Question

I have 2D array but if I change x coordinate, everytime I get wrong result.

  int[][] arr = {{0, 2, 0, 0, 1},{0, 2, 0, 0, 1},{0, 2, 0, 0, 1},{0, 2, 0, 0, 1},{0, 2, 0, 0, 1}};
int now, previous;

   for (int i = 1; i < 5; i++) {
    for (int j = 0; j < 5; j++) {
        now = arr[i][j];
        previous = arr[i-1][j];
        }
   }

The result of variable now is 0, 2, 0, 0, 1… Why I want to have only 2, 0, 0, 1
If I change i coordinate of variable for Example i = 1 the output is still 0, 2, 0, 0, 1…
Do you know where is problem?
Thanks

Answer 1

because i corresponds to the outer array in your example. what you have will print 0, 2, 0, 0, 1 four times. I gather what you want is to show 2, 0, 0, 1 five times… for that you should be doing

for (int i = 0; i < 5; i++) {
 for (int j = 1; j < 5; j++) {
     now = arr[i][j];
     previous = arr[i-1][j];
     }
}