+- Forum (https://www.boriel.com/forum)
+-- Forum: Compilers and Computer Languages (https://www.boriel.com/forum/forumdisplay.php?fid=12)
+--- Forum: ZX Basic Compiler (https://www.boriel.com/forum/forumdisplay.php?fid=11)
+---- Forum: Wishlist (https://www.boriel.com/forum/forumdisplay.php?fid=14)
+---- Thread: Exit from more than one level (/showthread.php?tid=2623)
Exit from more than one level - Zoran - 04-18-2025
Sometimes we need exit not only from innermost loop, but also from some outer loop (sometimes more than two levels).
As a workaround I use "do" in the outer loop and "while 1" in the inner, just to be able to use "exit do" or "exit while":
Code:
do
' some code
while 1
' some code
if somecondition then
exit do ' exit from two levels
end if
' some code...
if someothercondition then
exit while ' exit inner loop only
end if
' some code...
end while
' some code...
loopWhen exit from more than two levels is needed, there is no other way but to put a label and use "goto". It would be much more elegant if we could exit from more levels directly. For example, "exit do do" or "exit do do do" would exit from two or three levels of "do". I'm not sure that "exit for for for" or "exit while while" is needed; supporting "do" loop only is probably quite enough -- "do" loop is the most powerful and you can easily write any loop as a "do" loop.
What do you think?
RE: Exit from more than one level - boriel - 04-21-2025
That's a common problem in most languages indeed. This feature is not yet implemented.
Will keep you posted.
RE: Exit from more than one level - Zoran - 04-21-2025
boriel Wrote:That's a common problem in most languages indeed. This feature is not yet implemented.
Will keep you posted.
Thank you!
RE: Exit from more than one level - Duefectu - 04-23-2025
GOTO is our friend in some cases!!!