Please explain the While x do y command

[Rena]

I am trying to use this command in CRW8. This is an example of the code I have written:
While starthour >= 24 Do
startdate := startdate + 1;
starthour := starthour - 24;
Exit While;
When I try to save this I get the following error:
'exit while' without an enclosing 'while' loop

The on-line help doesn't offer much help in how to write this. Can anybody give me some tips on this command?

Thanks!

 

[MalcolmW]

I'm not sure you need to use a While...Do for this, but
NumberVar starthour ;
NumberVar startdate ;
While starthour >= 24 Do
(
startdate := startdate + 1 ;
starthour := starthour - 24 ;
) ;
starthour

Alternatively,
NumberVar starthour ;
NumberVar startdate ;
If starthour >= 24 then
(
startdate := startdate + 1 ;
starthour := starthour - 24 ;
)
Else
starthour