OpenEuphoria

Re: Interrupting & later completing a program

• Posted by irv mullins <irvm at ellijay.com> Jul 13, 2004
• 622 views

Alex Caracatsanis wrote:

> The exact algorithm isn't important here. Let's say the user answers 3
> questions, quits,
> then returns tomorrow to complete the remaining questions and get the answer.
> How would
> I code a DOS program to achieve that? I'm guessing I'll need to write the
> answers to
> a data file to be opened for update later. How would the program "know" where
> the user
> left off last time, so that it could continue from that point later on?

Alex:

Think first about how you're going to store the answers. Perhaps a simple 
sequence, using 0 for 'no' and 1 for 'yes'. If the user had answered 3 
questions, your sequence would look like: {1,0,1}

Write that to disk.

Your question-asking routine could be a function which would take 
a single parameter (which_question) and display that question, returning 
a '1' or '0' depending upon what the user replied. (Perhaps -1 if the 
user wants to quit)

Read in the saved sequence from disk, look at the length (3 in this case),
and then start up again from there. If s is the sequence read from disk:

integer ans
for x = length(s)+1 to MAX_QUESTIONS do
   ans = ask(x)
   if ans = -1 then print(fn,s) exit 
   else s &= ans
   end if
end for

Regards,
Irv