Question

My code:

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

public class RollDice {
public static void main(String[] args) {
int N;
Scanner keybd = new Scanner(System.in);
int[] counts = new int[12];
  
System.out.print("Enter the number of trials: ");
N = keybd.nextInt();
  
Random die1 = new Random();
Random die2 = new Random();
int value1, value2, sum;
for(int i = 1; i <= N; i++) {
value1 = die1.nextInt(6) + 1;
value2 = die2.nextInt(6) + 1;
sum = value1 + value2;
counts[sum-1]++;
}
  
System.out.printf("%10s %10s %10s\n", "Outcome", "Number", "Percent");
for(int i = 2; i <= 12; i++) {
double perc = counts[i-1] * 100.0 / N;
System.out.printf("%10d %10d %10.1f%%\n", i, counts[i-1], perc);
}
  
}
}

Prompts:

- After running, have your code ask the user if they wish to run the simulation again. If they answer "yes", start over at the beginning. If they answer "no", terminate the program.

- In addition to asking for the number of trials, prompt the user to enter the number of dice to be rolled for the trials (so each trial could roll 3 dice, with sums of 3 to 18, or 10 dice, with sums of 10 to 60).

- In addition to asking for the number of trials, prompt the user to enter the number of sides that the dice have.

Answer 1

If you have any problem with the code feel free to comment.

Program

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

public class Test {
   public static void main(String[] args) {
       int N;
       Scanner keybd = new Scanner(System.in);
      
       String choice;//for taking user choice
       while (true) {//infinite loop
          
           //taking all inputs
           System.out.print("Enter the number of trials: ");
           N = keybd.nextInt();
           keybd.nextLine();
           System.out.print("Enter the number of Dice: ");
           int numDice = keybd.nextInt();
           keybd.nextLine();
           System.out.print("Enter the number of sides: ");
           int sides = keybd.nextInt();
           keybd.nextLine();
          
           int len = sides * numDice;//calculating length
           int[] counts = new int[len];

           Random die1 = new Random();
           int value1, sum;
           for (int i = 1; i <= N; i++) {
               value1 = die1.nextInt(sides) + 1;
               sum = value1 * numDice;//finding value of dice
               counts[sum - 1]++;
           }

           System.out.printf("%10s %10s %10s\n", "Outcome", "Number", "Percent");
           for (int i = numDice; i <= len; i++) {//loop the output
               double perc = counts[i - 1] * 100.0 / N;
               System.out.printf("%10d %10d %10.1f%%\n", i, counts[i - 1], perc);
           }
          
           //asking for user choice to continue
           System.out.print("\nDo you wish to continue?(Y/N) ");
           choice = keybd.nextLine();
           if(choice.equalsIgnoreCase("N"))
               break;//loop end statement
       }
      
       keybd.close();
   }
}

Output