Karel has gotten really into board games lately.
Karel wants to build a checkerboard so that he can play board games with the other dogs.
Write a program that has Karel paint a checkerboard. You can assume that the world will always have 8 rows and 8 columns.
HINT:
Rather than typing out every single move and paint command, think about how you can break this problem down into smaller problems that are repeated.
What functions could you write that would make this problem easier to solve?
// This program has Karel paint a checkerboard with 8 rows and 8 columns.
function main() {
// Karel starts in the bottom left corner of the world
turnLeft();
// Karel will move up the left side of the world
for (var i = 0; i < 8; i++) {
paintRow();
move();
}
// Karel will move to the top right corner of the world
turnRight();
for (var i = 0; i < 8; i++) {
move();
}
// Karel will move down the right side of the world
turnRight();
for (var i = 0; i < 8; i++) {
paintRow();
move();
}
// Karel will move to the bottom left corner of the world
turnLeft();
for (var i = 0; i < 8; i++) {
move();
}
}
// This function has Karel paint a row of alternating black and white squares
function paintRow() {
for (var i = 0; i < 8; i++) {
paintSquare();
move();
}
turnAround();
for (var i = 0; i < 8; i++) {
move();
}
turnAround();
}
// This function has Karel paint a single square
function paintSquare() {
if (isFacingRight()) {
paint();
} else {
turnRight();
paint();
turnLeft();
}
}
they need to add code tags to this site (use markdown?), but in any case this is freaking epic
To create a program that has Karel paint a checkerboard, we can break down the problem into smaller steps:
1. Define a function to make Karel move to the next row.
2. Define a function to make Karel paint one cell.
3. Define a function to make Karel paint an entire row.
4. Define a function to make Karel move to the next row and paint the row.
5. Use the above functions to make Karel paint the entire board.
Here's the step-by-step code in Python:
```python
from karel.stanfordkarel import *
def move_to_next_row():
turn_left()
move()
turn_right()
def paint_cell():
paint_corner(BLUE)
def paint_row():
while front_is_clear():
paint_cell()
move()
move()
paint_cell()
def move_to_next_row_and_paint():
paint_row()
move_to_next_row()
def main():
while front_is_clear():
move_to_next_row_and_paint()
if __name__ == '__main__':
run_karel_program()
```
This program assumes that the `stanfordkarel` library is being used, which provides the Karel functions `turn_left()`, `turn_right()`, `move()`, `paint_corner(color)`, `front_is_clear()`, and `run_karel_program()`.
To write a program that has Karel paint a checkerboard, you can break down the problem into smaller tasks that are repeated. Here's an approach to solving this problem:
1. Define two functions: `paint_square()` and `paint_row()`.
- The `paint_square()` function will be responsible for painting a single square, alternating between two colors.
- The `paint_row()` function will paint a single row and call `paint_square()` alternately for each square.
2. Write the `paint_square()` function:
- Use conditional statements to determine which color to paint the square based on its position (even or odd).
- Use Karel's `paint_corner()` command to paint the square.
The `paint_square()` function could look like this:
```python
def paint_square():
if Karel.position_x % 2 == 0:
Karel.paint_corner(RED)
else:
Karel.paint_corner(BLACK)
```
Note: `Karel.position_x` represents the x-coordinate of Karel's current position.
3. Write the `paint_row()` function:
- Use a loop to repeat the process of painting squares in a row.
- Call the `paint_square()` function inside the loop.
- Move Karel one square forward after each square is painted to advance to the next square in the row.
The `paint_row()` function could be implemented as follows:
```python
def paint_row():
for i in range(8):
paint_square()
Karel.move()
# Turn Karel around to prepare for the next row
Karel.turn_around()
```
4. Write the main program:
- Use a loop to repeat the process of painting rows in the checkerboard.
- Call the `paint_row()` function inside the loop.
- Move Karel one row down after each row is painted.
The main program could be structured like this:
```python
def main():
for i in range(8):
paint_row()
Karel.move_to_next_row()
if __name__ == "__main__":
main()
```
By breaking down the problem into smaller functions, you can make the code more modular and easier to understand. This also allows for better code reuse and maintainability.