9.1.6 Checkerboard V1 Codehs Fixed

# Pass this function a list of lists to print it as a grid def print_board ( board ): for i in range(len(board)): print( " " .join([str(x) for x in board[i]])) # 1. Start with an empty board and fill it with 0s board = [] for i in range( 8 ): board.append([ 0 ] * 8 ) # 2. Use nested loops to change 0s to 1s in the correct rows for i in range( 8 ): for j in range( 8 ): # Top 3 rows (0, 1, 2) and bottom 3 rows (5, 6, 7) if i < 3 or i > 4 : board[i][j] = 1 # 3. Print the final result print_board(board) Use code with caution. Copied to clipboard

To solve this, you need to understand two fundamental concepts:

Core observation: parity (even/odd) of row+column determines which symbol to place.

The 9.1.6 Checkerboard V1 CodeHS is an engaging and challenging project that offers a wealth of learning opportunities for coders of all levels. By completing this project, users develop essential skills in game development, programming fundamentals, and problem-solving. Whether you're a seasoned developer or just starting out, the 9.1.6 Checkerboard V1 is an excellent way to enhance your coding skills and unlock new possibilities in the world of app development and game design. 9.1.6 checkerboard v1 codehs

// Constants for the checkerboard layout var NUM_ROWS = 8; var NUM_COLS = 8; var COLOR_ONE = Color.red; var COLOR_TWO = Color.black; function start() // Calculate size dynamically based on canvas width var squareSize = getWidth() / NUM_COLS; // Outer loop iterates through each row for (var r = 0; r < NUM_ROWS; r++) // Inner loop iterates through each column in the current row for (var c = 0; c < NUM_COLS; c++) // Create the square geometry var square = new Rectangle(squareSize, squareSize); // Calculate the X and Y screen positions var xPos = c * squareSize; var yPos = r * squareSize; square.setPosition(xPos, yPos); // Check if the sum of row and column is even or odd to alternate colors if ((r + c) % 2 === 0) square.setColor(COLOR_ONE); else square.setColor(COLOR_TWO); // Render the square to the canvas add(square); Use code with caution. Code Step-by-Step Breakdown

for row in range(8): # Loop for each row (0-7) new_row = [] # Create an empty list for the current row for col in range(8): # Loop for each column (0-7) # Step 3: Determine if this cell should be a 1 or a 0 if row < 3 or row > 4: new_row.append(1) # Top 3 or bottom 3 rows get a 1 else: new_row.append(0) # Middle 2 rows get a 0 # Step 4: Add the completed row to the board board.append(new_row)

for row from 0 to 7: for col from 0 to 7: x = col * square_size y = row * square_size if (row + col) % 2 == 0: color = RED else: color = BLACK draw square at (x, y) with size square_size, fill color # Pass this function a list of lists

// Constants for the grid setup var NUM_ROWS = 8; var NUM_COLS = 8; // Colors used for the checkerboard var COLOR_ONE = Color.black; var COLOR_TWO = Color.red; function start() // Calculate size dynamically based on canvas width var squareSize = getWidth() / NUM_COLS; // Outer loop iterates through each row for (var r = 0; r < NUM_ROWS; r++) // Inner loop iterates through each column in that row for (var c = 0; c < NUM_COLS; c++) // Calculate coordinates for the current square var xPos = c * squareSize; var yPos = r * squareSize; // Create the square graphic object var square = new Rectangle(squareSize, squareSize); square.setPosition(xPos, yPos); // Determine color based on row + column parity if ((r + c) % 2 === 0) square.setColor(COLOR_ONE); else square.setColor(COLOR_TWO); // Add the completed square to the canvas add(square); Use code with caution. Code Breakdown and Explanations The Setup and Constants

If you are a CodeHS teacher, you have access to excellent resources to help your students succeed.

The is less about "drawing" and more about coordinate math . Once you master the (row + col) % 2 trick, you can generate patterns for much more complex grid-based games and visualizations. Print the final result print_board(board) Use code with

Here is the standard JavaScript / Canvas implementation used in the CodeHS Karel/Graphics environment: javascript

The "9.1.6 Checkerboard, v1" exercise, found in CodeHS courses like "Georgia Foundations of Artificial Intelligence" and "WCSD Python II", is the first step in a three-part project. The ultimate goal is to build a program that stores numbers representing checkers pieces on a board. In this initial version, you are tasked with creating the basic board structure in the form of a .

This code creates the simple, solid-row board described in the problem.

: Avoid using explicit pixel numbers like 50 for the square size. If the canvas size changes, your board will break. Stick to the dynamic SQUARE_SIZE constant. To help adapt this to your project, could you let me know:

var SQUARES_PER_ROW = 8; var squareSize = getWidth() / SQUARES_PER_ROW; Use code with caution. 2. Nested Loops for the Grid