pxt-calliope/docs/reference/js/lessons/magic-8/activity.md

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2016-03-26 00:47:20 +01:00
# magic 8 activity
a fortune teller game on the BBC micro:bit #docs
### ~avatar avatar
Welcome! This tutorial will help you create a magic 8 ball on the BBC micro:bit. Let's get started!
### ~
To create a new script, go to the [Create Code](/microbit/create-code) page and tap *New Project* under **Touch Develop**.
Show a string to instruct the user how to play Magic 8! The magic 8 ball can only answer true or false questions.
```
basic.showString("Ask a question", 150)
```
Display the number 8.
```
basic.showString("Ask a question", 150)
basic.showNumber(8, 150)
```
* Run your program
Register code to run when the BBC micro:bit is shaken.
```
basic.showString("Ask a question", 150)
basic.showNumber(8, 150)
input.onGesture(Gesture.Shake, () => {
})
```
Create a variable of type number called **x**.
Set **x** equal to a random number with a limit of 3.
Remember the random function in the math library, picks a random number from 0 to the limit, but not including the limit unless it is 0.
```
basic.showString("Ask a question", 150)
basic.showNumber(8, 150)
input.onGesture(Gesture.Shake, () => {
let x = Math.random(3)
})
```
Create an if statement for the condition `if x= 2`.
If **x** is 2, display the string 'Yes'
```
basic.showString("Ask a question", 150)
basic.showNumber(8, 150)
input.onGesture(Gesture.Shake, () => {
let x1 = Math.random(3)
if (x1 == 2) {
basic.showString("Yes", 150)
}
})
```
Create an if statement for the condition `if x = 1`.
If ``x`` is 1, display the string 'No'
```
basic.showString("Ask a question", 150)
basic.showNumber(8, 150)
input.onGesture(Gesture.Shake, () => {
let x2 = Math.random(3)
if (x2 == 2) {
basic.showString("Yes", 150)
} else if (x2 == 1) {
basic.showString("No", 150)
}
})
```
If **x** is not 2 or 1, it must be 0. This is the else condition.
If **x** is 0, display the string 'I don't know'
Display the number 8 so users know they can ask the magic 8 ball another question!
```
basic.showString("Ask a question", 150)
basic.showNumber(8, 150)
input.onGesture(Gesture.Shake, () => {
basic.clearScreen()
let randomNumber = Math.random(3)
if (randomNumber == 2) {
basic.showString("Yes", 150)
} else if (randomNumber == 1) {
basic.showString("No", 150)
}
else {
basic.showString("I don't know", 150)
}
basic.showNumber(8, 150)
})
```
* Run your program
### ~avatar avatar
Excellent, you're ready to continue with the [challenges](/microbit/lessons/magic-8/challenges)!
### ~