added assignment 9 ex 1

src/Assignment9/Assignment9.scala

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+import Assignment9.Kelvin.kel2cel
+
+import scala.language.implicitConversions
+
+
+package object Assignment9 {
+  sealed trait Temperature {
+  }
+
+  object Temperature {
+    implicit def cel2kel(celsius: Celsius): Kelvin = new Kelvin(celsius.value + 273.15)
+    implicit def kel2cel(kelvin: Kelvin): Celsius = new Celsius(kelvin.value - 273.15)
+  }
+
+  case class Celsius(value: Double) extends Temperature {
+    override def toString: String = s"$value°C"
+  }
+  object Celsius {
+    implicit def val2cel(value: Double): Celsius = new Celsius(value)
+  }
+
+  case class Kelvin(value: Double) extends Temperature {
+    override def toString: String = s"$value K"
+  }
+  object Kelvin {
+    implicit def kel2cel(value: Double): Kelvin = new Kelvin(value)
+
+  }
+}

src/Assignment9/Ex1.scala

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+package Assignment9
+
+import scala.language.implicitConversions
+
+object Ex1 extends App {
+  val a: Celsius = 30
+  val b: Kelvin = 30
+  val c: Kelvin = Celsius(10)
+  val d: Celsius = c
+  val e: Temperature = d
+
+  println(a) // Should print "30°C"
+  println(b) // Should print "30 K"
+
+  println()
+}