Question

1-Create a one-dimensional array of 99 double values. Then, use a for loop to add a random number from 0 to 100 to each element in the array. To do that, use the random method of the Math class to get a double value between 0.0 and 1.0 and multiply it by 100

like this

Math.random() * 100

2-Use an enhanced for loop to sum the values in the array. Then, calculate the average value and print that value on the console like this

Average: 50.9526671843517

3-Use the sort method of the Arrays class to sort the values in the array, and print the median value (the 50th value) on the console

like this

Median:    52.18369291650803
-Print the 9th value of the array on the console and every 9th value after that.

like this

position:    9         8.927702403161032

position:    18       14.0531287498060076

...

position:   99      22.471670293184822

Answer 1

Hi, Please find my implementation.

Please let me know in case of any issue.

import java.util.Arrays;

public class DoubleRandom {

  

   public static void main(String[] args) {

      

       // creating array

       double[] arr = new double[99];

      

       for(int i=0; i<99; i++){

           arr[i] = Math.random() * 100;

       }

      

       double sum = 0;

       for(double d : arr){

           sum += d;

       }

      

       System.out.println("Average : "+sum/99.0);

      

       Arrays.sort(arr);

      

       System.out.println("Median: "+arr[49]); // 50th value

      

       int index = 8; // 9th value index

       while(index < 99){

           System.out.println("position: "+(index+ 1)+" "+arr[index]);

           index = index + 9;

       }

   }

}

/*

Sample run:

Average : 49.75761742464862

Median: 49.962842815728436

position: 9 8.766757546030624

position: 18 17.262110835701115

position: 27 20.865192789633745

position: 36 29.89303631952237

position: 45 43.084534673882814

position: 54 55.62839129243991

position: 63 66.13908523713565

position: 72 77.36692081739585

position: 81 83.77114421253107

position: 90 88.62289971975

position: 99 99.78514216085563

*/