pxt-calliope/docs/lessons/rotation-animation/quiz-answers.md

rotation animation quiz answers

Learn how to create a rotating image with a while loop. #image #loop #while #docs

This is the answer key for the rotation animation quiz.

1. What is a "global variable"?

Answers may vary. A global variable is a place where you can store data so that you can use it later in your code.

2. Consider the following directions

Write the code to create a global variable called foo that stores a boolean and initialize it to false.

rotating = true

3. Consider the following code

while (rotating) {
}

Explain what this line of code does.

It is a while loop that will be executed only if the global variable called rotating is true.

4. Consider the following code

basic.showAnimation(`
# . . . . . . # . . . . . . # . . . . .
. # . . . . . # . . . . . # . . . . . .
. . # . . . . # . . . . # . . # # # # #
. . . # . . . # . . . # . . . . . . . .
. . . . # . . # . . # . . . . . . . . .
`, 400)

If the rectangle below represents the BBC micro:bit, shade the areas that will be displayed. Explain why that particular area is shaded.

Show animation will show a series of image frames on the LED screen, pausing the specified time (400 milliseconds) after each frame