Question

Write a method that takes in a two-dimensional array of integers, do some calculation for each row in the two-dimensional array, and returns a one-dimensional array of sums for each row. Your code must work any array dimensions, including jagged arrays. The calculations are: • Sum of each row • Maximum value of each row • Minimum value of each row • Average of each row Here is an example an array passed and returns an array of sums for each row.

Sample array passed in: { { 3, 0, 7, 9 },

{ 2, 1, 0, 1 }

, { 9, 3, 4, 6 } };

IN java

Answer 1

public class TwoDimensionalArrayOperations {
   public static void main(String[] args) {
       int arr[][] = { { 3, 0, 7, 9 },

               { 2, 1, 0, 1 }

               , { 9, 3, 4, 6 } };
       int sumOfRow[] = getSumOfRow(arr);
       int maxOfRow[] = getMaxOfRow(arr);
       int minOfRow[] = getMinOfRow(arr);
       for (int i = 0; i < arr.length; i++) {
           for (int j = 0; j < arr[i].length; j++)
               System.out.print(arr[i][j] + " ");
           System.out.println();
       }
       System.out.println("Sum of rows: ");
       for(int i=0;i<sumOfRow.length;i++)
           System.out.print(sumOfRow[i]+" ");
       System.out.println("\nAverage of rows: ");
       for(int i=0;i<sumOfRow.length;i++)
           System.out.print(sumOfRow[i]/(double)arr[i].length);
      
       System.out.println("\nMax of rows: ");
       for(int i=0;i<maxOfRow.length;i++)
           System.out.print(maxOfRow[i]+" ");
       System.out.println("\nMin of rows: ");
       for(int i=0;i<minOfRow.length;i++)
           System.out.print(minOfRow[i]+" ");
      
   }

   private static int[] getSumOfRow(int[][] arr) {
       int res[] = new int[arr.length];
       for (int i = 0; i < arr.length; i++) {
           int sum = 0;
           for (int j = 0; j < arr[i].length; j++)
               sum = sum + arr[i][j];
           res[i] = sum;
       }
       return res;
   }

   private static int[] getMaxOfRow(int[][] arr) {
       int res[] = new int[arr.length];
       for (int i = 0; i < arr.length; i++) {
           int m = arr[i][0];
           for (int j = 0; j < arr[i].length; j++) {
               if (m < arr[i][j])
                   m = arr[i][j];
           }
           res[i] = m;
       }
       return res;
   }

   private static int[] getMinOfRow(int[][] arr) {
       int res[] = new int[arr.length];
       for (int i = 0; i < arr.length; i++) {
           int m = arr[i][0];
           for (int j = 0; j < arr[i].length; j++) {
               if (m > arr[i][j])
                   m = arr[i][j];
           }
           res[i] = m;
       }
       return res;
   }
}

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