The following code can draw an O:

    yertle.up( )
    yertle.goto(-50, -70)
    yertle.down( )
    yertle.circle(20)

You should use the following template for your program:

#Program: drawXorO.py
#Include your program prologue here
from turtle import Pen as Turtle

yertle = Turtle( )

def drawX( ):
	#Write your code to draw an X here


def drawO( ):
	#Write your code to draw an O here
	
#Start the main program here
#Ask the user if they would like to draw an X or an O
#If they type X, call the drawX( ) function.
#If they type O, call the drawO( ) function.

The following is a sample output of the program:
Sample output 1:

Do you want to draw and X or an O? X

Problem 2: Once you have saved and printed out your program for problem 1, save it under a new name, e.g. drawXorOposition.py. Modify the two functions so that they now each take two parameters, a row number and a column number. The functions should now draw the X or the O at the position given by the row and column numbers (imagine 3 rows and 3 columns as in a tic-tac-toe game). You can have the turtle draw the X or O in a different place by changing the goto( ) command in each function.

For the drawX(row,col) function, change the goto( ) line to read:

yertle.goto(-70+col*50, -30+row*50)

For the drawO(row, col) function, change the goto( ) line to read:

yertle.goto(-50 + col*50, -70 + row*50)

Thus, as you increase the row number by 1, the position of the drawn X or O will shift up by 50 pixels. As you increase the column number by 1, the position of the drawn X or O will shift right by 50 pixels.

Now modify your main program to ask the user whether they want to draw an X or an O and what row and column they would like to draw it in. The program should then call the appropriate function, based on the user's answer, to draw the X or O in the appropriate place.

You may use the following program template:

#Program: drawXorOposition.py
#Include your program prologue here

from turtle import Pen as Turtle

yertle = Turtle( )

def drawX(row, col):
	#Write your code to draw an X here


def drawO(row, col):
	#Write your code to draw an O here
	
#Start the main program here
#Ask the user if they would like to draw an X or an O
#Ask the user to enter the row number
#Ask the user to enter the column number
#If they type X, call the drawX( ) function 
#	to draw an X in the correct row and column position.
#If they type O, call the drawO( ) function 
#	to draw an O in the correct row and column position.

The following are sample outputs of the program:
Sample output 1:

Do you want to draw and X or an O? O
Enter the row number: 0
Enter the column number: 2

Sample output 2:

Do you want to draw and X or an O? X
Enter the row number: 2
Enter the column number: 1

What To Turn In.

Reminder.

Be sure to save a copy of each program on your P:\ drive.