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move lessons out of web site

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will move select lessons back to "educators" section
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Tom Ball
2016-06-14 11:49:58 -04:00
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docs/lessons/rotation-animation/quiz-answers.md
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# rotation animation quiz answers
Learn how to create a rotating image with a while loop.
This is the answer key for the [rotation animation quiz](/lessons/rotation-animation/quiz).
## 1. What is a " variable"?
Answers may vary. A variable is a place where you can store data so that you can use it later in your code.
## 2. Write the code to create a ** variable** called `foo` that stores a boolean and initialize it to **false**.
```blocks
let rotating = true;
```
## 3. Explain what this line of code does.
```blocks
let rotating = true;
while (rotating) {
basic.showLeds(`
. . . . .
. . . . .
. . # . .
. . . . .
. . . . .
`)
basic.showLeds(`
. . . . .
. . . . .
. . . . .
. . . . .
. . . . .
`)
}
```
<br/>
It is a **while** loop that will be executed only if the ** variable** called `rotating` is **true**.
## 4. If the rectangle below represents the BBC micro:bit, shade the areas that will be displayed. Explain why that particular area is shaded.
```blocks
basic.showLeds(`
. . # . .
. . # . .
. . # . .
. . # . .
. . # . .
`)
basic.showLeds(`
. . . . .
. . . . .
# # # # #
. . . . .
. . . . .
`)
basic.showLeds(`
. . . . #
. . . # .
. . # . .
. # . . .
# . . . .
`)
basic.showLeds(`
. . . . #
. . . # .
. . # . .
. # . . .
# . . . .
`)
```
![](/static/mb/lessons/rotation-animation-0.png)
![](/static/mb/lessons/rotation-animation-1.png)
![](/static/mb/lessons/rotation-animation-2.png)
![](/static/mb/lessons/rotation-animation-3.png)
Show animation will show a series of image frames on the LED screen, pausing the specified time (400 milliseconds) after each frame