寒假第六天

实验二的2

 模拟图形绘制 

object test {
  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 extends  Drawable {
  def moveTo(point: Point)
 
  def zoom(position: Double)
 
  def draw()
}
 
case class Point(var x:Double,var y:Double) extends Drawable{
  var Px :Double=x
  var Py :Double=y
 
  def shift(deltaX:Double,deltaY:Double){
    Px+=deltaX;Py+=deltaY
  }
 
  override def draw():Unit = {
    println("Point:("+Px+","+Py+")")
  }
}
 
trait Drawable{
  def draw(){println(this.toString)}
}
 
class Line(point1: Point, point2: Point)extends  shape {
  override def moveTo(point: Point):Unit = {
    point1.shift(point.Px,point.Py)
    point2.shift(point.Px,point.Py)
  }
 
  override def zoom(position:Double): Unit ={
    var lengthx = point2.Px-point1.Px
    var lengthy = point2.Py-point1.Py
    if(lengthx<0){
      lengthx = -lengthx;
    }
    if(lengthy<0){
      lengthy = -lengthy;
    }
    var newx = (lengthx/2)*(position-1);
    point1.Px = point1.Px-newx;
    point2.Px = point2.Px+newx;
 
    var newy =(lengthy/2)*(position-1);
    point1.Py = point1.Py-newy;
    point2.Py = point2.Py+newy;
  }
 
  override def draw(): Unit = {
    println("Line:(" + point1.Px + "," + point1.Py + ")--(" + point2.Px + "," + point2.Py + ")")
  }
}
 
class Circle(point: Point, r: Double) extends shape {
  var R = r
 
  override def moveTo(point: Point): Unit = {
    this.point.Px = point.Px
    this.point.Py = point.Py
  }
 
  override def zoom(step: Double): Unit = {
    R = R * step
  }
 
  override def draw(): Unit = {
    println("Circle center:(" + point.Px + "," + point.Py + "),R=" + R);
  }
}

3 统计学生成绩 

import scala.collection.mutable.ArrayBuffer
 
object test2 {
  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	 average	 min	 max 	")
    println("Math:	   "+Mathaverage+"		"+MathMin+"	 "+MathMax)
    println("English:	"+Englishaverage+"	"+EnglishMin+"	 "+EnglishMax)
    println("Physics:	"+Physicsaverage+"	"+PhysicsMin+"	 "+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	 average	 min	 max 	(Male)")
    Mathaverage=Mathaverage.toInt
    Englishaverage=Englishaverage.toInt
    Physicsaverage=Physicsaverage.toInt
    println("Math:	   "+Mathaverage+"		"+MathMin+"	 "+MathMax)
    println("English:	   "+Englishaverage+"		"+EnglishMin+"	 "+EnglishMax)
    println("Physics:	   "+Physicsaverage+"		"+PhysicsMin+"	 "+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	 average	 min	 max 	(FeMale)")
    Mathaverage=Mathaverage.toInt
    Englishaverage=Englishaverage.toInt
    Physicsaverage=Physicsaverage.toInt
    println("Math:	   "+Mathaverage+"		"+MathMin+"	 "+MathMax)
    println("English:	   "+Englishaverage+"		"+EnglishMin+"	 "+EnglishMax)
    println("Physics:	   "+Physicsaverage+"		"+PhysicsMin+"	 "+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)"
}

 

 今天学到了如何使用scala来编译运行程序

  1. cd /usr/local/scala/mycode
  2. vim test.scala
  3. 写入你要的程序
  4. scalac test.scala //编译的时候使用的是Scala文件名称
  5. scala  HelloWorld //执行的时候使用的是HelloWorld对象名称
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原文地址：https://www.cnblogs.com/zlj843767688/p/12245080.html