If you're working through the CodeHS Java course (or similar), you've likely encountered the 9.1.7 Checkerboard V2 exercise. It builds on the basic checkerboard concept but adds constraints that force you to think carefully about loops, conditionals, and drawing order.
The core of this challenge lies in understanding how to access specific elements in a list of lists and applying a mathematical condition to alternate values. The Core Logic: The Modulo Operator
for (var row = 0; row < GRID_SIZE; row++) for (var col = 0; col < GRID_SIZE; col++) // Drawing logic goes here Use code with caution. 3. Applying Conditional Logic 9.1.7 Checkerboard V2 Codehs
The program correctly generates a checkerboard pattern by iterating through a 2D grid and setting the color of each cell based on the parity of the sum of its row and column indices.
Bad Code:
After the loops have finished building your board, you must print it row by row. Using print " ".join(row)
for (var row = 0; row < NUM_ROWS; row++) for (var col = 0; col < NUM_COLS; col++) // Logic for coloring goes here Use code with caution. Copied to clipboard 3. Apply the parity logic Mastering Checkerboard V2 in CodeHS: A Step-by-Step Guide
To further develop their skills, students can explore variations and extensions of the Checkerboard V2 project:
Let’s assume the following constants (typical in CodeHS): The Core Logic: The Modulo Operator for (var