# pong quiz answers create the game Pong. ## Name ## Directions Use this activity document to guide your work in the [pong tutorial](/lessons/pong/tutorial) Answer the questions while completing the tutorial. Pay attention to the dialogues! ## 1. Create two variables that will keep track of the x-position and y-position of the ball, and assign the variables to their initial values. <br/> ``` ballX = 2 ballY = 1 ``` ## 2. Create two variables that keeps track of the velocity (or the speed and direction) of the ball, and assign the variables to their initial values. <br/> ``` ballXVelocity = 1 ballYVelocity = 1 ``` ## 3. Write the code that plots the initial position of the paddle and the ball. <br/> ``` led.plot(0, paddleY) led.plot(ballX, ballY) ``` ## 4. Write the code that moves the paddle up when Button A is pressed. (Don't worry about setting 'game running' to true.) <br/> ``` input.onButtonPressed(Button.A, () => { if (paddleNotUp()) { led.unplot(0, paddleY) paddleY = paddleY - 1 led.plot(0, paddleY) } }) ``` ## 5. Write the code that moves the paddle up when Button B is pressed. (Don't worry about setting 'game running' to true.) <br/> ``` input.onButtonPressed(Button.A, () => { if (paddleNotDown()) { led.unplot(0, paddleY) paddleY = paddleY + 1 led.plot(0, paddleY) } }) ``` ## 6. Write the code to update the y-velocity. (Hint: look at the function "update y velocity".) <br/> ``` if (ballY == 4 || ballY == 0) { ballYVelocity = (-1) * ballYVelocity } ``` ## 7. Write the code to move the ball. (Hint: look at the function "move ball".) <br/> ``` led.unplot(ballX, ballY) ballX = ballX + ballXVelocity ballY = ballY + ballYVelocity ```