Question

**java**

A bicycle combination lock has four rings with numbers 0 through 9. Given the actual numbers and the combination to unlock, print instructions to unlock the lock using the minimum number of twists. A “twist up” increases the number value of a ring, and a “twist down” decreases it. For example, if the actual number shown is 1729 and the desired combination is 5714, write your instructions like this:

Ring 1: Twist up 4 times

Ring 3: Twist down once

Ring 4: Twist up or down 5 times

Answer 1

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OUTPUT:

RAWCODE:

import java.util.*;

public class Lock{

   public static void main(String[] args) {
      
       int[] lockKey = {5,7,1,4};           //Original Key
       int[] userKey = new int[4];           //Array to store user key

       Scanner sc = new Scanner(System.in);

       for (int i=0;i<4;i++) {
           userKey[i] = sc.nextInt();       //Storing User input into userKey
       }

       int correct = 0,up,down;

       for (int i=0;i<4;i++) {
           if (lockKey[i] == userKey[i])       //If user key value and original key value is equal then,increase correct by 1
               correct++;
           else if (lockKey[i]>userKey[i]){   //If Lock key is greater than userkey

               up = Math.abs(lockKey[i] - userKey[i]);           //Up rotaion will be lock key - user key
               down = Math.abs(((10-lockKey[i])+userKey[i])%10);//Down rotation, we use a simple logic as it is a circular queue rotations will be ((10-lockKey[i])+userKey[i])%10)
               if (up == down)
                   System.out.println("Ring "+(i+1)+": Twist up or down "+down+" times");   //If up and down rotaitons are equal then shows below message
               else
                   System.out.println("Ring "+(i+1)+": Twist "+(up>down?"down ":"up ")+Math.min(up,down)+" times");   //Otherwise suggests either down or up rotation.Which is best

           }
           else{       //If Lock key is less than userkey
               down = Math.abs(lockKey[i] - userKey[i]);       //Down rotaion will be lock key - user key
               up = Math.abs(((10-userKey[i])+lockKey[i])%10); ////Up rotation, we use a simple logic as it is a circular queue rotations will be ((10-lockKey[i])+userKey[i])%10)

               if (up == down)
                   System.out.println("Ring "+(i+1)+": Twist up or down "+down+" times");   //If up and down rotaitons are equal then shows below message
               else
                   System.out.println("Ring "+(i+1)+": Twist "+(up>down?"down ":"up ")+Math.min(up,down)+" times"); //Otherwise suggests either down or up rotation.Which is best
           }

       }
       if (correct==4)       //If All user keys matches original key,then lock opens
           System.out.println("Lock Opened");

   }
}

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