pxt-calliope/docs/getting-started/coin-flipper.md

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# The amazing coin flipper
### ~avatar avatar
Are you trying to choose whether to play soccer or go to the movies
instead, or which toppings to have on your pizza? Build a coin
flipping machine with the @boardname@ to choose for you!
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### ~
Here are the blocks to make your coin flipper. When you press button
`B`, the coin flipper will show either `H` for heads or `T` for tails
on the LED screen.
```blocks
input.onButtonPressed(Button.B, () => {
if (Math.randomBoolean()) {
basic.showString("H");
} else {
basic.showString("T");
}
});
```
### ~hint
The ``pick random true or false`` block randomly tells the ``if``
block `true` or `false`. If the ``pick`` block picked `true`, the
``if`` block shows the letter `H`. Otherwise, it shows the letter `T`.
That's it!
### ~
### Keeping score
#### ~avatar
To keep track out of how many guesses you've won,
add these blocks to your coin flipper:
#### ~
```blocks
input.onButtonPressed(Button.A, () => {
game.addScore(1);
});
input.onButtonPressed(Button.AB, () => {
basic.showNumber(game.score());
});
```
These blocks mean that if you press button `A`, you will add `1` to
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your score, and if you press `A` and `B` together, the @boardname@ will
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show your score.
When you're done, your coin flipping program should look like this:
```blocks
input.onButtonPressed(Button.B, () => {
if (Math.randomBoolean()) {
basic.showString("H");
} else {
basic.showString("T");
}
});
input.onButtonPressed(Button.A, () => {
game.addScore(1);
});
input.onButtonPressed(Button.AB, () => {
basic.showNumber(game.score());
});
```
Flip until your thumbs get tired!
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### ~button /getting-started/rock-paper-scissors
NEXT: ROCK PAPER SCISSORS
### ~