When rolling three dice, the possible outcomes for the total of a roll range fro

Question

When rolling three dice, the possible outcomes for the total of a roll range from 3 to 18. That is three dice all showing one dot to all showing six dots. The distribution of the roll outcomes can be simulated by rolling the dice many times. Write a Java program that performs that simulation. Prompt the user to enter the number of rolls to simulate and then report how many of each total was rolled. A sample run of the program might appear as follows: Enter the number of rolls to simulate: 5000 The total number of 3s is: 437 The total number of 4s is: 621 The total number of 18s is: 421

Explanation / Answer

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

public class DiceSimulation {

   /**
   * @param args
   */
   public static void main(String[] args) {
       // TODO Auto-generated method stub
       Scanner scan = new Scanner(System.in);
      
       Random rand = new Random();
       int count[] = new int[19];
       for(int i=0;i<19;i++)
       {
           count[i]=0;
       }
       System.out.print("Enter the number of rolls to simulate:");
      
       int r = scan.nextInt();
      
       for(int i=0;i<r;i++)
       {
           int tmp = rand.nextInt(6)+1+rand.nextInt(6)+1+rand.nextInt(6)+1;
           count[tmp]++;
       }
       for(int i=3;i<19;i++)
       {
           System.out.println("The total number of "+i+"s is:"+count[i]);
       }

   }

}

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