Re: problems with the scoping in eu4
- Posted by jaygade Jan 07, 2011
- 2108 views
integer r=5 while r do integer i=0 printf(1,"%d, ",i) i+=1 r-=1 end while
Bill raise a strong point here.
What's the point of beeing able to declare a variable inside a loop construct if its value is reset at each loop cycle?
It would be better to forbid variable declaration inside loop as it was in version 3.x
It is what I suggest concerning variables declarations: a rollback to the situation of version 3.x
And I very like the
exit when condition
this could be added to euphoria 4.x
Jacques
Do this:
if condition then exit end if
for i = 1 to 10 do puts(1,sprintf("%d, ",2*i) end for ... for i = 1 to 20 do .. <= error
I agree that this shouldn't be an error. It never was in the past, has it become an error now?
integer r = 4 while r > 0 do integer i = 0 puts(1,sprintf("%d, ",i) i += 1 r -= 1 end while
prints: 0, 0, 0, 0
while r > 0 with entry do integer i = 0 puts(1,sprintf("%d, ",i) r -= 1 entry i += 1 <= at runtime i has no value end while
I see your point with regards to the first one. This should probably be coded as follows: (untested)
while r > 0 with entry do integer i puts(1, sprintf("%d, ",i) r -= 1 entry if object(i) = 0 then i = 0 -- test and initialize end if i += 1 end while
Although the test does kind of break the utility of "with entry". Maybe there's an even better way of coding that?
Heh - could you do this?
i += object(i)
Probably not. 
3 while with entry seems quite unnecessay given exit (using ada loop, end loop & exit when).
sequence ret = {} loop from = find_from (x, source, from) exit when from = 0 ret &= from from += 1 end loop
Enough people wanted "with entry" so the devs added it. Enough people found it clearer than using a do loop. And entry works with do loops as well. To each their own.
