Question

. 9. 10. 1. 11. 12. 13. 1. 14. 15. 16 2.1.3.4.1.5. 16. 17:18 Write a int method rolID20(int int m, Randomr) that returns how many times It takes to roll two numbers with a single 20 sided dice. The parameters to the method are as follows: into The first number you are trying to roll int m The second number you are trying to roll Randomr A Random object to simulate the dice rolls. Please see the documentation for the Random class here. In your solution, you should use the nextInt method to get a random number between 1 and 20. Note that r.nextInt(20) will give you a random number between 0 and 19. You can do r.nextInt(20) + 1 to shift to the desired range of 1 to 20. . Additionally, your method should print the following messages: Whenever a new number is rolled (with r.nextInt), print the message: You rolled a <! Where x is the random number that was rolled. • When the first desired number (int n) is rolled for the first time, print the message: First number rolled! When the second desired number (int m) is rolled for the first time, print the message: Second number rolled! Once both numbers (n and m) have been rolled, print one of the following messages: If n and m are the same number, print a message such as: It took 23 rolls to get two 4's. Where 23 and 4 are replaced with the number of dice rolls performed and the value of n/m. If n and m are different numbers, print a message such as: It took 62 rolls to get a 4 and a 5. Where 62 is replaced with the number of dice rolls performed and 4 and 5 are replaced with n and m, respectively. o O

Answer 1

Abc

Abc_Roll.java

import java.util.Random;

public class Abc_Roll {
   public static int rollD20(int n, int m, Random r)
   {
       //both n and m should be in the range of [1-20].
       if(n>20 || n<=0 || m>20 || m<=0)
       {
           System.out.println("Invalid numbers in parameter");
           return -1;
       }
       //variable to count the number of rolls.
       int count = 0;
       //flag variables to check when the first and second numbers have been rolled.
       int firstnum = 0;
       int secondnum = 0;
      
       //keep looping till the time we have rolled both the given numbers
       while(true)
       {
           //roll the next number between [1-20]
           int generate = r.nextInt(20)+1;
           count++;
           //the first time the first number is rolled.
           if(generate == n && firstnum == 0)
           {
               System.out.println("First number rolled!");
               firstnum = 1;
           }
           //the first time the second number is rolled.
           else if(generate == m && secondnum == 0)
           {
               System.out.println("Second number rolled!");
               secondnum = 1;
           }
           else
               System.out.println("You rolled a <"+generate+">!");
          
           //ending the loop when both the numbers are rolled.
           if(firstnum == 1 && secondnum == 1)
               break;
       }
       //print the given statements as given in the question.
       if(n == m)
           System.out.println("It took "+count+" rolls to get two "+n+"'s.");
       else
           System.out.println("It took "+count+" rolls to get a "+n+" and a "+m+".");
      
       return count;
   }
   public static void main(String[] args) {
       Random r = new Random();
       rollD20(5,7,r);
   }

}

OUTPUT: