AP® Computer Science A glossary
Column-major order
Also called: column by column
Course: AP® Computer Science A Shows up in: Unit 4: Data Collections
A 2D array traversal that moves down each column, top to bottom, before moving to the next column.
Appears in the course and exam description (CED): 4.12.A.1
In column-major order the outer loop chooses a column (c < arr[0].length) and the inner loop visits every row (r < arr.length). The element is still written arr[r][c]; only the loop order changes.
Example
for (int c = 0; c < grid[0].length; c++)
{
for (int r = 0; r < grid.length; r++)
{
System.out.print(grid[r][c] + " ");
}
}