51 lines
1.3 KiB
Markdown
51 lines
1.3 KiB
Markdown
# speed button quiz answers
|
|
|
|
counter that keeps track of how many times button "A" has been pressed #LED #screen #variables #docs #input
|
|
|
|
This is the answer key for the [speed button quiz](/microbit/lessons/speed-button/quiz).
|
|
|
|
## 1. What is a variable?
|
|
|
|
<br/>
|
|
|
|
A variable that is available throughout your main function.
|
|
|
|
## 2. If the rectangle below represents the BBC micro:bit, shade the area that shows the value of the variable count.
|
|
|
|
```blocks
|
|
let count = 0
|
|
```
|
|
|
|
|
|
|
|
## 3. If the rectangle below represents the BBC micro:bit, shade the areas that will be displayed after two button presses on Button A. Explain why that particular area is shaded.
|
|
|
|
```blocks
|
|
let count_ = 0
|
|
input.onButtonPressed(Button.A, () => {
|
|
count_ = count_ + 1
|
|
basic.showNumber(count_, 100)
|
|
})
|
|
```
|
|
|
|
<br/>
|
|
|
|
|
|
|
|
After two button presses, **count** will be equal to 2.
|
|
|
|
## 5. If the rectangle below represents the BBC micro:bit, shade the areas that will be displayed after five button presses on Button A. Explain why that particular area is shaded.
|
|
|
|
```blocks
|
|
count_ = 0
|
|
input.onButtonPressed(Button.A, () => {
|
|
count_ = count_ + 1
|
|
basic.showNumber(count_, 100)
|
|
})
|
|
```
|
|
|
|
|
|
|
|
After five button presses, **count** will be equal to 5.
|
|
|