Question

28:19 stion Write a Java method that takes a one dimensional array of doubles as a parameter. The method returns the absolute difference between the sum of numbers lower than the value in the middle of the array and the sum of numbers higher or equal to the middle value. Write a program to test your method. Note: When the array length is even the middle value is the average of the two values in the middle. Use the following arrays to test your program: Case #1, the length of array is odd: [8.5 32.8 27.2 19.1 6.5 17.6 24.2 23.1 20.6 13.2 28.4 14.7 18.6), for this case your program should output: 29.30 Case #2, length of array is even: [8.5 32.8 6.2 19.1 15.5 17.6 12.2 3.2 28.4 14.7), for this case your program should output: 37.60 File to upload must be java file Maximum size for new files: 100MB, maximum attachments: 1
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Answer 1

AnsweR:

Explanation:

Here is the method abs_diff which takes a double array, first stores the middle value in a variable named middle.

Then using a for loop, separately stores the sum of elements greater or equal to middle and the elements less than middle.

Then the absolute difference of those variables are returned from teh method.

also checked with both the cases.

Code:

public class Main
{
public static double abs_diff(double a[])
{
double middle;
if(a.length % 2==0)
{
middle= (a[a.length/2] + a[(a.length/2)-1])/2.0;
}
else
{
middle = a[a.length/2];
}
  
double sum_lower = 0, sum_higher = 0;
  
for(int i=0; i<a.length; i++)
{
if(a[i]<middle)
{
sum_lower = sum_lower + a[i];
}
else
{
sum_higher = sum_higher + a[i];
}
}
  
return Math.abs(sum_higher - sum_lower);
  
}
   public static void main(String[] args) {
  
   double a[] = {8.5, 32.8, 27.2, 19.1, 6.5, 17.6, 24.2, 23.1, 20.6, 13.2, 28.4, 14.7, 18.6};
     
   System.out.printf("%.2f\n", abs_diff(a));
     
   double b[] = {8.5, 32.8, 6.2, 19.1, 15.5, 17.6, 12.2, 3.2, 28.4, 14.7};
     
   System.out.printf("%.2f", abs_diff(b));
   }
}

Output:

29.30 37.60 ... Program finished with exit code 0 Press ENTER to exit console. I

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