Question

Write a java program that simulates the rolling of four

dice. The program should use random number generator to roll dice. The

sum of the four values should then be calculated. Note that each die can

show an integer value from 1 to 6, so the sum of the four values will vary from 4 to 24, with 14 being the most frequent sum and 4 and 24 being the

least frequent sums. Your program should roll the dice 12,960 times. Use an

one dimensional array to tally the numbers of times each possible sum

appears. Print the result on console in tabular format. Check the totals are

reasonable. As an example, there are 6 ways to roll a 7, so approximately

1/6 of all the rolls should be 7

Answer 1

public class Roll4Dice {

   public static void main(String[] args) {
       int [] sumOfRolls = new int[21];
       int dice1,dice2,dice3,dice4;
       for (int i=0;i<12960;i++) {
           dice1=1 +(int)(Math.random()*6);
           dice2=1 +(int)(Math.random()*6);
           dice3=1 +(int)(Math.random()*6);
           dice4=1 +(int)(Math.random()*6);
           sumOfRolls[dice1+dice2+dice3+dice4-4]+=1;
       }
       System.out.printf("Sum of rolls        Frequency ");
       for(int i=4;i<25;i++) {
           System.out.printf("    %3d            %7d ",i,sumOfRolls[i-4]);
       }

   }

}