new files

Task/Bulls-and-cows/Scala/bulls-and-cows.scala

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+import scala.util.Random
+
+object BullCow {
+   def main(args: Array[String]): Unit = {
+      val number=chooseNumber
+      var guessed=false
+      var guesses=0
+
+      while(!guessed){
+         Console.print("Guess a 4-digit number with no duplicate digits: ")
+         val input=Console.readInt
+         val digits=input.toString.map(_.asDigit).toList
+         if(input>=1111 && input<=9999 && !hasDups(digits)){
+            guesses+=1
+            var bulls, cows=0
+            for(i <- 0 to 3)
+               if(number(i)==digits(i))
+                  bulls+=1
+               else if(number.contains(digits(i)))
+                  cows+=1
+
+            if(bulls==4)
+               guessed=true
+            else
+               println("%d Cows and %d Bulls.".format(cows, bulls))
+         }
+      }
+      println("You won after "+guesses+" guesses!");
+   }
+
+   def chooseNumber={
+      var digits=List[Int]()
+      while(digits.size<4){
+         val d=Random.nextInt(9)+1
+         if (!digits.contains(d))
+            digits=digits:+d
+      }
+      digits
+   }
+
+   def hasDups(input:List[Int])=input.size!=input.distinct.size
+}