Question

This is for JAVA programming.

Create a test class that contains two arrays and two methods:
- The first array has 3 rows and 3 columns and is initialized with type double data
- The second array has 4 rows and 4 columns and is also initialized with type double data
- The first method ArraysRows will receive an array of type double as an argument and then print out the sum and average of all elements in each ROW. Do NOT pass any other parameters into the method except for the array.
- The second method ArrayColumns will receive an array of type double as an argument and then print out the sum and average of all elements in each COLUMN. Do NOT pass any other parameters into the method except for the array.
- Array1 = {{5.0, 4.0, 3.0}, {6.0, 4.0, 5.0}, {2.0, 3.0, 4.0}}
- Array2 = {{5.0, 4.0, 3.0, 4.0}, {6.0, 4.0, 5.0, 5.0}, {2.0, 3.0, 4.0, 3.0}, {1.0, 2.0, 3.0, 2.0}}
Do NOT code any numerical literals into your code.

Answer 1

public class TestArrays {
   public static void main(String[] args) {
       double[][] Array1 = { { 5.0, 4.0, 3.0 }, { 6.0, 4.0, 5.0 }, { 2.0, 3.0, 4.0 } };
       double[][] Array2 = { { 5.0, 4.0, 3.0, 4.0 }, { 6.0, 4.0, 5.0, 5.0 }, { 2.0, 3.0, 4.0, 3.0 },
               { 1.0, 2.0, 3.0, 2.0 } };
       ArraysRows(Array1);
       System.out.println();
       System.out.println();
       ArraysColumns(Array2);

   }

   private static void ArraysRows(double[][] arr) {
       for (int i = 0; i < arr.length; i++) {
           double sum = 0;
           for (int j = 0; j < arr[i].length; j++) {
               sum += arr[i][j];
           }
           System.out.println("Sum of Row" + i + ": " + sum);
           System.out.println("Averagae of Row" + i + ": " + (sum / arr[i].length));
       }
   }

   private static void ArraysColumns(double[][] arr) {
       for (int i = 0; i < arr[0].length; i++) {
           double sum = 0;
           for (int j = 0; j < arr.length; j++) {
               sum += arr[j][i];
           }
           System.out.println("Sum of Col" + i + ": " + sum);
           System.out.println("Averagae of Col" + i + ": " + (sum / arr.length));
       }
   }
}