Hello world!
I'm talking about using a nested if else
in Alice3.
I've set up a scene with a pixie,
a teapot, a teapot, a coffeemaker,  and a cola bottle.
and I'm going to, initially,
make all of those invisible.
And one way I could do this
would be to select it,
and then under properties
set the opacity to zero.
and you don't see it: I could do that for each of those.
And if we run it, you can see they're all missing.
But if I told Pixie
to turn to face the coffee pot
she would be able to do that because it still
exists in that world even though it's invisible.
What I want to do is have a variable
and it iss going to be going to be Boolean.
And I'm going to call it answer
and give it an initial value of true.
And then I'm going to use a function
and have the pixie get a Boolean from the user.
And for the custom text string,
I'm going to have her say, "Would you like coffee?"
If the answer is true,
and I can just say it answer, because answer
will have a value of true or false.
So, if answer
is true (or answer equal equal true)
and I could also saying that,
but I don't really need to I can just say if answer.
That means if the answer is true,
I'm going to make the coffee visible.
And go back procedures...
and use the code this time,
for the coffeemaker to set the opacity to one.
If this is false, if answer is false,
So the user said they did not want coffee,
I'm going to offer tea.
And so I'm going to
Assign a value to answer
equals, and no matter what I pick here,
I'm going to use that function
to get a value from the user.
[I want the pixie] get Boolean from the user.
And this time for the custom text string
to have her say, "Would you like tea?"
And...
inside this else,
if answer, I'm going to make the teapot visible.
I could copy this to the clipboard,
Copy that to the clipboard,
and then drag the clipboard in
and just change this to the teapot.
And if I ask them, "Do you want coffee?"
and they say true,
then the coffee is visible
And that's the else, in that is true we skip the whole else.
Ok, I asked "Would you like tea?"
And they answer true,
I make the teapot visible.
And if they answer false for both coffee and tea,
I could keep going and ask them
"Would you like soda?"
and keep going with that.
But I'm going to end it for now,
and simply make the cola visible.
Let's do that by copying to the clipboard.
And just change this to the cola bottle.
And maybe the Pixie will say something like...
"Well , here is some soda."
OK, let's run this.
And she says, "Would you like coffee?"
And if I say true,
the coffeemaker becomes visible.
if I say false,
she says, "Would you like tea?"
And if I say true, the teapot becomes visible.
And if I answer false to the coffee,
and false to the tea,
she says, "Well here's some soda."
And that's it!