Data commit

Task/Bulls-and-cows/Java/bulls-and-cows.java

@@ -0,0 +1,52 @@
+import java.util.InputMismatchException;
+import java.util.Random;
+import java.util.Scanner;
+
+public class BullsAndCows{
+	public static void main(String[] args){
+		Random gen= new Random();
+		int target;
+		while(hasDupes(target= (gen.nextInt(9000) + 1000)));
+		String targetStr = target +"";
+		boolean guessed = false;
+		Scanner input = new Scanner(System.in);
+		int guesses = 0;
+		do{
+			int bulls = 0;
+			int cows = 0;
+			System.out.print("Guess a 4-digit number with no duplicate digits: ");
+			int guess;
+			try{
+				guess = input.nextInt();
+				if(hasDupes(guess) || guess < 1000) continue;
+			}catch(InputMismatchException e){
+				continue;
+			}
+			guesses++;
+			String guessStr = guess + "";
+			for(int i= 0;i < 4;i++){
+				if(guessStr.charAt(i) == targetStr.charAt(i)){
+					bulls++;
+				}else if(targetStr.contains(guessStr.charAt(i)+"")){
+					cows++;
+				}
+			}
+			if(bulls == 4){
+				guessed = true;
+			}else{
+				System.out.println(cows+" Cows and "+bulls+" Bulls.");
+			}
+		}while(!guessed);
+		System.out.println("You won after "+guesses+" guesses!");
+	}
+
+	public static boolean hasDupes(int num){
+		boolean[] digs = new boolean[10];
+		while(num > 0){
+			if(digs[num%10]) return true;
+			digs[num%10] = true;
+			num/= 10;
+		}
+		return false;
+	}
+}