Decision tables: Difference between revisions

=={{header|Scala}}==

{{trans|Java}}

<lang scala>import java.io.{BufferedReader, InputStreamReader}

import scala.util.control.Breaks

object DecisionTables {

val conditions = List(

("Printer prints", "NNNNYYYY"),

("A red light is flashing", "YYNNYYNN"),

("Printer is recognized by computer", "NYNYNYNY")

)

val actions = List(

("Check the power cable", "NNYNNNNN"),

("Check the printer-computer cable", "YNYNNNNN"),

("Ensure printer software is installed", "YNYNYNYN"),

("Check/replace ink", "YYNNNYNN"),

("Check for paper jam", "NYNYNNNN")

)

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

// var x = (1, 2)

// println(x)

// println(conditions)

// println(actions)

val nc = conditions.size

val na = actions.size

val nr = conditions.head._2.length

val np = 7

val br = new BufferedReader(new InputStreamReader(System.in))

println("Please answer the following questions with a y or n:")

val answers = Array.ofDim[Boolean](nc)

for (c <- 0 until nc) {

var input = ""

do {

printf(" %s ? ", conditions(c)._1)

input = br.readLine().toUpperCase

} while (input != "Y" && input != "N")

answers(c) = input == "Y"

}

println("\nRecommended actions(s)")

val Outer = new Breaks

val Inner = new Breaks

Outer.breakable {

for (r <- 0 until nr) {

var outer = true

Inner.breakable {

for (c <- 0 until nc) {

val yn = if (answers(c)) 'Y' else 'N'

if (conditions(c)._2(r) != yn) {

outer = false

Inner.break

}

}

}

if (outer) {

if (r == np) {

println(" None (no problem detected)")

} else {

for (action <- actions) {

if (action._2(r) == 'Y') {

printf(" %s\n", action._1)

}

}

}

Outer.break

}

}

}

}

}</lang>

{{out}}

<pre>Please answer the following questions with a y or n:

Printer prints ? y

A red light is flashing ? y

Printer is recognized by computer ? y

Recommended actions(s)

Check/replace ink</pre>