alice-teacher Major flaw in Alice 2

[Donald Slater]

This is interesting and thank you for bringing this to our attention… I am unable to recreate this at the moment… Would it be possible to send to me directly (dslater at cmu.edu <mailto:dslater at cmu.edu>) a copy of the world where this has happened?

What version of Alice, computer OS, you are using?

Thank you,
Don Slater


> On Feb 12, 2017, at 9:16 PM, robert durtschi via alice-teachers <alice-teachers at lists.andrew.cmu.edu> wrote:
> 
> Rare but annoying when it happens.
> We are doing an Alice world where we are using events to control a seaplane.  There is no need for anything but events, so for a change I immediately deleted 'my first method' from "when the world starts" and changed the event to "while the world is running, during: seaplane move forward 1 meter. 
> Later in the exercise we added a speed control:
>     create a Seaplane properties variable called "speed"
>     replace the 1 meter in "seaplane move forward 1 meter" with "speed meters"
>     choose two "when a key is pressed" 'A' and 'D' to "increment speed by 1" (Accelerate) and "decrement speed by 1" (Decelerate). 
>     We needed a guard check to keep speed from going negative: "if speed > 0" decrement speed by 1
> 
> That's when I realized that the 'universal' commands at the bottom of the edit window, including the if/else had disappeared along with the edit window for the "my first method" I created a method long enough to get the if/else back then deleted it again.
> 
> Bob Durtschi
> 
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