9.1.7 Checkerboard V2 Codehs [top]

Let's break down the solution for a basic 8x8 board.

# This is the logic for the checkerboard pattern: # If the sum of the row and column indices is even, make it red. # Otherwise, make it black. if (row + col) % 2 == 0: pen.color("red") else: pen.color("black")

If you want to write this more concisely (though CodeHS might prefer the loop method for grading), you can use a : board = [[(i + j + 1) % 2 for j in range(8)] for i in range(8)] If you'd like, I can help you: Debug your specific error message Explain how to change the grid size dynamically

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Depending on your specific language track in CodeHS (typically Java or JavaScript), you will implement nested for loops to traverse the matrix. 1. Initialize the Loops

function setup() createCanvas(400, 400); background(255);

// Set the size of the checkerboard var squareSize = 50; var rows = 8; var cols = 8; Let's break down the solution for a basic 8x8 board

s where the numbers alternate in a checkerboard pattern. The key is to use nested loops modulus operator ) to determine if a specific cell should be a based on its row and column indices. The Core Logic

def print_board(board): for i in range(len(board)): print(" ".join([str(x) for x in board[i]]))

Create a checkerboard pattern of squares in a graphics window using nested loops. Each square is the same size; squares alternate color (e.g., black and white). The pattern should form an N-by-N grid (commonly 8×8), and the top-left square’s color should follow the specification (typically black). if (row + col) % 2 == 0: pen

Translate the logic into Python code. Use a for loop to iterate through each row's index. Inside, for each row, convert each number to a string and join them with spaces before printing.

: Each square's x position is col * SQUARE_SIZE and its y position is row * SQUARE_SIZE . The Code Solution (JavaScript/karel) javascript

This approach is fine for an 8x8 board, but what if you needed a 12x12 board? That's a lot of repetitive code. A better, more professional approach is to write a function that can build a checkerboard of any size.

In CodeHS graphics (using the GraphicsProgram or Turtle ), you will use add(new Rectangle(x, y, width, height)) or similar methods.

// Move to next line after each row System.out.println();