Division by 0 (zero) in an App

[Bob Frazee]

Hi Cyrille;
Well, I tried your above suggestion.
App Name: HeatIndex
Inside App: EXPORT Heatindex()
Go to home screen
Select: Toolbox, then App, then HeatIndex->HeatIndex
I now have HeatIndex on the command line
I hit Enter. App does not start. All it does is shift HeatIndex above the command line and displays 0.0000
It does the same thing if I use HeatIndex().
It also does the same thing if I take the divide by 0 out of the App.

Am I doing something wrong?