1. Re: Short Circuiting + Return in procedures
On Thu, 25 Jun 1998, Terry Constant wrote:
> to jump to the next iteration of a loop without having to go through the
> rest of the code before getting to the end of the loop.
>
> For example,
>
> for i = 1 to 1000 do
> if s[i] is not what I am looking for then
> loop
> end if
Reverse your logic and it is done:
for index = start to finish by step do
if data[index] = what_you_want then -- note '=' rather than '!='
exit
end if
end for
:)
As for the argument over exit, return and abort(), each is a stronger
version of the previous.
For instance, in the above for-loop, the exit causes the for-loop to drop
what it is doing and run the code following it.
If the "exit" is replaced by a "return", the subroutine (I assume, this
time, that it is *in* a subroutine) will drop what it is doing and run the
code following the subroutine call.
If the "exit" is replaced by an "abort()", the *whole program* drops what
it is doing and returns to the OS.
Hence the need for different code in each situation. If "exit" was the
only keyword, then it becomes ambigiuous...
Carl
PS Yes, I've used QBasic. IK that EXIT FUNCTION is used, but the syntax
for returning a value is horrible.
--
Carl R White
E-mail...: cyrek- at -bigfoot.com / Remove the hyphens before
Finger...: crwhite- at -dcsun1.comp.brad.ac.uk \ mailing or fingering...
Url......: http://www.bigfoot.com/~cyrek/
