pxt-calliope/docs/reference/js/lessons/rotating-animation/quiz.md

# rotating animation quiz

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

## Name

## Directions

Use this activity document to guide your work in the [rotating animation tutorial](/js/tutorials/rotating-animation).

Answer the questions below while working on or after you finish the tutorial. Pay attention to the dialogs!

## 1. What is a while loop?

## 2. Consider the following directions

Write the code to create a **global variable** called `rotating` and initialize it to **true**.

## 3. Consider the following directions

Write the code to create 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 rectangles below represents a board that is 5 LEDs wide and 5 LEDs tall, place an X approximately where the LED is lighted in the series. Explain why the LED is lighted there.

![](/static/mb/empty-microbit.png)![](/static/mb/empty-microbit.png)![](/static/mb/empty-microbit.png)![](/static/mb/empty-microbit.png)

******************************

## ANSWER KEY

## Directions

Answer the questions below while working on or after you finish the tutorial.

## 2. Consider the following directions

Write the line of code to create a **global variable** called `rotating` and initialize it to **true**.

```
rotating = true
```

## 3. Consider the following directions

Write the line of code that create a **while** loop that will be executed only if the **global variable** called `rotating` is **true**.

```
while (rotating) {
}
```

## 4. Consider the following code

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

If the rectangles below represents a board that is 5 LEDs wide and 5 LEDs tall, place an X approximately where the LED is lighted in the series. Explain why the LED is lighted there.