Codehs - 9.1.6 Checkerboard V1

Use the modulus operator (%) to create the "every other" effect. A reliable trick is checking if (i + j) % 2 == 0 .

// Constants for the checkerboard dimensions var NUM_ROWS = 8; var NUM_COLS = 8; var SQUARE_SIZE = getWidth() / NUM_COLS; function start() drawCheckerboard(); // Main function to orchestrate drawing the grid function drawCheckerboard() for (var row = 0; row < NUM_ROWS; row++) for (var col = 0; col < NUM_COLS; col++) // Calculate coordinates for the current square var x = col * SQUARE_SIZE; var y = row * SQUARE_SIZE; // Create the square graphic object var square = new Rect(SQUARE_SIZE, SQUARE_SIZE); square.setPosition(x, y); // Apply alternating colors based on grid math if ((row + col) % 2 === 0) square.setColor(Color.RED); else square.setColor(Color.BLACK); // Render the square to the screen add(square); Use code with caution. Step-by-Step Code Explanation

. This specific version focuses on the foundational step of creating a 2D structure where values represent different game states: for a checker piece and for an empty square. The Assignment Objective The goal is to create an

The ( col ) tracks horizontal progression. For every single row , the inner loop runs completely from column 0 to column 7. Combined, they execute exactly 64 times (

// Nested loops to iterate through the 2D array for(int row = 0; row < size; row++) 9.1.6 checkerboard v1 codehs

: Use a helper method or another nested loop to print the grid so it looks like a board. Sample Code Structure (Java)

Do you need to use instead of standard red/black?

Is your print_board function printing the modified board variable? If you'd like, I can:

In CodeHS V1, you are often working with a Grid object. Remember that grid.set(row, col, value) is the standard syntax. If your specific assignment uses or Graphics , you would replace grid.set with putBall() or new Rect() , but the nested loop logic remains identical. Common Pitfalls Use the modulus operator (%) to create the

function main() while (leftIsClear()) fillRow(); repositionToNextRow(); // Fill the very last row fillRow(); // Fills a row with the checkerboard pattern function fillRow() while (frontIsClear()) putBeeper(); if (frontIsClear()) move(); if (frontIsClear()) move(); putBeeper(); // Moves Karel up and aligns to the next row function repositionToNextRow() if (facingEast()) if (leftIsClear()) turnLeft(); move(); turnLeft(); else if (rightIsClear()) turnRight(); move(); turnRight(); // Helper to turn right function turnRight() turnLeft(); turnLeft(); turnLeft(); Use code with caution. 4. Detailed Explanation of the Code main() Function

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This is the most efficient way to handle alternating patterns in programming.

Combining the steps above, here is the complete, functional code to solve the challenge on CodeHS, according to user discussions on Reddit : This specific version focuses on the foundational step

Do you need help adapting this code for a like Python or Java?

else if (col % 2 == 0) putBeeper();

Test the program on different world sizes: