Java - Taking a 2-D array and returning the sum of the rows of that array using a 1-D array

Question

I'm trying to write a method that takes a two-dimensional array of integers (t) and returns a one-dimensional array (sums) that holds the sum of all the elements for a particular row WITHOUT using arithmetic operators and using a for-each loop.

public static int sumArr(int[] m) { // Returns the sum of a row of a 1-D arr
        int sum = 0;
        for (int number : m) {
            sum = sum + number;
        }
        return sum;
    }

This is a separate method that returns the sum of a row within a 1-D array. As you can see, I use a for-each, however; I need to implicate this method in order to do the above task.

the sum of all the elements for a particular row WITHOUT using arithmetic operators - how would you calculate the sum without addition operator? — Eran
– Eran, Commented Mar 19, 2018 at 19:03
Use an explicit Iterator if you should not use a for-each loop — Thiyagu
– Thiyagu, Commented Mar 19, 2018 at 19:06

Jean Logeart · Accepted Answer · 2018-03-19 19:06:09Z

1

Simply:

int[][] t = ...
int[] sums = new int[t.length];
int i = 0;
for (int[] row : t) {
   sums[i++] = sumArray(row);
}

answered Mar 19, 2018 at 19:06

Jean Logeart

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