Your tasks Implement the functions marked with ??? in withProb.scala. （as shown in below） package withProb: /** * NOTE: The seed should be System.nanoTime or something similar * in order to get real pseudo-randomness but we fix it now * for the sake of repeatability. */ val rand = new scala.util.Random(2105) /** * Executes the given code with probability "prob". * For instance, * doWithProb(30.0) { Console.println("I'm feeling lucky!") } * shall print the text to the console with probability of 30 percent. * * Note that you have to modify the type of the "thenAction" parameter so that it admits code * to be passed in "call-by-name" evaluation mode. * Please see the course material and * http://docs.scala-lang.org/tour/automatic-closures.html */ def doWithProb(prob: Double)(thenAction: Unit): Unit = require(0.0 <= prob && prob <= 100.0) ??? end doWithProb /** * The expression * withProb(prob) {choice1} otherwise {choice2} * returns the value of the first choice code with probability prob and * the value of the second choice with probability 1-prob. * * For instance, * val x = 2 * val y = 3 * val z: Int = withProb(30.0) {x*y} otherwise {0} * shall return 6 with 30% probability and 0 with 70% probability. * * Observe that we can also write a statement like * withProb(70.0) { println("first action") } otherwise { println("second action") } * The return value is just ignored. * * Note that you have to modify the types of the choice1 and choice2 parameters so that they admit code * with correct return type to be passed in "call-by-name" evaluation mode. * Again, please see the course material and especially * http://docs.scala-lang.org/tour/automatic-closures.html * for help. */ def withProb[T](prob: Double)(choice1: Any): withProbElse[T] = require(0.0 <= prob && prob <= 100.0) ??? end withProb protected class withProbElse[T](prob: Double, choice1: Any): def otherwise(choice2: Any): T = ??? end otherwise

Your tasks Implement the functions marked with ??? in withProb.scala. （as shown in below） package withProb: /** * NOTE: The seed should be System.nanoTime or something similar * in order to get real pseudo-randomness but we fix it now * for the sake of repeatability. */ val rand = new scala.util.Random(2105) /** * Executes the given code with probability "prob". * For instance, * doWithProb(30.0) { Console.println("I'm feeling lucky!") } * shall print the text to the console with probability of 30 percent. * * Note that you have to modify the type of the "thenAction" parameter so that it admits code * to be passed in "call-by-name" evaluation mode. * Please see the course material and * http://docs.scala-lang.org/tour/automatic-closures.html */ def doWithProb(prob: Double)(thenAction: Unit): Unit = require(0.0 <= prob && prob <= 100.0) ??? end doWithProb /** * The expression * withProb(prob) {choice1} otherwise {choice2} * returns the value of the first choice code with probability prob and * the value of the second choice with probability 1-prob. * * For instance, * val x = 2 * val y = 3 * val z: Int = withProb(30.0) {xy} otherwise {0} shall return 6 with 30% probability and 0 with 70% probability. * * Observe that we can also write a statement like * withProb(70.0) { println("first action") } otherwise { println("second action") } * The return value is just ignored. * * Note that you have to modify the types of the choice1 and choice2 parameters so that they admit code * with correct return type to be passed in "call-by-name" evaluation mode. * Again, please see the course material and especially * http://docs.scala-lang.org/tour/automatic-closures.html * for help. */ def withProb[T](prob: Double)(choice1: Any): withProbElse[T] = require(0.0 <= prob && prob <= 100.0) ??? end withProb protected class withProbElse[T](prob: Double, choice1: Any): def otherwise(choice2: Any): T = ??? end otherwise

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

See similar textbooks

Your tasks

Implement the functions marked with ??? in withProb.scala. （as shown in below）

package withProb:

/**

* NOTE: The seed should be System.nanoTime or something similar

* in order to get real pseudo-randomness but we fix it now

* for the sake of repeatability.

val rand = new scala.util.Random(2105)

/**

* Executes the given code with probability "prob".

* For instance,

* doWithProb(30.0) { Console.println("I'm feeling lucky!") }

* shall print the text to the console with probability of 30 percent.

* Note that you have to modify the type of the "thenAction" parameter so that it admits code

* to be passed in "call-by-name" evaluation mode.

* Please see the course material and

* http://docs.scala-lang.org/tour/automatic-closures.html

def doWithProb(prob: Double)(thenAction: Unit): Unit =

require(0.0 <= prob && prob <= 100.0)

???

end doWithProb

/**

* The expression

* withProb(prob) {choice1} otherwise {choice2}

* returns the value of the first choice code with probability prob and

* the value of the second choice with probability 1-prob.

* For instance,

* val x = 2

* val y = 3

* val z: Int = withProb(30.0) {x*y} otherwise {0}

* shall return 6 with 30% probability and 0 with 70% probability.

* Observe that we can also write a statement like

* withProb(70.0) { println("first action") } otherwise { println("second action") }

* The return value is just ignored.

* Note that you have to modify the types of the choice1 and choice2 parameters so that they admit code

* with correct return type to be passed in "call-by-name" evaluation mode.

* Again, please see the course material and especially

* http://docs.scala-lang.org/tour/automatic-closures.html

* for help.

def withProb[T](prob: Double)(choice1: Any): withProbElse[T] =

require(0.0 <= prob && prob <= 100.0)

???

end withProb

protected class withProbElse[T](prob: Double, choice1: Any):

def otherwise(choice2: Any): T =

???

end otherwise

end withProbElse

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