Traversing 2D Arrays

AP Computer Science A· difficulty 4/5

To process a 2D array <code> int[][] grid </code> row by row, the standard nested loop is

A
$Single loop using grid[0].length only$
B
$for(int c=0; c<grid[0].length; c++) for(int r=0; r<grid.length; r++) grid[r][c] = ...$
C
$for(int r=0; r<grid.length; r++) for(int c=0; c<grid[r].length; c++) grid[r][c] = ...$
check_circle
D
$Single loop using grid.length only$

Explanation

Outer loop iterates rows (grid.length), inner iterates columns in that row (grid[r].length, allowing jagged arrays). Choice (B) is column-major traversal, also valid for square arrays.

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