Loop diagonally through two dimensional array

Question

I wrote the following code to walk half the diagonals of an array:

String[][] b = [a,b,c]
               [d,e,f]
               [g,h,i];  

public void LoopD         


        

Answer 1

As Alex mentioned here, you need to look into indices in the loop. The following is how I approached this problem.

Input:         
a b c    ----- (0,0) (0,1) (0,2)
d e f    ----- (1,0) (1,1) (1,2)
g h i    ----- (2,0) (2,1) (2,2)

Output:
a        ----- (0,0)
b d      ----- (0,1) (1,0)
c e g    ----- (0,2) (1,1) (2,0)
f h      ----- (1,2) (2,1)
i        ----- (2,2)

public class PrintDiagonal{

    public static void printDR(String[][] matrix, int rows, int cols){
        for(int c=0; c < cols; c++){
            for(int i=0, j=c; i< rows && j>=0;i++,j--){
                System.out.print(matrix[i][j] +" ");
             }
             System.out.println();
        }

        for(int r =1; r < rows; r++){
            for(int i =r, j= cols -1; i=0; i++,j--){
                System.out.print(matrix[i][j] + " ");
            }
            System.out.println();
        }
    }
    public static void main(String[] args){
        String[][] matrix ={
            {"a","b","c"},
            {"d","e","f"},
            {"g","h","i"}
        };

        int rows = matrix.length;
        int columns = matrix[0].length; 
        printDR(matrix ,rows, columns);
    }
}