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

This is the same as what leoflower posted here. I've just changed the variable names for better understanding.

level = denotes the current level of the diagonal that is being printed. Ex:- level = 2 denotes diagonal elements with indices (0,2),(1,1),(2,0)

currDiagRowIndex = denotes row index of the current diagonal being printed

currDiagColIndex = denotes columnn index of the current diagonal being printed

void printMatrixDiagonal(int matrix[][], int endRowIndex, int endColIndex){
    for(int level = 0; level < endColIndex; level++){
        for(int currDiagRowIndex = 0, currDiagColIndex = level; currDiagRowIndex < endRowIndex && currDiagColIndex >= 0 ; currDiagRowIndex++, currDiagColIndex--){
            System.out.print(matrix[currDiagRowIndex][currDiagColIndex] + "  ");
        }
        System.out.println();
    }

    for(int level = 1; level < endRowIndex; level++){
        for(int currDiagRowIndex = level, currDiagColIndex = endColIndex-1; currDiagRowIndex < endRowIndex && currDiagColIndex >= 0; currDiagRowIndex++, currDiagColIndex--){
            System.out.print(matrix[currDiagRowIndex][currDiagColIndex]+ "  ");
        }
        System.out.println();
    }
}

Input:

1 2 3 4 5 
6 7 8 9 10
11 12 13 14 15
16 17 18 19 20
21 22 23 24 25

Output:

1  
2  6  
3  7  11  
4  8  12  16  
5  9  13  17  21  
10  14  18  22  
15  19  23  
20  24  
25