Practice›Java Fundamentals›Module 5. Arrays & Lists›5.4 2D arrays

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5.4 2D arrays — diagonal total

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Task

Fill in diagonalSum so that it returns the sum of the main diagonal — the elements where the row number equals the column number.

For the 3×3 grid the diagonal is 1, 5, 9, so the program prints 15. One loop is enough, not two.

Your solution

public class Main {

    public static int diagonalSum(int[][] g) {
        // add up the elements where the row equals the column

    }

    public static void main(String[] args) {
        int[][] g = {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}};
        System.out.println(diagonalSum(g));
    }
}

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