MOD, ODD() in Program

[Angus]

hi!

I'm struggling with a program and need help from the forum. Current Problem is a piece of code like that:

Code:


EXPORT FILT(N,L)
BEGIN
  IF (N MOD 2) = 1 THEN 
    MSGBOX("Odd Core Length required.");
    RETURN "";
  END;
  (...)

My Questions are:
- how would I check Integer Operations like ODD(), MOD,.. for an Input Variable? I get an "Error:Bad Argument Value". Maybe a real to integer cast would do the job. Is that possible?
- Is Typing of Input Variables and local Variables free to choose or do I have to stick to some nomenclature like with home/cas Variables and Command Variants? That is a big issue which still confuses me. Must admit that.
- When I start a program via Shift+Program instead of Toolbox/User I get a dialog with the program's Parameters. Is that totally equal to the toolbox launch? I mean there are no data left in any Variable after the program finishes independent of how I started the program?

Thanks