In Java, Print Diagonal Sum Of 2D Matrix

 

public class Diagonal{

  public static void printSum(int [][]matrix){

    int primary = 0;

    int secondary = 0;

    for(int r = matrix.length-1, p = matrix[r].length-1, s = 0; 0 <= r; r --, p --, s++){

      primary += matrix[r][p];

      secondary += matrix[r][s];

    }

    System.out.println("Primary diagonal: " + primary);

    System.out.println("Secondary diagonal: " + secondary);

  }

  public static void main(String[]args){

    int [][]given = {

      {2, 33, 4, 1},

      {3, 44, 3, 12},

      {56, 7, 8, 86},

      {5, 2, 4, 21}

    };

    printSum(given);

  }

}