Learn how to create a counter with the micro:bit button.

This is the answer key for the counter quiz.

## 1. What is a variable?

Answers may vary but a variable is a place where you can store and retrieve data

## 2. Draw the stored value for the variable called count

``let count = 0`` We create a variable, `count` to keep track of the current count. The number 0 is stored into memory of the variable.

## 3. Draw which LEDs are ON after running this code and pressing button “A” once. Explain you chose to draw that number

``````let count = 0
input.onButtonPressed(Button.A, () => {
count = count + 1
basic.showNumber(count)
})`````` We are only pressing on button pressed once. So the number to display on the micro:bit is also one.

## 4. Draw which LEDs are ON after running this code and pressing button “A” three times. Explain you chose to draw that number

``````let count = 0
input.onButtonPressed(Button.A, () => {
count =  + 1
basic.showNumber(count)
})`````` We included the code `on button pressed("A")` that runs each time the user presses A. The code increments `count` by `1`. We increase `count` by 1 whenever the user presses the button. So the third time the A button is pressed on the micro:bit, the number 3 is displayed