66 lines
1.3 KiB
Markdown
66 lines
1.3 KiB
Markdown
# digi yoyo challenges
|
|
|
|
These challenges will teach you how to create a counter 10 to 1. #docs
|
|
|
|
**Challenge 0**
|
|
|
|
### @video vimeo/134459911
|
|
|
|
[This guided tutorial](/lessons/digi-yoyo/tutorial) will teach you how to make a counter from 0-9 using a while loop.
|
|
|
|
```
|
|
count = 1
|
|
while (count < 10) {
|
|
basic.pause(1000)
|
|
basic.showNumber(count, 150)
|
|
count = count + 1
|
|
}
|
|
```
|
|
|
|
**Challenge 1**
|
|
|
|
How about we create a counter that counts backwards from 10 to 1? Let's add a while loop that executes only when `count` is greater than 0.
|
|
|
|
```
|
|
count = 1
|
|
while (count < 10) {
|
|
basic.pause(1000)
|
|
basic.showNumber(count, 150)
|
|
count = count + 1
|
|
}
|
|
while (count > 0) {
|
|
}
|
|
```
|
|
|
|
**Challenge 2**
|
|
|
|
Inside of the while loop, let's add `pause->(1000)` so that we have a pause between each number as it's counting down. Also, let's show `count`!
|
|
|
|
```
|
|
count = 1
|
|
while (count < 10) {
|
|
basic.pause(1000)
|
|
basic.showNumber(count, 150)
|
|
count = count + 1
|
|
}
|
|
while (count > 0) {
|
|
basic.pause(1000) // ***
|
|
basic.showNumber(count, 150) // ***
|
|
}
|
|
```
|
|
|
|
* Run the code to see if it works as expected.
|
|
|
|
**Challenge 3**
|
|
|
|
### @video vimeo/134449661
|
|
|
|
Now, we need `count` to decrease by one after the micro:bit has displayed the value of `count`.
|
|
|
|
We can do this by adding this line:
|
|
|
|
```
|
|
count = count - 1
|
|
```
|
|
|