Double = 0;

   

    var number = 0;

   

    for (i <- 0 until value.length){

      if(value(i).gender.equals("female")){

        number=number+1

        //三科总数

        MathSum = value(i).Math+MathSum

        EnglishSum = value(i).English+EnglishSum

        PhysicsSum = value(i).Physics+PhysicsSum

        //最大和最小

        if(value(i).Math>MathMax){

          MathMax=value(i).Math;

        }

        if(value(i).English>EnglishMax){

          EnglishMax=value(i).English;

        }

        if(value(i).Physics>PhysicsMax){

          PhysicsMax=value(i).Physics;

        }

        if(value(i).Math<MathMin){

          MathMin=value(i).Math;

        }

        if(value(i).English<EnglishMin){

          EnglishMin=value(i).English;

        }

        if(value(i).Physics<PhysicsMin){

          PhysicsMin=value(i).Physics;

        }

      }

    }

    //平均值

    Mathaverage=MathSum/number

    Englishaverage=EnglishSum/number

    Physicsaverage=PhysicsSum/number

    println("course\t average\t min\t max \t(FeMale)")

    Mathaverage=Mathaverage.toInt

    Englishaverage=Englishaverage.toInt

    Physicsaverage=Physicsaverage.toInt

    println("Math:\t   "+Mathaverage+"\t\t"+MathMin+"\t "+MathMax)

    println("English:\t   "+Englishaverage+"\t\t"+EnglishMin+"\t "+EnglishMax)

    println("Physics:\t   "+Physicsaverage+"\t\t"+PhysicsMin+"\t "+PhysicsMax)

  }

}

class Student(id1:Int,gender1:String,Math1:Double,English1:Double,Physics1:Double){

  var id:Int = id1

  var gender:String = gender1

  var Math:Double = Math1

  var English:Double = English1

  var Physics:Double = Physics1

   

  override def toString = s"Student($id, $gender, $Math, $English, $Physics)"

}