How to structure this program?

Hi,
I am writing a console program in Pascal. It needs to ask the user for a date, and then submit this date to 8 other pascal programs that have already been written. These 8 other programs then do their own thing with the date (create files etc.)
I was wondering what the best way to structure this would be?

Should I copy all 8 original PAS files into my new file? This could potentially get very messy, as each of the PAS files has variables and constants etc, and if I did it this way wouldn't I have to combine all the variables in one area, and make sure that no two variables have the same name etc etc. I'm not even sure if this is possible really.

Is there an easy way so that each original program retains its own 'space' and be completely separate from the other modules, while still being able to access about 10 lines of code at the beginning of the new program?

I'm using the Free Pascal compiler.

Thanks!

If the other programs are written in Pascal, each program would start with something like this:


All you have to do is convert it to:

Note the change from "end." to "end;" in the last line and we renamed "program" to "procedure"

Now you can call these procedures from your main program. Since you've made the variables all declared within a procedure, they are scoped to the procedure and its descendants and will not conflict with variables in other procedures.

Thanks very much Scorpions4eva!

I will go and do that right now.