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