Question

Write a Game for a picking stones being played between a user and computer. Rules for the game are: • There are total 21 stones. • User will start picking the stones. • User cannot pick more than 3 or remaining stones (whichever is less). • After the user picks the stones, computer does its picking. • Computer cannot pick more than 3 or remaining stones (whichever is less). • Repeat the picking (User and Computer) if stones are available. • Whoever is forced to pick up the last stone loses the game. • Your program should ensure that the computer always wins.

Answer 1

PickingStoneGame.java

import java.util.Random;
import java.util.Scanner;

public class PickingStoneGame {
   public static void main(String[] args) {
       // Random class object to generate random integer
       Random random=new Random();
       // Scanner class object to get the input from user
       Scanner input=new Scanner(System.in);
       System.out.println("*** Welcome to Picking Stone Game ***");
       // declare local variables
       int userPick;
       int computerPick;
       int stones=21;
       while(true) {
           // print remaining stones
           System.out.println("No of stones remaining: "+stones);
           System.out.print("User picks: ");
           userPick=input.nextInt(); // get the user pick
           // check for user picked valid number of picks or not
           if(userPick>3) {
               System.out.println("Invalid pick, kindly pick between 1 to 3 stones.");
               continue;
           }
           if(userPick>stones) {
               System.out.println("Invalid pick, kindly pick less than or equal to remaing stones.");
               continue;
           }
           // subtract stones user picked from total stones
           stones-=userPick;
           // check user picked last stone or not
           if(stones==0) {
               System.out.println("*** You Lost the Game ***");
               break;
           }
           while(true) {
               // randomly generate the computer's pick
               computerPick=random.nextInt(2)+1;
               if(computerPick>stones)
                   continue;
               System.out.println("Computer picks: "+computerPick);
               break;
           }
           // subtract stones computer picked from total stones
           stones-=computerPick;
           // check computer picked last stone or not
           if(stones==0) {
               System.out.println("*** Congratulations.. You Won the Game ***");
               break;
           }
       }
       input.close(); // close Scanner object
   }
}

Sample run